Publications
Journal
Articles
J1. Z. Luo, J.
Liu, and H. Lee, “A high-efficiency 40.68-MHz single-stage
dual-output regulating rectifier with ZVS and synchronous PFM control for
wireless powering,” IEEE Journal of Solid-State Circuits (JSSC), accepted for publication.
J2. C. Chen, J.
Liu, and H. Lee, “Dual-path hybrid Dickson converter for
high-ratio conversions in point-of-load applications,” IEEE
Transactions on Industry Applications (TIA), vol. 59,
no. 6, pp. 6914 – 6925, Dec. 2023.
J3. Z. Luo, J. Liu, and H. Lee,
“A 40.68MHz active rectifier with cycle-based on-/off-delay compensation
for high-current biomedical implants,” IEEE Journal of Solid-State
Circuits (JSSC), vol. 58, no. 2, pp. 345 – 356, Feb. 2023.
J4. Q. Cheng, J. Liu, and H. Lee,
“A wide-input-range low-profile adaptive delay compensated hysteretic LED
driver with enhanced current accuracy,” IEEE Journal of Solid-State
Circuits (JSSC), vol. 57, no. 8, pp. 2474 – 2485, Aug. 2022.
J5. Q. Cheng, L. Cong, and H. Lee,
“A 48V-to-80V input 2MHz adaptive ZVT-assisted bus converter with
light-load efficiency improvement,” IEEE Journal of Solid-State
Circuits (JSSC), vol. 57, no. 7, pp. 2196 – 2207, Jul. 2022.
J6. J. Xiong, J. Liu, and H. Lee,
“A continuous-time sigma-delta modulator with continuous-time delay based
integrator,” IEEE Transactions on
Circuits and Systems II: Express Briefs (TCAS-II), vol. 69, no. 3, pp. 914 –
918, Mar. 2022.
J7. W. Han and H. Lee, “A
340nA-quiescent 80mA-load 0.02fs-FOM active-capacitor-based low-dropout
regulator in standard 0.18mm
CMOS,” IEEE Solid-State Circuits Letters (SSC-L), vol. 4,
pp. 125 – 128, Jul. 2021.
J8. S. Uprety and H. Lee, “A
0.65mW-to-1W photovoltaic energy harvester with irradiance-aware
auto-configurable hybrid MPPT achieving >95% MPPT efficiency and 2.9ms FOCV
transient time,” IEEE Journal of Solid-State Circuits (JSSC),
vol. 56, no. 6, pp. 1827 – 1836, Jun. 2021.
J9. Z. Hua, Q. Cheng, J. Liu, and H. Lee,
“A 1.2A dual-output SC DC-DC regulator with continuous gate-drive
modulation achieving ≤0.01mV/mA cross regulation,” IEEE Journal
of Solid-State Circuits (JSSC), vol. 56, no. 5, pp. 1576 –
1587, May 2021.
J10. C. Chen, J. Liu, and H. Lee,
“A 2MHz 9 – 45V input 3-switch ZVS step-up / -down hybrid
converter,” IEEE Journal of Solid-State Circuits (JSSC),
vol. 56, no. 3, pp. 855 – 865, Mar. 2021. (Invited)
J11. S. Prakash, H. Martinez-Garcia, M. H.
Naderi, H. Lee, and J. Silva-Martinez, “An agile supply modulator
with improved transient performance for power-efficient linear amplifier
employing envelope tracking techniques,” IEEE Transactions on Power
Electronics (TPEL), vol. 35, no. 4, pp. 4178 – 4191, Apr.
2020.
J12. L. Cong and H. Lee, “A 1
– 2MHz 150 – 400V GaN-based isolated DC-DC bus converter with
monolithic slope-sensing ZVS detection,” IEEE Journal of Solid-State Circuits (JSSC), vol. 53, no. 12, pp. 3434 – 3445, Dec.
2018. (Invited)
J13. L. Cong, J. Liu, and H. Lee,
“A high-efficiency low-profile zero-voltage-transition synchronous
non-inverting buck-boost converter with auxiliary component sharing,” IEEE Transactions on Circuits and Systems I:
Regular Papers (TCAS-I), vol. 66, no. 1, pp. 438 – 449, Jan.
2019.
J14. Z. Liu and H. Lee, “A
current-accuracy-enhanced wide-input-range DC-DC LED driver with feedforward
synchronous current control,” IEEE
Transactions on Circuits and Systems I: Regular Papers (TCAS-I),
vol. 65, no. 11, pp. 3996 – 4006, Nov. 2018.
J15. J. Xue and H. Lee, “A 2MHz
12V - 100V 90%-efficiency self-balancing ZVS reconfigurable three-level DC-DC
regulator with constant-frequency adaptive-on-time V2 control and
nanosecond-scale ZVS turn-on delay,” IEEE Journal of Solid-State Circuits (JSSC), vol. 51, no. 12,
pp. 2854 – 2866, Dec. 2016. (Invited)
J16. S. Uprety and H. Lee, “A
0.4W – 21W fast-transient global-search algorithm based integrated
photovoltaic energy harvester with 99% GMPPT efficiency and 94% power
efficiency,” IEEE Journal
of Solid-State Circuits (JSSC), vol. 51, no. 9, pp. 2153 –
2167, Sep. 2016.
J17. Z. Liu and H. Lee, “A
wide-input-range efficiency-enhanced synchronous LED driver with adaptive
resonant timing control,” IEEE Journal of Solid-State Circuits (JSSC), vol. 51, no. 8,
pp. 1810 – 1825, Aug. 2016. (Invited)
J18. L. Cong and H. Lee,
“High-voltage high-frequency non-isolated multi-phase DC-DC converters
with passive-saving two-phase QSW-ZVS technique,” Journal of Analog
Integrated Circuits and Signal Processing (JAICSP), vol. 88, no. 2, pp. 303 – 317, Aug.
2016. (Invited)
J19. H. Lee, “An auto-reconfigurable 2x/4x AC-DC regulator for
wirelessly-powered biomedical implants with 28% link efficiency
enhancement,” IEEE Transactions on
Very Large Scale Integration Systems (TVLSI), vol. 24, no. 4, pp.
1598 – 1602, Apr. 2016.
J20. Z. Liu and H. Lee, “A 26W
97%-efficiency fast-settling dimmable LED driver with dual-nMOS-sensing based
glitch-tolerant synchronous current control for high-brightness solid-state
lighting applications,” IEEE
Journal of Solid-State Circuits (JSSC),
vol. 50, no. 9, pp. 2174 – 2187, Sep. 2015.
J21. J. Xue and H. Lee, “A 2MHz
60W zero-voltage switching synchronous non-inverting buck-boost converter with
reduced component values,” IEEE
Transactions on Circuits and Systems II: Express Briefs (TCAS-II),
vol. 62, no. 7, pp. 716 – 720, Jul. 2015.
J22. Z. Liu, L. Cong, and H. Lee,
“Design of on-chip gate drivers with power-efficient high-speed level
shifting and dynamic timing control for high-voltage synchronous switching
power converters,” IEEE Journal of
Solid-State Circuits (JSSC),
vol. 50, no. 6, pp. 1463 – 1477, Jun. 2015.
J23. J. Xue and H. Lee,
“Enabling high-frequency high-efficiency non-isolated boost converters
with quasi-square-wave zero-voltage switching and on-chip dynamic dead-time
controlled synchronous gate drive,” IEEE
Transactions on Power Electronics (TPEL), vol. 30, no. 12, pp. 6817
– 6828, Dec. 2015.
J24. H. Lee, Z. Hua, and X. Zhang, “A reconfigurable
2x/2.5x/3x/4x SC DC-DC regulator with fixed on-time control for transcutaneous
power transmission,” IEEE
Transactions on Very Large Scale Integration Systems (TVLSI), vol.
23, no. 4, pp. 712 – 722, Apr. 2015.
J25. Z. Hua and H. Lee, “A
reconfigurable dual-output switched-capacitor DC-DC regulator with sub-harmonic
adaptive-on-time control for low-power applications,” IEEE Journal of Solid-State Circuits (JSSC), vol. 50, no. 3,
pp. 724 – 736, Mar. 2015.
J26. Z. Liu and H. Lee, “Design
of high-performance integrated dimmable LED driver for high-brightness
solid-state lighting applications,” Journal
of Analog Integrated Circuits and Signal Processing (JAICSP), vol.
82, no. 3, pp. 519 – 532, Mar. 2015. (Invited)
J27. D. Park and H. Lee,
“Improvements in light-load efficiency and operation frequency for
low-voltage current-mode integrated boost converters,” IEEE Transactions on Circuits and Systems
II: Express Briefs (TCAS-II), vol. 61, no. 8, pp. 599 – 603,
Aug. 2014.
J28. D. Park, Z. Liu, and H. Lee,
“A 40V 10W 93%-efficiency current-accuracy-enhanced dimmable LED driver
with adaptive timing difference compensation for solid-state lighting
applications,” IEEE Journal of
Solid-State Circuits (JSSC),
vol. 49, no. 8, pp. 1848 – 1860, Aug. 2014. (Invited)
J29. X. Yu, J. Liu, B. Payne, M. Morgan, and H.
Lee, “A 5Gb/s automatic sub-bit between-pair skew compensator for
parallel data communication in 0.13mm CMOS,” IEEE Transactions on Very Large Scale Integration Systems (TVLSI),
vol. 21, no. 12, pp. 2274 – 2285, Dec. 2013.
J30. X. Zhang and H. Lee,
“Gain-enhanced monolithic charge pump with simultaneous dynamic gate and
substrate control,” IEEE
Transactions on Very Large Scale Integration Systems (TVLSI), vol.
21, no. 3, pp. 593 – 596, Mar. 2013.
J31. Y. Li, J. Liu, and H. Lee,
“Ground switching load modulation with ground isolation for passive HF
RFID transponders,” IEEE
Transactions on Very Large Scale Integration Systems (TVLSI), vol.
20, no. 8, pp. 1443 – 1452, Aug. 2012.
J32. D. Kim, V. Gopalakrishna, S. Guo, H.
Lee, M. Torlak, N. Kehtamavaz, A. Lobo, and P. Loizou, “On the design
of a flexible stimulator for animal studies in auditory prostheses,” Biomedical Signal Processing and Control (BSPC),
vol. 6, no. 4, pp. 346 – 355, Oct. 2011.
J33. M. Du, H. Lee, and J. Liu,
“A 5-MHz 91% peak-power-efficiency buck regulator with auto-selectable
peak- and valley-current control,” IEEE
Journal of Solid-State Circuits (JSSC),
vol. 46, no. 8, pp. 1928 – 1939, Aug. 2011. (Invited)
J34. S. Guo and H. Lee, “Dual
active-capacitive-feedback compensation for low-power large-capacitive-load
three-stage amplifiers,” IEEE
Journal of Solid-State Circuits (JSSC),
vol. 46, no. 2, pp. 452 – 464, Feb. 2011.
J35. M. Al-Shyoukh and H. Lee,
“A compact fully-integrated extremum-selector-based soft-start circuit
for voltage regulators,” IEEE
Transactions on Circuits and Systems II: Express Briefs (TCAS-II),
vol. 57, no. 10, pp. 818 – 822, Oct. 2010.
J36. X. Zhang and H. Lee, “An
efficiency-enhanced auto-reconfigurable 2x/3x SC charge pump for transcutaneous
power transmission,” IEEE Journal
of Solid-State Circuits (JSSC),
vol. 45, no. 9, pp. 1906 – 1922, Sep. 2010.
J37. M. Du and H. Lee, “An
integrated speed- and accuracy-enhanced CMOS current sensor with
dynamically-biased shunt feedback for current-mode buck regulators,” IEEE Transactions on Circuits and Systems I:
Regular Papers (TCAS-I), vol. 57, no. 10, pp. 2804 – 2814,
Oct. 2010.
J38. H. Lee and S. Ryu, “An efficiency-enhanced DCM buck
regulator with improved switching timing of power transistors,” IEEE Transactions on Circuits and
Systems II: Express Briefs (TCAS-II), vol. 57, no. 3, pp. 238
– 242, Mar. 2010.
J39. J. Yao, J. Liu, and H. Lee,
“Bulk voltage trimming offset calibration for high-speed Flash
ADCs,” IEEE Transactions on
Circuits and Systems II: Express Briefs (TCAS-II), vol. 57, no. 2,
pp. 110 – 114, Feb. 2010.
J40. S. Guo and H. Lee,
“Single-capacitor active-feedback compensation for small-capacitive-load
three-stage amplifiers,” IEEE
Transactions on Circuits and Systems II: Express Briefs (TCAS-II),
vol. 56, no. 10, pp. 758 – 762, Oct. 2009.
J41. M. Al-Shyoukh and H. Lee,
“A compact ramp-based soft-start circuit for voltage regulators,” IEEE Transactions on Circuits and
Systems II: Express Briefs (TCAS-II), vol. 56, no. 7, pp. 535
– 539, Jul. 2009.
J42. S. Guo and H. Lee, “An
efficiency-enhanced CMOS rectifier with unbalanced-biased comparators for
transcutaneous-powered high-current implants,” IEEE Journal of Solid-State Circuits (JSSC), vol. 44, no. 6, pp. 1796 – 1804, Jun.
2009.
J43. M. Al-Shyoukh, H. Lee, and R.
Perez, “A transient-enhanced low-quiescent current low-dropout regulator
with buffer impedance attenuation,” IEEE
Journal of Solid-State Circuits (JSSC),
vol. 42, no. 8, pp. 1732 – 1742, Aug. 2007. (Invited)
J44. H. Lee and P. K. T. Mok, “An SC voltage doubler with
pseudo-continuous output regulation using a three-stage switchable
opamp,” IEEE Journal of Solid-State
Circuits (JSSC),
vol. 42, no. 6, pp. 1216 – 1229, Jun. 2007.
J45. X. F. Lin, J. Liu, H. Lee, and H.
Liu, “A 2.5- to 3.5-Gb/s adaptive FIR equalizer with continuous-time wide
bandwidth delay line in 0.25mm
CMOS,” IEEE Journal of Solid-State
Circuits (JSSC), vol.
41, no. 8, pp. 1908 – 1918, Aug. 2006. (Invited)
J46. H. Lee, P. K. T. Mok, and K. N. Leung, “Design of low-power
analog driver based on slew-rate-enhancement circuit for CMOS low-dropout
regulators,” IEEE Transactions on Circuits and Systems II: Express
Briefs (TCAS-II), vol. 52, no. 9, pp. 563 – 567, Sep. 2005.
J47. H. Lee and P. K. T. Mok, “Switching noise and shoot-through
current reduction techniques for switched-capacitor voltage doubler,” IEEE
Journal of Solid-State Circuits (JSSC), vol. 40, no. 5, pp. 1136
– 1146, May 2005.
J48. H. Lee and P. K. T. Mok, “Advances in active-feedback
frequency compensation with power optimization and transient
improvement,” IEEE Transactions on Circuits and Systems I: Regular
Papers (TCAS-I), vol. 51, no. 9, pp. 1690 – 1696, Sep. 2004.
J49. H. Lee, K. N. Leung, and P. K. T. Mok, “A dual-path
bandwidth extension amplifier topology with dual-loop parallel
compensation,” IEEE Journal of Solid-State Circuits (JSSC),
vol. 38, no. 10, pp. 1739 – 1744, Oct. 2003.
J50. H. Lee and P. K. T. Mok, “Active-feedback
frequency-compensation technique for low-power multistage amplifiers,” IEEE
Journal of Solid-State Circuits (JSSC), vol. 38, no. 3, pp. 511
– 520, Mar. 2003. (Invited)
Conference
Articles
C1.
Z. Luo, J. Liu, and H. Lee, “A 90%-efficiency 40.68MHz single-stage dual-output
regulating rectifier with ZVS and synchronous PFM control for wireless
powering,” in IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers, San Francisco, CA, Feb.
2023, pp. 454 – 455.
C2.
W.
Han, C. Chen, J. Liu, and H. Lee, “An 80A 48V-input
capacitor-assisted dual-inductor hybrid Dickson converter for large-conversion
ratio applications,” in Proc. IEEE Energy Conversion Congress
and Exposition (ECCE), Detroit, MI, USA, Oct. 2022, pp. 1 – 4.
C3.
J. Xiong, J. Zhao, J. Liu, and H. Lee, “A 3rd order
CT-SD modulator
with a hybrid loop filter employing passive and continuous-time delay-based
integrators,” in Proc. IEEE International Symposium on Circuits
and Systems (ISCAS), Austin, TX, May 2022, pp. 1230 – 1233.
C4.
W. Han, Z. Luo, C. Chen, J. Liu, and H. Lee, “A 200mA-load 0.62fs-FOM
active-capacitor-assisted dual-loop output capacitorless low-dropout regulator
in standard 65nm CMOS,” in Proc. IEEE International Symposium
on Circuits and Systems (ISCAS), Austin, TX, May 2022, pp. 1906
– 1909.
C5.
C.
Chen, J. Liu, and H. Lee, “A 2.5 – 5MHz 87% peak efficiency
48V-to-1V integrated hybrid DC-DC converter adopting ladder SC network with
capacitor-assisted dual inductor filtering,” in IEEE International
Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers, San
Francisco, CA, Feb. 2022, pp. 234 – 235.
C6.
C.
Chen, J. Liu, and H. Lee, “A 2 – 5MHz multiple DC output
hybrid boost converter with scalable CR boosting scheme achieving 91%
efficiency at a conversion ratio of 12,” in IEEE International
Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers, San
Francisco, CA, Feb. 2022, pp. 310 – 311.
C7.
W.
Han, Q. Chen, C. Chen, and H. Lee, “Conductive EMI reduction
techniques for soft-switched half-bridge buck converters in automotive
applications,” in Proc. IEEE
Applied Power Electronics Conference (APEC), Houston, TX, USA, Mar.
2022, pp. 646 – 649.
C8.
Z.
Luo and H. Lee, “A 87.2%-efficiency 27.12MHz current-mode wireless
power receiver with ramp-assisted energy delivery controller for implantable
devices,” in Proc. IEEE Asian Solid-State Circuits Conference (A-SSCC),
Nov. 2021, pp. 1 – 3.
C9.
Z.
Luo and H. Lee, “A 40.68MHz active rectifier with cycle-based
on/off-delay compensation for biomedical implants,” in Proc. IEEE
47th European Solid-State Circuits Conference (ESSCIRC),
Sep. 2021, pp. 227 – 230.
C10. C. Chen, J. Liu, and H. Lee,
“A 92.7%-efficiency 30A 48V-to-1V dual-path hybrid Dickson converter for
PoL applications,” in Proc. IEEE Energy Conversion Congress and
Exposition (ECCE), Oct. 2021, pp. 1989 – 1994.
C11. Q. Cheng, J. Liu, and H. Lee,
“A 5 – 100V input low-profile adaptive delay compensated hysteretic
LED driver with enhanced current accuracy,” in Proc. IEEE
Custom Integrated Circuits Conference (CICC), Apr. 2021, pp. 1
– 2. (Nominated for Best Student Paper Award)
C12. C. Chen, J. Liu, and H. Lee,
“A 9 – 45V input 2MHz 3-switch ZVS step-up / -down hybrid converter
with 5x volume reduction,” in Proc. IEEE Custom Integrated Circuits
Conference (CICC), Mar. 2020, pp. 1 - 4. (Nominated for Best Student Paper
Award)
C13. Q. Cheng, L. Cong, and H. Lee,
“A 48-to-80V input 2MHz adaptive ZVT-assisted GaN-based bus converter
achieving 14% light-load efficiency enhancement,” in IEEE
International Solid-State Circuits Conference (ISSCC) Dig.
Tech. Papers, San Francisco, CA, USA, Feb. 2020, pp. 196 – 197.
C14. Z. Hua and H. Lee, “Ratio
extension technique for Ladder- / Dickson-based multiple-output
switched-capacitor DC-DC converters,” in Proc. IEEE International
Midwest Symposium on Circuits and Systems (MWSCAS), Dallas, TX, USA,
Aug. 2019, pp. 933 – 936.
C15. S. Zhang, M. Zhao, and H. Lee,
“A current-density-enhanced 12V-to-1.2V/10A, AOT controlled, 4-phase
series-capacitor buck converter with embedded current balancing,” in Proc.
IEEE International Midwest Symposium on Circuits and Systems (MWSCAS),
Dallas, TX, USA, Aug. 2019, pp. 802 – 805.
C16. L. Cong and H. Lee, “A 2MHz
150-400V input isolated DC-DC bus converter with monolithic slope-sensing ZVS
detection achieving 13ns turn-on delay and 1.6W power saving,” in IEEE
International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers,
San Francisco, CA, USA, Feb. 2018, pp. 382 – 383.
C17. Q. Cheng and H. Lee, “A
high-frequency non-isolated ZVS synchronous buck-boost LED driver with fully
integrated dynamic dead-time controlled gate drive,” in Proc. IEEE Applied Power Electronics Conference (APEC), San
Antonio, TX, USA, Mar. 2018, pp. 419 – 422.
C18. L. Cong and H. Lee, “A 150V
monolithic synchronous gate driver with built-in ZVS detection for half-bridge
converters,” in Proc. IEEE Applied Power Electronics Conference (APEC),
San Antonio, TX, USA, Mar. 2018, pp. 1861 – 1864.
C19. Z. Hua and H. Lee, “A 1.2A
auto-configurable dual-output switched-capacitor DC-DC regulator with
continuous gate-drive modulation achieving ≤0.01mV/mA cross
regulation,” in Proc. IEEE
Custom Integrated Circuits Conference (CICC), Austin, TX, USA, May
2017, pp. 1 – 4.
C20. S. Uprety and H. Lee, “A
93%-power-efficiency photovoltaic energy harvester with irradiance-aware
auto-reconfigurable MPPT scheme achieving >95% MPPT efficiency across
650µW to 1W and 2.9ms FOCV MPPT transient time,” in IEEE
International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers,
San Francisco, CA, USA, Feb. 2017, pp. 378 – 379.
C21. Z. Hua and H. Lee, “Design
of area-efficient multiple-output switched-capacitor DC-DC converters,”
in Proc. IEEE Applied Power Electronics Conference (APEC), Tampa, FL,
USA, Mar. 2017, pp. 2217 – 2221.
C22. J. Xue and H. Lee, “A 2MHz
12 – 100V 90%-efficiency self-balancing ZVS three-level DC-DC regulator
with constant-frequency AOT V2 control and 5ns ZVS turn-on
delay,” in IEEE International
Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers, San
Francisco, CA, USA, Feb. 2016, pp. 226 – 227.
C23. Z. Liu and H. Lee, “A 5
– 115V efficiency-enhanced synchronous LED driver with adaptive resonant
timing control,” IEEE Custom
Integrated Circuits Conference (CICC), San Jose, CA, USA, Sep. 2015,
pp. 1 – 4.
C24. L. Cong and H. Lee, “A 110
– 250V 2MHz isolated DC-DC converter with integrated high-speed
synchronous three-level gate drive,” in Proc. IEEE Energy Conversion
Congress and Exposition (ECCE), Montreal, Canada, Sep. 2015, pp.
1479 – 1484.
C25. H. Lee and T. Duryea, “A low-cost closed-form transient
model for area-efficient on-chip power MOS sizing and reliable inductive load
switching,” in Proc. IEEE Energy Conversion Congress and
Exposition (ECCE), Montreal, Canada, Sep. 2015, pp. 2112 –
2115.
C26. J. Xue, L. Cong, and H. Lee,
“A high-efficiency high-frequency GaN-based three-level isolated DC-DC
converter with dynamic dead-time controlled synchronous gate drive,” 17th SRC Annual TECHCON Conference,
Austin, TX, USA, Mar. 2015, (4 pages). (Best in Session Award)
C27. J. Xue, L. Cong, and H. Lee,
“A 100-V 2-MHz isolated QSW-ZVS three-level DC-DC converter with on-chip
dynamic dead-time controlled synchronous gate driver for eGaN power
FETs,” in Proc. IEEE Applied Power
Electronics Conference (APEC), Charlotte, NC, USA, Mar. 2015, pp.
451 – 454.
C28. L. Cong, J. Xue, and H. Lee,
“A 100-V reconfigurable synchronous gate driver with comparator-based
dynamic dead-time control for high-voltage high-frequency DC-DC
converters,” in Proc. IEEE Applied Power Electronics Conference (APEC),
Charlotte, NC, USA, Mar. 2015, pp. 2007 – 2010.
C29. Z. Hua and H. Lee,
“Adaptive-on-time control technique for output ripple reduction and
light-load efficiency enhancement in low-power switched-capacitor DC-DC
regulators,” in Proc. IEEE Applied Power Electronics Conference (APEC),
Charlotte, NC, USA, Mar. 2015, pp 1930 – 1933.
C30. Z. Liu, J. Xue, L. Cong, and H. Lee,
“Building high-frequency high-voltage switching converters for renewable
energy systems,” in Proc. IEEE
International Midwest Symposium on Circuits and Systems (MWSCAS),
College Station, TX, USA, Aug. 2014, pp. 346 – 349.
C31. L. Cong, J. Xue, and H. Lee,
“A 140W 97% 4MHz two-phase buck converter with quasi-square-wave ZVS
scheme,” in Proc. IEEE
International Midwest Symposium on Circuits and Systems (MWSCAS),
College Station, TX, USA, Aug. 2014, pp. 769 – 772.
C32. S. Uprety and H. Lee, “A
43V 400mW – 21W global-search-based photovoltaic energy harvester with
350us transient time, 99.9% MPPT efficiency and 94% power efficiency,” in
IEEE International Solid-State Circuits
Conference Dig. Tech. Papers (ISSCC), San Francisco, CA, USA, Feb.
2014, pp. 404 – 405.
C33. J. Xue, L. Cong, and H. Lee,
“A 130W 95%-efficiency 1MHz non-isolated boost converter using PWM
zero-voltage switching and enhancement-mode GaN FETs,” in Proc. IEEE Applied Power Electronics
Conference (APEC), Fort Worth, TX, USA, Mar. 2014, pp. 471 –
475.
C34. Z. Liu and H. Lee, “A 25W
97%-efficiency 3.5MHz integrated dimmable LED driver with lossless synchronous
current control and floating nMOS sensing scheme,” in Proc. IEEE Applied Power Electronics
Conference (APEC), Fort Worth, TX, USA, Mar. 2014, pp. 1378 –
1383.
C35. Z. Liu and H. Lee, “A 100V
gate driver with sub-nanosecond-delay level shifting and dynamic dead-time
control for ZVS-based synchronous power converters,” in Proc. IEEE Custom Integrated Circuits
Conference (CICC), San Jose, CA, USA, Sep. 2013, pp. 1 – 4.
C36. D. K. Park and H. Lee, “A
40V 10W 93%-efficiency current-accuracy-enhanced dimmable LED driver with
adaptive timing difference compensation for solid-state lighting
applications,” in Proc. IEEE Custom
Integrated Circuits Conference (CICC), San Jose, CA, USA, Sep. 2013,
pp. 1 – 4. (CICC Student Scholarship Award and Nominated for Best
Student Paper Award)
C37. K. Flores and H. Lee, “An
auto-reconfigurable load-dependent wireless power receiver for biomedical
implants,” 15th Annual
SRC TECHCON Conference, Austin, TX,
USA, Sep. 2013 (4 pages). (Best in Session Award)
C38. Z. Liu and H. Lee, “A
synchronous LED driver with dynamic level shifting and simultaneous peak and
valley current control for high-brightness lighting applications,” in Proc. IEEE International Midwest Symposium
on Circuits and Systems (MWSCAS), Columbus, Ohio, USA, Aug. 2013,
pp. 125 – 128. (Nominated for Best Student Paper Award)
C39. Z. Hua and H. Lee, “A
cross-regulation-free triple-output switched-capacitor power regulator for
energy-harvesting applications,” in Proc.
IEEE International Midwest Symposium on Circuits and Systems (MWSCAS),
Columbus, Ohio, USA, Aug. 2013, pp. 352 – 355.
C40. J. Xue, K. Ngo, and H. Lee,
“A 1.6-kW 99%-efficiency zero-voltage-switching boost converter using
normally-off GaN power transistors and adaptive dead-time controlled on-chip
gate drivers,” in Proc. IEEE International Conference
on Electron Device and Solid-State Circuits (ICEDSSC), Hong Kong,
China, Jun. 2013, pp. 1 – 2.
C41. H. Lee and Z. Hua, “Power- and area-efficiency enhancement
technique of switched capacitor power converters for low-power
applications,” in Proc. IEEE
International Conference on Electron Devices and Solid-State Circuits (ICEDSSC), Hong Kong,
China, Jun. 2013, pp. 1 – 2.
C42. Z. Hua, H. Lee, and X. Zhang,
“A reconfigurable dual-output switched-capacitor power regulator with
sub-harmonic fixed-on-time control for energy-harvesting applications,”
in Proc. IEEE International Symposium on
Circuits and Systems (ISCAS), Beijing, China, May 2013, pp. 1472
– 1475.
C43. D. Park and H. Lee, “A
high-efficiency high-accuracy output-capacitor-less integrated LED driver with
time-to-digital control for solid-state lighting applications,” 14th Annual SRC TECHCON Conference, Austin, TX, USA,
Sep. 2012 (4 pages).
C44. M. Du and H. Lee, “A
high-efficiency auto-reconfigurable SITIDO boost/buck regulator with input
power conditioning for energy-harvesting applications,” in Proc. IEEE International Midwest Symposium
on Circuits and Systems (MWSCAS), Boise, Idaho, USA, Aug. 2012, pp.
1092 – 1095.
C45. J. Hua, H. Lee, and K. King,
“An event-driven ultra-low-current battery management system with
reconfigurable linear regulator for multi-cell battery applications,” in Proc. IEEE International Symposium on
Circuits and Systems (ISCAS), Seoul, Korea, May. 2012, pp. 970
– 973.
C46. X. Zhang and H. Lee, “A
power- and area-efficient integrated power management system for
inductively-powered biomedical implants,” in Proc. IEEE Biomedical Circuits and Systems Conference (BioCAS),
San Diego, CA, USA, Nov. 2011, pp. 213 – 216.
C47. X. Zhang and H. Lee, “A
reconfigurable 2x/2.5x/3x/4x SC dc-dc regulator for enhancing area and power
efficiencies in transcutaneous power transmission,” in Proc. IEEE Custom Integrated Circuits
Conference (CICC), San Jose, CA, USA, Sep. 2011, pp. 1 – 4.
C48. M. Du and H. Lee, “Area-
and power-efficient single-inductor multiple-input multiple-output regulators
for energy-harvesting applications,” 13th
Annual SRC TECHCON Conference,
Austin, TX, USA, Sep. 2011 (4 pages).
C49. M. Du, H. Lee, and J. Liu,
“A reconfigurable SITITO boost/buck regulator with sub-threshold
cross-regulation-free dual-mode control for energy-harvesting
applications,” IEEE Symposium on
VLSI Circuits (VLSI-C) Dig. Tech. Papers, Kyoto, Japan, Jun. 2011,
pp. 240 – 241.
C50. M. Du and H. Lee, “A 5-MHz
91% peak power efficiency current-mode buck regulator with an auto-switchable
peak- and valley-current control scheme,” in Proc. IEEE Custom Integrated Circuits Conference (CICC), San
Jose, CA, USA, Sep. 2010, pp. 1 – 4. (CICC Student Scholarship Award
and Nominated for Best Student Paper Award)
C51. M. Du and H. Lee, “A
single-inductor dual-input dual-output buck regulator with enhanced
power-delivery capability for portable power management system,” in Proc. IEEE International Midwest Symposium
on Circuits and Systems (MWSCAS), Seattle, WA, USA, Aug. 2010, pp.
1141 – 1144.
C52. H. Lee and M. Al-Shyoukh, “Stability and transient-response
enhancement techniques for low-dropout regulators,” in Proc. IEEE International Midwest Symposium
on Circuits and Systems (MWSCAS), Seattle, WA, USA, Aug. 2010, pp.
580 – 583.
C53. Y. Zheng, J. Liu, R. Payne, M. Morgan,
and H. Lee, “A 5-Gb/s automatic sub-bit between-pair skew
compensator for parallel data communications in 0.13mm CMOS,” in Proc. IEEE Symposium on VLSI Circuits (VLSI-C), Honolulu,
Hawaii, USA, Jun. 2010, pp. 71 – 72.
C54. M. Al-Shyoukh and H. Lee,
“A current-limiter-based soft-start scheme for linear and low-dropout
regulators,” in Proc. IEEE
International Symposium on Circuits and Systems (ISCAS), May 2010,
pp. 2738 – 2741.
C55. T. Duryea and H. Lee,
“Compact temperature compensation of inductive fly-back clamps for
integrated power switches using a high-voltage base-current-compensated VBE
multiplier,” in Proc. IEEE Applied
Power Electronics Conference and Exposition (APEC), Feb. 2010, pp.
686 – 690.
C56. H. Lee, “A low-voltage low-power comparator with
current-controlled dynamically-biased preamplifiers for DCM buck
regulators,” in Proc. IEEE
International Conference on Electronic Circuits and Systems (ICECS),
Yasmine Hammamet, Tunisia, Dec. 2009, pp. 371 – 374.
C57. D. Kim, V. Gopalakrishna, S. Guo, H.
Lee, M. Torlak, N. K. Ketharnavaz, A. Lobo, and P. Loizou, “On the
design of a flexible stimulator for animal studies in auditory
prosthesis,” in Proc. International
Symposium on Applied Science in Biomedical and Communication Technologies,
Nov. 2009, pp. 1 – 5.
C58. S. Guo and H. Lee,
“Biphasic-current-pulse self-calibration techniques for monopolar current
stimulation,” in Proc. IEEE
Biomedical Circuits and Systems Conference (BioCAS), Nov. 2009, pp.
61 – 64.
C59. X. Zhang and H. Lee, “An
efficiency-enhanced auto-reconfigurable 2x/3x SC charge pump for transcutaneous
power transmission,” in Proc. IEEE
Custom Integrated Circuits Conference (CICC), Sep. 2009, pp. 311
– 314.
C60. S. Guo, H. Lee, and P. Loizou,
“A 9-bit configurable current source with enhanced output resistance for
cochlear stimulators,” in Proc.
IEEE Custom Integrated Circuits Conference (CICC), Sep. 2008, pp.
511 – 513.
C61. M. Du and H. Lee, “A
2.5MHz, 97%-accuracy on-chip current sensor with dynamically-biased shunt
feedback for current-mode switching dc-dc converters,” in Proc. IEEE International Symposium on
Circuits and Systems (ISCAS), May 2008, pp. 3274 – 3277.
C62. M. Du and H. Lee, “A speed-
and accuracy-enhanced on-chip current sensor with local shunt feedback for
current-mode switching dc-dc converters,” in Proc. IEEE Dallas Circuits and Systems Workshop (DCAS),
Dallas, TX, USA, Nov. 2007, pp. 129 – 132.
C63. X. Zhang and H. Lee, “An
88%-power efficiency accuracy-enhanced dc-dc conversion system for
transcutaneous-powered cochlear implants,” in Proc. IEEE Biomedical Circuits and Systems Conference (BioCAS),
Montreal, Canada, Nov. 2007, pp. 126 - 129.
C64. S. Guo and H. Lee, “An
efficiency-enhanced integrated CMOS rectifier with comparator-controlled
switches for transcutaneous powered implants,” in Proc. IEEE Custom Integrated Circuits Conference (CICC),
Sep. 2007, pp. 385 – 388.
C65. S. Guo and H. Lee, “An
area-efficient three-stage amplifier with dual active-capacitive-feedback
compensation,” in Proc. IEEE
International Symposium on Circuits and Systems (ISCAS), May 2007,
pp. 2188 – 2192.
C66. A. P. Lobo, P. C. Loizou, N.
Kehtarnavaz, M. Torlak, H. Lee, A. Sharma, P. Gilley, V. Peddigari, and
L. Ramanna, “A PDA-based research platform for cochlear implants,”
in Proc. International IEEE/EMBS
Conference on Neural Engineering, May 2007, pp. 28 – 31.
C67. A. P. Lobo, P. Loizou, N. Kehtarnavaz,
M. Torlak, H. Lee, A. Sharma, P. Gilley, V. Peddigari, and L. Ramanna,
“A portable research platform for cochlear implants,” Conference on Implantable Auditory
Prostheses, Lake Tahoe, CA, USA, Jul. 2007.
C68. M. Al-Shyoukh, R. A. Perez, and H.
Lee, “A transient-enhanced 20mA-quiescent 200mA-load low-dropout
regulator with buffer impedance attenuation,” in Proc. IEEE Custom Integrated Circuits Conference (CICC),
Sep. 2006, pp. 615 – 618.
C69. S. Guo and H. Lee, “A
low-power active substrate-noise decoupling circuit with feedforward
compensation for mixed-signal SoCs,” in Proc. IEEE International Symposium on Low Power Electronics and Design
(ISLPED), Oct. 2006, pp. 322 – 325.
C70. S. Kwon and H. Lee, “A
1.2V, 3.5µW, 20MS/s, 8-bit comparator with dynamic-biasing
preamplifier,” in Proc. IEEE
International Symposium on Circuits and Systems (ISCAS), May 2006,
pp. 4767 – 4770.
C71. J. Choi, J. Liu, and H. Lee,
“A constant power limit feedforward control circuit for flyback
converters,” in Proc. IEEE Applied
Power Electronics and Exposition (APEC), Mar. 2006, pp. 19 –
23.
C72. G. B. Zhang, H. Lee, and J. Liu,
“A 35nW/pixel 2D visual motion sensor,” in Proc. European Solid-State Circuits Conference (ESSCIRC),
Sep. 2005, pp. 419 - 422.
C73. X. F. Lin, H. Lee, and J. Liu,
“A continuous-time adaptive FIR equalizer with INV-AIL delay line for
2.5Gb/s data communication,” in Proc.
IEEE Custom Integrated Circuits Conference (CICC), Sep. 2005, pp.
413 – 416.
C74. H. Lee, K. N. Leung, and P. K. T. Mok, “Low-voltage analog
circuit techniques using bias-current re-utilization, self-biasing and signal
superposition,” in Proc. IEEE
International Conference on Electronic Devices and Solid-State Circuits (ICEDSSC),
Dec. 2005, pp. 533 – 536.
C75. H. Lee and P. K. T. Mok, “A SC dc-dc converter with
pseudo-continuous output regulation using a three-stage switchable
opamp,” IEEE International
Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers, Feb.
2005, pp.288 – 289.
C76. H. Lee and P. K. T. Mok, “Switching noise reduction
techniques for switched-capacitor voltage doubler,” in Proc. IEEE Custom Integrated Circuits
Conference (CICC), Sep. 2003, pp. 693 – 696.
C77. H. Lee and P. K. T. Mok, “Active-feedback frequency
compensation for low-power multi-stage amplifiers,” in Proc. IEEE Custom Integrated Circuits
Conference (CICC), May 2002, pp. 325 – 328. (Best Student
Paper Award)
C78. H. Lee and P. K. T. Mok, “Single-point-detection slew-rate
enhancement circuits for single-stage amplifiers,” in Proc. IEEE International Symposium on
Circuits and Systems (ISCAS), vol. II, May 2002, pp. 831 –
834.
C79. H. Lee and P. K. T. Mok, “A CMOS current-mirror amplifier
with compact slew rate enhancement circuit for large capacitive load
applications,” in Proc. IEEE
International Symposium on Circuits and Systems (ISCAS), vol. I, May
2001, pp. 220 – 223.
C80. H. Lee and P. K. T. Mok, “A novel voltage-control scheme
for low-voltage dc-dc converters with fast transient recovery,” in Proc. IEEE International Symposium on
Circuits and Systems (ISCAS), vol. I, May 2000, pp. 256 – 259.