U.S. Patents
1. H.-S. Lee, “Differential Switched Capacitor Circuit Having Voltage Amplifiers, and Associated Methods,” allowed, January, 2017
2. H.-S. Lee, S. Lee, and A. Chandrakasan, “Methods and Apparatus for Reducing Timing-Skew Errors in Time-Interleaved Analog-to-Digital Converters,” U.S. Patent 9,608,652, March. 2017
3. M. Straayer, H.-S. Lee, et. al., 2-phase threshold detector based circuits, U.S. Patent 9,413,228, Aug. 2016
4. H.-S. Lee, Buffer amplifier circuit, U.S. Patent 9,356,565, May 2016
5. H.-S. Lee and S.-H. Lee, Level-crossing based circuit and method with offset voltage cancellation, U.S. Patent 9,252,658, Feb. 2016
6. H.-S. Lee, Switched capacitor circuits having level-shifting buffer amplifiers, and associated methods, U.S. Patent 9,214,912, Dec. 2015
7. H.-S. Lee, Buffer amplifier circuit, U.S. Patent 9,154,089, Oct. 2015
8. H.-S. Lee, Passive offset and overshoot cancellation for sampled-data circuits, U.S. Patent 8,912,838, Dec. 2014
9. H.-S. Lee, Constant slope ramp circuits for sampled-data circuits, U.S. Patent, 8,854,092, October, 2014
10. S. Shin, D.-Y. Chang, M. Straayer, and H.-S. Lee, Multi-step ADC with sub-ADC calibration, U.S. Patent, 8,723,706, May 2014
11. H.-S. Lee, Passive offset and overshoot cancellation for sampled-data circuits, U.S. Patent, 8,643,424, Feb. 2014
12. M. Straayer, and H.-S. Lee, System and method for background calibration of time interleaved analog to digital converters, U.S. Patent, 8,519,875, August, 2013
13. H.-S. Lee, Offset cancellation for sampled-data circuits, U.S. Patent, 8,519,769, August, 2013
14. M. Guytton and H.-S. Lee, 2-phase threshold detector based circuits, U.S. Patent, 8,432,192, April 2013
15. H.-S. Lee, Offset cancellation for sampled-data circuits, U.S. Patent, 8,373,489, Feb. 2013
16. H.-S. Lee, Passive offset and overshoot cancellation for sampled-data circuits, U.S. Patent, 8,305,131, Nov. 2012
17. H.-S. Lee, Constant slope ramp circuits for sampled-data circuits, U.S. Patent, 8,294,495, Oct. 2012
18. H.-S. Lee, Offset cancellation for sampled-data circuits, U.S. Patent, 7,843,233, Nov. 2010*
19. H.-S. Lee, Constant slope ramp circuits for sample-data circuits, U.S. Patent, 7,737,732, June 2010*
20. H.-S. Lee, Reference circuits for sampled-data circuits, U.S. Patent, 7,616,145, Nov. 2009*
21. H.-S. Lee, and K.G. Fife, Active pixel image sensor with selectable source follower and common source amplifier modes, U.S. Patent, 7,289,149, May 2010
22. H.-S. Lee, and K.G. Fife, Active pixel image sensor with low noise reset, U.S. Patent, 7,697,050, April 2010
23. H.-S. Lee, and K.G. Fife, Low noise active pixel image sensor using a modified reset value, U.S. Patent, 7,609,303, Oct. 2009
24. Matthew Guyton and H.-S. Lee, Low-voltage comparator-based switched-capacitor networks, U.S. Patent, 7,564,273, July 2009
25. H.-S. Lee, and K.G. Fife, Active pixel image sensor with common gate amplifier, U.S. Patent, 7,557,334, July 2009
26. H.-S. Lee, Precision sampling circuit, U.S. Patent, 7,532,042, May. 2009*
27. H.-S. Lee, Reference circuits for sampled-data circuits, U.S. Patent, 7,522,086, April 2009*
28. H.-S. Lee, Output hold circuits for sample-data circuits, U.S. Patent, 7,504,866, March 2009*
29. H.-S. Lee, K.G. Fife, L.G. Brooks, and J. Yang, CMOS active pixel with hard and soft reset, U.S. Patent, 7,489,355, Feb. 2009
30. H.-S. Lee, K.G. Fife, L.G. Brooks, and J. Yang, CMOS active pixel with hard and soft reset, U.S. Patent, 7,489,354, Feb. 2009
31. H.-S. Lee, Sampled-data circuits using zero crossing detection, U.S. Patent, 7,486,115, Feb. 2009*
32. H.-S. Lee, Sampled-data circuits using zero crossing detection, U.S. Patent, 7,459,942, Dec. 2008*
33. H.-S. Lee, and K.G. Fife, Active pixel image sensor with common gate amplifier mode, U.S. Patent, 7,459,667, Dec. 2008
34. H.-S. Lee, K.G. Fife, L.G. Brooks, and J. Yang, CMOS active pixel with hard and soft reset, U.S. Patent, 7,446,805, Nov. 2008
35. H.-S. Lee, and K.G. Fife, and L.G. Brooks, Precise CMOS imager transfer function control for expanded dynamic range imaging using variable-height multiple reset pulses, U.S. Patent, 7,417,678, Aug. 2008
36. J.K. Fiorenza, T. Sepke, H.-S. Lee, and C.G. Sodini, Comparator-based switched capacitor circuit for scaled semiconductor fabrication processes, U.S. Patent, 7,319,425, Jan. 2008**
37. H.-S. Lee, and K.G. Fife, Operational transconductance amplifier for high-speed, low-power imaging applications, U.S. Patent, 7,289,149, Oct. 2007
38. H.-S. Lee, Pixel design including in-pixel correlated double sampling circuit, U.S. Patent, 7,277,129, Oct. 2007
39. H.-S. Lee, Constant slope ramp circuits for sample-data circuits, U.S. Patent, 7,253,600, Aug. 2007*
40. H.-S. Lee and K. G. Fife, Method for cancellation of the effect of charge feedthrough on CMOS pixel output, U.S. Patent, 7,242,429, July 2007
41. K. Gulati and H.-S. Lee, Analog-to-digital converter having parametric configurability, U.S. Patent 7,002,501, February 2006
42. H.-S. Lee and K. G Fife, Circuit and method for cancellation of column pattern noise in CMOS imagers, U.S. Patent 6,903,670, June 2005
43. H.-S. Lee and K. G. Fife, CMOS pixel design for minimization of defect-induced leakage current, U.S. Patent 6,881,992, April 2005
44. K. Gulati and H.-S. Lee, Reconfigurable analog-to-digital converter, U.S. Patent 6,864,822, March 2005
45. H.-S. Lee, CMOS active pixel with reset noise reduction, U.S. Patent 6,777,660, August 2004
46. K. Gulati and H.-S Lee, Reconfigurable analog-to-digital converter, U.S. Patent 6,686,860, February 2003
47. H.-S. Lee, C. G. Sodini, and K.G Fife, Precise MOS imager transfer function control for expanded dynamic range imaging, U.S.
Patent 6,600,471, July 2003
48. L. Lynn, P. Ferguson, and H.-S. Lee, Capacitor-based digital-to-analog converter with continuous time output, U.S. Patent 6,271,784, August 2001
49. H.-S. Lee, J. Bulzacchelli, Bandpass sigma-delta modulator employing high-Q resonator for narrowband noise suppression, U.S. Patent 6,157,329, December 2000
50. H.-S. Lee and A. Shabra, Oversampled pipeline A/D converter with mismatch shaping, U.S. Patent 6,137,431, October 2000
51. H.-S. Lee, Algorithmic A/D converter with digitally calibrated output, U.S. Patent 5,510,789, April 1996
52. A. N. Karanicolas and H.-S. Lee, Digitally self-calibrating pipeline analog-to-digital converter, U.S. Patent 5,499,027, March 1996
53. H.-S. Lee and P. C. Yu, Gain enhancement for amplifier using a replica amplifier, U.S. Patent 5,434,538, July 1995
54. H.-S. Lee, Analog-to-digital conversion circuit with improved differential linearity, U.S. Patent 5,416,485, May 1995**
55. S. Decker, J. L. Wyatt, and H.-S. Lee Resistive fuse circuits for image segmentation and smoothing, U.S. Patent 5,223,754, June 1993
56. H.- S. Lee, Vehicle safety system for driver pedal misapplication, U.S. Patent 5,193,640, March 1993
57. K.K. O, H.-S. Lee and L. R. Reif, Merged bipolar and insulated gate transistors, U.S. Patent 5,028,977, July 1991
58. H.-S. Lee, J. T. Kung, and R. T. Howe, Digital technique for precise measurement of variable capacitance, U.S. Patent 4,860,232, August 1989