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  • 33. 이상국, 서정일, 임백민, "CURRENT MODE HYSTERETIC BUCK CONVERTER WITH AUTO-SELECTABLE FREQUENCY LOCKING CIRCUIT", Us patent. no. 10199917, Date, 2017.08.30.

  • 32. 이상국, 임백민, 서정일, 구현모, "POWER MANAGEMENT DEVICE", Us patent. no. 9923453, Date, 2017.05.24.

  • 31. 이상국, 김선아, 최경용, 박대웅, 한석균,“LOW NOISE AND HIGH INTEGRATION FOCAL PLANE ARRAY SYSTEM USING FREQUENCY CONVERSION FOR REAL-TIME TERAHERTZ IMAGINIG", Us patent. no. 9,341,709, Date, 2016.05.17.

  • 30. Seong Joong Kim, Jae Sup Lee, Sang Gug Lee, Jae Seung Lee, Sok Kyun Han, "Envelope detection apparatus dynamically controlled in response to input signal and envelope detection method thereof ", US patent no.8300744, date 2015.10.13

  • 29. Sang-Gug Lee, Yuna Shim, "SIGNAL CONVERTING APPARATUS AND RECEIVING APPARATUS FOR SUPPORTING CONCURRENT DUAL BANDS IN WIRELESS COMMUNICATION SYSTEM", US patent no.8688063, date 2014.04.01

  • 28. Ji Hun Kim, Hyun Min Song, Joon Ho Na, Ki Uk Gwak, Sang Gug Lee, "Circuit and method for measuring capacitance value of touch screen", US patent no.8674709, date 2014.03.18

  • 27. Sang-Gug Lee, Seungjin Kim, "FREQUENCY SYNTHESIZER, METHOD OF GENERATING OUTPUT FREQUENCY THEREOF AND METHOD OF CORRECTING CONVERSION GAIN THEREOF", US patent no.8659323, date 2014.02.25

  • 26. Ho-Yong Kang, Hyun-Kyun Choi, Le Quan, Kwon Yool, Bong-Tae Kim, Sang-Gug Lee, "Digital Automatic Gain Control Apparatus and Method in Burst Mode Optical Receiver", US patent no.8660439, date 2014.02.25

  • 25. Sun a Kim, Dae-Young Yoon, Sang-Gug Lee, Hyung-Chul Park, Jeong-seon Lee, "Apparatus for rejecting image in receiver", US patent no.8300744, date 2012.10.30

  • 24. Kang Ho-Yong,Yoon Dae-Young,Nguyen Trung-kien,Kim JE,Yu X,Kim NS,Pyo CS,Han SK,Lee Sang-Gug, "Wake-up receiver and wake-up method using duty cycling and power off technique", US patent no.8285243, date 2012.10.09

  • 23. Lee Young Jae ,Lee Sang Sung ,Lee Sang-Gug, "DC offset cancellation circuit", US patent no.8222944, date 2012.07.17

  • 22. Kang Hoyong ,Yu Xiaohua ,Kim Ji Eun ,Nguyen TK ,Yoon DY ,Kim NS ,Pyo CS ,Han SK ,Lee Sang Gug, "Super regenerative receiver and method of saving power of the same", US patent no.7741922, date 2012.05.01

  • 21. Jang Yeong-Shin, Lee Sang-Gug, Ryu Seung-Tak, "Digital feedforward sigma-delta modulator in analog-to-digital converter and modulation method thereof", US patent no.8120518, date 2012.02.21

  • 20. Lee Sang-Gug ,Hong Jong-Phil, "GM-boosted differential drain-to-source feedback colpitts voltage controlled oscillator", US patent no.8106718, date 2012.01.31

  • 19. Sang-Gug Lee, Lee Sang-sung, "Harmonic rejection mixer and harmonic rejection mixing method", US patent no.7986192, date 2011.07.26

  • 18. In Young Lee, Sang-Gug Lee, "Switch negative resistance cell, and differential voltage controlled oscillator using the same", US patent no.7741922, date 2010.06.22

  • 17. Shim Yuna, Sang-Gug Lee, "Method of generating multi-channel local oscillation frequencies", US patent no. 7817737, date 2010.10.19

  • 16. Ho Yong Kang, Sang Gug Lee, Seo, Jawon, Kang, HoYong, Lee, Sang Gug, "Burst mode optical receiver for maintaining constant signal amplitude", Us patent No. US7,539,424, 2009.05.26

  • 15. Hoang Duong Quoc, Sang Gug Lee," Variable gain amp with wide gain variation and wide bandwidth", US patent no, US7,557,657, 2009.07.07

  • 14. M.S. Kang, P.T Anh, E.H. Park, C.D. Suh, C.W. Kim, S.G. Lee, "Apparatus and method generating multi RF tone signal UWB communication", US patent no, 7,536,163, 2009.05.19

  • 13. Oh, Nam Jin, Yang, Moon Su, Lee, Sang Gug ", Heterodyne receiver for low noise and image frequency repression", Us Patent No. 7389098, 2008.06.17

  • 12. Seo, Jawon, Kang, HoYong, Lee, Sang Gug, "Burst mode optical receiver considering characteristic of extinction ration of received optical signal", Us patent No. 7369781, 2008.05.06

  • 11. Sang-Gug Lee, Nam-jin Oh,"Offset local oscillator without using frequency divider", US patent No,7319366, 2008.01.15

  • 10. Sang-Gug Lee, So-Bong Sin, Seok-Ju Yun, "Differential Voltage Controlled Oscillator Using Complementary Transistors Cross-coupled in Series and Transceiver using The Same“ US, Patent No. 7304548, 2007.12.04

  • 9. Sang-Gug Lee, So-Bong Sin, "Source-Injection Parallel Coupled LC-Quadrature Controlled Oscillator", Us patent. No. 7,199,675, 2007.04.03

  • 8. Sang-Gug Lee, Hae-Ryoung, Kim", Low power quadrature voltage controlled oscillator using back gate", Us patent No. 7,145,409, 2006.12.05

  • 7. Dong-kyun Kang,Choong-yul Cha, Sang-gug Lee, " Complementary voltage controlled oscillator", US patent no, 7123112,2006.10.17

  • 6. Sang-Gug Lee, Jeong-Ki Choi, and Nam-Su Kim, "Current-Reused Bleeding Mixer", US patent No.6892062, 2005, 05.10

  • 5. Hyun-Kyu Yu, Sang-Gug, Lee, "Automatically gain controllable linear differential amplifier using variable degeneration resistor" US patent No.6605996, 2003.08.12

  • 4. Sang-Gug Lee, "Symmetrical Multi-Layer Spiral Inductor for use in RF Integrated Circuits", US Patent No.6380835, 2002.04.30

  • 3. Sang-Gug Lee, "Low Voltage Balun Circuit", US Patent No.6265908, 2001.07.24
  • 2. C. Stuebing, R.D. Schultz, T.D. Brogan, and Sang-Gug Lee, "Low Voltage RF Amplifier and Mixed with Single Bias Block and Method", US Patent No. US5809410, Sep,1998.
  • 1. G.D.Croft, S.R.Jost, and Sang-Gug Lee, "Method of Making a Reference Current Generator", US Patent No.US5686822, Nov.1997.