Journal

​

2022

​

[60] Kyutaek Oh, Sangjin Yoo, Ockgoo Lee, 

"Design of a Compact-sized Broadband Lumped-Distributed Balun including Impedance Matching",

accepted for The Journal of Korea Institute of Electromagnetic Engineering and Science.

​

[59] Sangjin Yoo, Kyutaek Oh, Hyunjin Ahn, Ockgoo Lee, 

"Design of Fully Integrated Impedance Transforming Multi-Winding 90° Coupler",

accepted for The Journal of Korea Institute of Electromagnetic Engineering and Science.

​

[58] Geun Tae Kim, Kyu Taek Oh, Hyun Jin Ahn, Ock Goo Lee,

"Fully Integrated Triple-Mode Ka-Band Power Amplifier with Vertical-Horizontal Combined Transformer for 5G NR Applications",

IDEC Journal of Integrated Circuits and Systems, vol. 8, no. 4, Oct. 2022.

 

[57] Kyutaek Oh, Hyunjin Ahn, Ilku Nam, Ockgoo Lee,

"A 24-to-44 GHz Compact Linear 5G Power Amplifier with Open-Terminated Balun in 65nm Bulk CMOS",

ESSCIRC 2022-IEEE 48th European Solid State Circuits Conference (ESSCIRC), Sep., 2022.

​

[56] S Lee, Y Jeon, DY Yoon, O Lee, D Im, I Nam,

"28-GHz CMOS Up-Conversion Mixer With Improved LO Second-Harmonic Leakage Signal Suppression for 5G Applications"

IEEE Access, vol. 10, May 2022.

​

2021

[55] H. Ahn, K. Oh, I. Nam, and O. Lee,

"A Highly Efficient and Linear mm-wave CMOS Power Amplifier Using a Compact Symmetrical Parallel–Parallel Power Combiner with IMD3 Cancellation for 5G Applications"

IEEE Access, vol. 9, Nov. 2021.

​

[54] Y. Jeon, S. Lee, G. Park, J. Myung, S. Lee, O. Lee, H. Moon, and I. Nam,

"A 24-GHz CMOS Receiver Front-end for In-Cabin Radar Systems"

Journal of Semiconductor Technology and Science, vol. 21, no. 4, Aug. 2021. 

​

[53] I. Nam, O. Lee, and D. Im,

"A Wideband Sub -GHz Receiver Front -end Supporting High Sensitivity and Selectivity Mode"

Journal of Semiconductor Technology and Science, vol. 21, no. 4, Aug. 2021. 

​

[52] K. Oh, H. Ahn, I. Nam, H. D. Lee, B. Park, and O. Lee

"A Dual Mode InGaP/GaAs HBT Power Amplifier Using a Low-Loss Parallel Power-Combining Transformer with IMD3 Cancellation Method"

Electronics, vol. 10, no. 14, July 2021.

​

[51] H. Ahn, K. Oh, I. Nam, and O. Lee,

"Highly Efficient HBT Power Amplifier using High-Q Single- and Two-Winding Transformer with IMD3 Cancellation"

IEEE Access, vol. 9, June 2021.

​

[50] H.-W. Kim, M. Ahn, O. Lee, H. Kim, H. Kim, and C.-H. Lee,

"Analysis and Design of a Fully-Integrated High-Power Differential CMOS T/R Switch and Power Amplifier using Multi-section Impedance Transformation Technique"

Electronics, vol. 10, no. 9, Apr. 2021.

​

2020

​

[49] S. Lee, Y. Jeon, G. Park, J. Myung, S. Lee, O. Lee, H. Moon, I. Nam,

"A 24-GHz RF transmitter in 65-nm CMOS for in-cabin radar applications,"

Electronics, vol. 9, no. 12, Dec. 2020.

​

[48] H. Ahn and O. Lee,

"Fully Integrated Ka-Band Power Amplifier with Parallel Power Combiner using Single-Winding Transformer",

IDEC Journal of Integrated Circuits and Systems, vol. 6, no. 4, Oct. 2020.

​

[47] H. Ahn, B. C. Son, H. Ryu, and O. Lee,

"A Parallel-Segmented CMOS Step-Up Autotransformer and Modeling",

The Journal of Korea Institute of Electromagnetic Engineering and Science, vol. 31, no. 11, Nov. 2020.

​

[46] H. Ahn, I. Nam, D.-H. Lee, and O. Lee, 

"An integrated low-loss lumped-element quadrature coupler using a distributed model",

Journal of Semiconductor Technology and Science, vol. 20, no. 3, June 2020. 

​

[Inter Conf.] H. Ahn, I. Nam, and O. lee, 

“A 28-GHz Highly Efficient CMOS Power Amplifier Using a Compact Symmetrical 8-Way Parallel-Parallel Power Combiner with IMD3 Cancellation Method" 

Proc. IEEE RFIC symp., 2020. 

​

[45] S.-E. Choi, H. Ahn, J. Hur, K.-W. Kim, I. Nam, J. Choi, and O. Lee, 

"A fully integrated compact outphasing CMOS power amplifiers using a parallel-combining transformer with a tuning inductor method",

Electronics, 2020, 9, 257; doi:10.3390/electronics9020257, Feb. 2020.

​

[44] H. Ahn, I. Nam, and O. Lee, 

"An integrated lumped-element quadrature coupler with impedance transforming",

IEEE Microwave and Wireless Components Letters, vol 23, no. 2, pp. 152-155, Feb. 2020. 

​

[43] D.-H. Lee, J. Kim, O. Lee, and C.-S. Lee, 

"A cost-effective variable coupler with sliding printed circuit boards"

International Journal of Microwave and Optical Technology, vol. 15, no. 1, pp. 58-63, Jan. 2020.

​

2019

​

[42] C. Kim, M. Kim, Y. Jeon, O. Lee, J. H. Son, and I. Nam,

"A 28-GHz CMOS down-conversion mixer with low-magnetic-coupled source degeneration inductors for 5G applications,"

Journal of Semiconductor Technology and Science, vol. 19, no. 4, pp. 373-377, Aug. 2019.

​

[41] H. Ahn, S. Baek, I. Nam, D. An, J. Lee, M, Jeong, B.-E. Kim, Y. Lee, H.-T. Kim, Y.-C. Ho, and O. Lee,

"A fully integrated -32 dB EVM broadband 802.11abgn/ac PA with an external PA driver in WLP 40nm CMOS", 

IEEE Trans. Microw. Theory Tech., vol 67, no. 5, pp. 1870-1882, May 2019.

​

[40] D.-H. Son, H. Ahn, I. Nam, and O. Lee, 

“An on-chip low-loss reconfigurable transformer for multimode power amplifiers”, 

Microwave and Optical Technology Letters, vol. 61, pp. 943-947, Apr. 2019.

 

2018

​

[39] Sung Wook Yoon, Yangji Jeon, Changyeol Kim, Ockgoo Lee, Ilku Nam,

“A Wideband UHF CMOS Receiver Front-end Robust to GSM Interference Signals”,

Journal of The Institute of Electronics and Information Engineers, vol. 55, no.12, Dec. 2018.

​

[38] S.-E. Choi, H. Ahn, H. Ryu, I. Nam, and O. Lee, 

“Fully Integrated CMOS PAs with Two-Winding and Single-Winding Combined Transformer for WLAN Applications”,

IEICE Transactions on Electronics, vol. 101, no. 12, pp. 931-941, Dec. 2018.

​

[37] B. Shin, C. Kim, O. Lee, S. R. Park, S. Noh, and I. Nam, 

“A 24 GHz Receiver front-end with Improved I/Q balanced LO generator in 65-nm CMOS for surveillance radar systems",

Journal of Semiconductor Technology and Science, vol.18, no. pp. 475-479, Aug. 2018.

​

[36] J. H. Lee, G. T. Kim, J. Kim, O. Lee, K.-J. Koh, D.-H. Lee, 

“A Linearity Improvement Technique for Two-Stage Amplifiers with Second Harmonic Driving”, 

International Journal of Microwave and Optical Technology, vol. 13, no. 4, pp. 310-316, July 2018.

​

[35] S. Baek,H. Ahn,I. Nam,J. Hur,Y. Yoon, and O. Lee, 

"A 5.5-GHz CMOS power amplifier using parallel-combined transistors with cascode adaptive biasing for WLAN applications", 

IEICE Electronics Express, vol. 15, no. 9, pp. 1-8, Apr. 2018. 

​

[34] H. Ahn, S. Baek, I. Nam, and O. Lee, 

"Fully integrated WLAN CMOS PA with reconfigurable transformer" 

Electron. Lett., vol. 54, pp. 574-576, Mar. 2018.

 

2017

 

[33] H. Ahn, S. Choi, H. Ryu, S. Baek, I. Nam, and O. Lee, 

"2.3-GHz HBT Power Amplifier with Parallel-Segmented On-Chip Autotransformer",

IEEE Microwave and Wireless Components Letters, vol 27, no. 12, pp. 1140-1142, Dec. 2017. 

​

[32] H.-W. Kim, M. Ahn, O. Lee, H. Kim, Y. Yoon, H. Kim, C.-H. Lee, and J. Laskar, 

"Design and analysis of CMOS T/R switches with the impedance transformation technique", 

IEEE Microwave and Wireless Components Letters, vol 27, no. 12, pp. 1137-1139, Dec. 2017.

​

[31] Y. Lim, J. Lee, Y. Lee, S.-S. Song, H.-T. Kim, O. Lee, J. Choi, 

“An External Capacitor-Less Ultralow-Dropout Regulator Using a Loop-Gain Stabilizing Technique for High Power-Supply Rejection Over a Wide Range of Load Current”, 

IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol. 25, pp. 3006-3018, Nov. 2017. 

​

[30] D. H. Woo, I. Nam, O. Lee, and D. Im, 

“A UHF CMOS variable gain LNA with wideband input impedance matching and GSM interoperability”, 

Journal of Semiconductor Technology and Science, pp. 499-504, Aug. 2017. 

​

[29] H. Ahn, S. Baek, I. Nam, D. An, J. K. Lee, M. Jeong, B.-E. Kim, J. Choi, and O. Lee, 

"A fully integrated dual-mode power amplifier with an autotransformer-based parallel combining transfomer", 

IEEE Microwave and Wireless Components Letters, vol. 27, no. 9, pp. 833-835, Sep. 2017.

 

[28] S. Baek, H. Ahn, H. Ryu, I. Nam, D. Ahn, D.-H. Choi, M.-S. Byun, M. Jeong, B.-E. Kim, and O. Lee, 

“A Fully Integrated Dual-Band WLP CMOS amplifier for 802.11n WLAN applications”, 

Journal of Electromagnetic Engineering and Science, vol. 17, no 1, pp. 20-28, Jan. 2017.

  

[27] C. Choi, J. H. Son, O. Lee, and I. Nam, 

"A +12-dBm OIP3 60-GHz RF Down-Conversion Mixer with an Output-Matching, Noise- and Distortion-Cancelling Active Balun for 5G Applications”, 

IEEE Microwave and Wireless Components Letters, vol. 27, no. 3, pp. 284-286, Mar. 2017.   

  

[26] D. Im, O. Lee, and I. Nam, 

“A TV receiver front-end with linearized LNA and current-summing harmonic rejection mixer”, 

IEEE Trans. Circuits Syst. II., vol. 64, pp. 269-273, Mar. 2017.

​

2016

​

[25] Hee-Sung Yang, Ockgoo Lee, Ilku Nam,

"A 24 GHz I/Q LO Generator for Heartbeat Measurement Radar System"

Journal of The Institute of Electronics and Information Engineers, vol.53, no.11, Nov. 2016.

​

[24] S. Baek, H. Ahn, I. Nam, N. Ryu, H. D. Lee, B. Park, and O. Lee, 

“A Linear InGaP/GaAs HBT Power Amplifier Using Parallel-Combined Transistors With IMD3 Cancellation”, 

IEEE Microwave and Wireless Components Letters, vol. 26, no. 11, pp. 921-923, Nov. 2016.

  

[23] J. Hur, H. Kim, O. Lee, K.-W. Kim, K. Lim, C.-H. Lee, and J. Laskar, 

“A multi-level class D CMOS power amplifier for an out-phasing transmitter with a non-isolated power combiner", 

IEEE Trans. Circuits Syst. II., vol. 63, pp. 618-622, July 2016.

  

[22] I. Nam, C. Choi, O. Lee, and H. Moon, 

"A Fully Differential RC Calibrator for Accurate Cut-off Frequency of a Programmable Channel Selection Filter”, 

Journal of Semiconductor Technology and Science,vol.16, pp. 682-686, May 2016.

 

[21] S. Baek, H. Ryu, I. Nam, M. Jeong, B.-E. Kim, and O. Lee, 

“A 2.4-GHz CMOS power amplifier with parallel-combined transistors and selective adaptive biasing for wireless LAN applications”, 

Microwave and Optical Technology Letters, vol. 58, pp. 1374-1377, June 2016.

  

[20] H. Ahn, S. Baek, H. Ryu, I. Nam, and O. lee, 

“A highly efficient WLAN CMOS PA with two-winding and single-wing combined transformer,” in 

Proc. IEEE RFIC symp., May 2016, pp.310-313.

 

2015

 

[19] Hyunsik Ryu, Ilku Nam, and Ockgoo Lee, 

“A reconfigurable monolithic step-up autotransformer”, 

Microwave and Optical Technology Letters, pp. 1662-1666, July 2015. 

 

[18] Ockgoo Lee, Hyunsik Ryu, Seungjun Baek, Ilku Nam, Minsu Jeong, and Bo-Eun Kim, 

“A high-efficiency CMOS power amplifier using 2:2 output transformer for 802.11n WLAN applications”, 

Journal of Semiconductor Technology and Science, pp. 280-285, April. 2015. 

 

2014

 

[17] O. Lee,  J. Han,  K. H. An,  H. Kim,  J. Hur,  K. Yang,  K. Lim,  C.-H. Lee,  J. Laskar, 

“Optimization of CMOS power-cell layout for improving junction breakdown”, 

IEICE Electronics Express, vol. 11, no. 19, pp. 1-7, Oct. 2014.

 

2013

 

[16] J. Hur, H. Kim, O. Lee, S. Woo, K. Kim, W. Kim, C.-H. Lee, K. Lim and J. Laskar, 

“Multi-level LINC transmitter with non-isolated power combiner ”, 

Electronics Letters, vol. 49, no. 25, pp. 1624-1625, Dec. 2013. 

 

[15] H. Jeon, K.-S. Lee, O. Lee, K. H. An, Y. Yoon, H. Kim, K. W. Kobayashi, C.-H. Lee,  J. S. Kenney, 

"A Cascode Feedback Bias Technique for Linear CMOS Power Amplifiers in a Multistage Cascode Topology", 

IEEE Trans. Microw. Theory Tech., vol. 61, no. 2, pp. 890-901, Feb. 2013. 

 

2012

 

[14] O. Lee, K. H. An, J. Cho, J. Cha, 

“A switchless reconfigurable transformer CMOS power amplifier”, 

IEICE Electronics Express, vol. 9, no. 9, pp. 855-860, May 2012.

 

[13] Y. Yoon, J. Kim, H. Kim, K. H. An, O. Lee, C.-H. Lee, and J. S. Kenney, 

“A dual-mode CMOS RF power amplifier with integrated tunable matching network”, 

IEEE Trans. Microw. Theory Tech.,vol. 60, no. 1, pp. 77-88, Jan. 2012.

 

2011

 

[12] Y. Yoon, H. Kim, J. Cha, O. Lee, H. S. Kim, W. Kim, C.-H. Lee, and J. Laskar, 

"A fully-integrated concurrent dual-band CMOS power amplifier with switchless matching network",

Electron. Lett, vol. 47, May 2011.

 

[11] D.-H. Lee, K. H. An, O. Lee, H. Kim, C.-H. Lee, J. Laskar, 

“A mixed bias-mode power amplifier for WCDMA applications”, 

Microwave and Optical Technology Letters, vol. 53, no. 11, pp. 2547-2552, Nov. 2011.

 

[10] J. Hur, H. Kim, O. Lee, K.-W. Kim, F. Bien, and K. Lim, 

“An amplitude and phase mismatches calibration technique for the LINC transmitter with unbalanced phase control", 

IEEE Transactions on Vehicular Technology, vol. 60, no. 9, pp. 4184-4193, Nov. 2011.

 

[9] J. Cho and O. Lee, 

“Analysis on performance for network sharing in adjacent channels”, 

The Journal of The Institute of Webcasting, Internet and Telecommunication, vol. 11, no. 5, pp. 179-184, Oct. 2011.

 

[8] O. Lee, K. H. An, C.-H. Lee, and J. Laskar, 

“A parallel-segmented monolithic step-up transformer", 

IEEE Microwave and Wireless Components Letters, vol. 21, no. 9, pp. 468 - 470, Sep. 2011.

 

2010

 

[7] O. Lee, K. H. An, H. Kim, K. S. Yang, D.-H. Lee, J. H. Han, C.-H. Lee, H. Kim, and J. Laskar, 

“Analysis and design of fully integrated parallel-circuit class-E CMOS power amplifiers for watt level applications",

IEEE Trans. Circuits Syst. I., vol. 57, pp. 725-734, Mar. 2010.

 

[6] O. Lee, J. Han, K. H. An, D. H. Lee, K. S. Lee, S. Hong, and C.-H. Lee, 

“A charging acceleration technique for highly efficient cascode class-E CMOS power amplifiers", 

IEEE J. Solid-State Circuits, vol. 45, pp. 2184-2197, Oct. 2010.

 

[5] J. Hur, O. Lee, C.-H. Lee, K. Lim, and J. Laskar, 

“A multi-level and multi-band class-D CMOS power amplifier for the LINC system in the cognitive radio application", 

IEEE Microwave and Wireless Components Letters, vol. 20, no. 10, June. 2010.

 

2009

 

[4] J. Hur, O. Lee, K. Kim, K. Lim, and J. Laskar, 

“Highly efficient uneven multi-level LINC transmitter", 

Electron. Lett, vol. 45, July 2009.

 

[3] K. H. An, D. H. Lee, O. Lee, H. Kim, J. Han, W. Kim, C.-H. Lee, H. Kim, and J. Laskar, 

“A 2.4 GHz fully integrated linear CMOS power amplifier with discrete power control", 

IEEE Microwave and Wireless Components Letters, vol. 19, no. 7, Jul. 2009.

 

2008

 

[2] K. H. An, O. Lee, H. Kim, K. S. Yang, D.-H. Lee, J. H. Han, Y. Kim, J. J. Chang, W. Woo, C.-H. Lee, and J. Laskar, 

“A power-combining transformer technique for fully-integrated CMOS power amplifiers”, 

IEEE J. Solid-State Circuits, vol. 43, pp. 1064-1075, May 2008.

 

2005

 

[1] O. Lee, J.-G. Kim, K. Lim, J. Laskar, and S. Hong, 

“A 60-GHz push-push InGaP HBT VCO with dynamic frequency divider”, 

IEEE Microwave and Wireless Components Letters, vol. 15, no. 10, Oct. 2005.