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
4. Sang-Gug Lee, "Symmetrical Multi-Layer Spiral Inductor for use in RF Integrated Circuits", US Patent No.6380835, 2002.04.30
29. 이상국, Ngan Hoang, Guillaume Thenaisie, 이정선, “Regulating power method for stand-alone transmitter and stand-alone receivers in wireless power transfer”, US App. No. 15014052, Date, 2016.02.03.
28. 이상국, 기욤 테네시, “리튬 기반 배터리의 진보적인 동적 상태 엔트로피 추출법”, US App. No. 15044400, Date, 2016.02.16.
27. 이상국, 기욤 테네시, "Thermodynamics-aware lithium battery smart charging algorithm", App no. 15044213,, date 2016.02.16
26. Sang-Gug Lee, Yuna Shim, "APPARATUS FOR DUAL BAND FOR RECEIVING IN WIRELESS COMMUNICATION SYSTEM", App no. 14/179,210, date 2014.02.12
25. Sang Gug Lee, Ohyong JUNG, Seungjin Kim, Seok Kyun Han, "Temperature sensor and temperature measurement method thereof", App no. 13/753,650, 2013.01.30
24. Mi-Hyun Son, Yong-Hoon Kim, Byung-tae Yoon, Jong-Wook Zeong, Dong-geun Lee, Jeong-seon Lee, Sang-Gug Lee, "Beamforming apparatus and method in mobile communication system", App no. 13/727,377, 2012.12.26
23. Sang-Gug Lee, Yuna SHIM, "Signal converting apparatus and receiving apparatus for supporting concurrent dual bands in wireless communication system", App no. 13/423,685, 2012.03.16
22. Sang-Gug Lee, Seungjin Kim, "Frequency synthesizer, method of generating output frequency thereof and method of correcting conversion gain thereof", App no. 13/250,037, 2011.09.30
21. Lee Young Jae ,Lee Sang Sung ,Lee Sang-Gug, "DC offset cancellation circuit", App no. 12/950193, 2010.11.19
20. Yeong-Shin Jang, Sang-Gung Lee, "Digital feedforward sigma-delta modulator in analog to digital converter and modulation method, App no. 12/841,533, 2010.06.14
19. Jong-Phil Hong, Sang-Gug Lee,"Gm-boosted differential drain-to-source feedback colpitts voltage controlled oscillator", App no. 12690136, 2010.01.20
18. Jong-Phil Hong, Sang-Gug Lee, and etc,"Low voltage frequency synthesizer using boosting method for power supply voltage of charge pump,Application No. 12/561910,2009-09-14, filed for US Patent..
17. Choong Yul Cha, Hoon Tae Kim, Sang Gug Lee, " Low noise amplifier wide band", App. No, 2009-352380, 2009.06.12
16. Dae Young Yun, Seok kyun Han, Sang Gug Lee," Super regenerative receiver and method of saving power of the same", App. No, 2008-333974, 2008.12.12
15. In Young Lee, Seok Ju Yun, Sang Gug Lee, Seong Hoon Choi, Chang Sun Kim, " Switch, negative reistance cell, and differential voltage controlled oscillator using the same", App. No, 2008-257920, 2008.10.24
14. Hoang Duong Quoc, E.J. Kim, S.G. Lee, J.S. Lee, B.R. Choi ,H.B. Kim,"Variable Gain Amplifier Having Wide Gain Variation and Wide bandwidth", App. No. 2008-210670, 2008.09.15
13. Yun Ah Sim, Ja Won Seo, " Transimpedance amplifier circuit for optical receiver in optical communication system", App No. 2008-193984, 2008.08.19
12. H.Y.Kang, H.K.Choi, Le Qyan, Kwoun Yool, B.T. Kim, S.G.Lee, "Digital automatic gain control apparatus and method in burst mode optical receiver", App No.2008-544250, 2008.06.05
11. D.Q hoang Sang-Gug Lee, T.J Park,“Variable gain amplifier with wide gain variation and wide bandwidth”, App. No, 11/775,105, 2007.07.09
10. Shim,Yuna, Yoon Dae Young, Lee Sagn-Gug," Method of generating muti-channel oscillation frequencies", App No.2007-773261,2007.07.03
9. Jeong-hoon kim, Nam-Jin Oh, Sang-Gug Lee," Quadrature voltage-controlled oscillator", App. No.,2007-733042, 2007.04.09
8. Cha, Choong-Yul,Kim, Hoon-tae, Lee, sang-Gug, “Low noise amplifier for ultra wide band”, App.No., 11/3336,788, 2006.01.23
7. Lee, Han-seung,Duong, Hoang Quoc, Lee, Sang-Gug, " Exponential funtion generator", App.No.,11/338,747,2006.1.25
6. 강호용, 최현균, 레꿘, 권율, 김봉태, 이상국, “버스트 모드 트랜스 임피던스 증폭기의 디지털 자동이득 제어 및 내부 리셋 발생 방법", 출원번호 PCT/KR2006/005213. 2006.12.05
5. Kang, Min-suk, Phan Tuan-anh, Lee, Sang-Gug, " Apparatus and method generating multi RF tone signals in UWB Communication system",App.No.,2005-136363. 2005.05.25
4. Kang, Dong Kyun, Lee, Sang-Gug, " Voltage controlled oscillator using complementary transistors",App No., 2004-941585,2004.09.15
3. Quan Le, Yong-Hun Oh, Sang-Gug Lee, "Burst mode optical receiver",App.No., 2004-810203,2004.03.26
2. Yong-Hun Oh, Quan Le, Sang-Gug Lee,"Apparatus for compensating for characteristics of laser diode and optical transmitter including the apparatus", App .No.,2004-810202, 2004.09.30,
1. Seo, Ja Won, Sang-Gug Lee, "Burst mode optical receiver",App.No.,2003-696142,2003.10.28
1. 유현규, 이상국, "인덕터 내경에 커패시터를 배치한 초고주파 공진회로 구조 및 그 설계방법", 등록번호, 0275541,등록일, 2000.09.21.
1. 최해욱,이상국,유용선,"프로그래머블 DC-DC 컨버터", 출원번호,2000-0032979,출원일,2000.06.15