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CMOS 28 nm Fully On-Chip wideband Circulator IC
Ngo Tan Binh,Do Quang Huy,Yoon Sang-Woong 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.11
Herein, we verify the CMOS non-magnetic non-reciprocal passive circulator based on 4-path staggered commutation network that can break Lorentz reciprocity and replace ferrite-based circulator used for decades in history of wireless communication. The circulator prototype is designed in Samsung 28nm RF process, operated at 2.16 GHz, which exhibits 5 dB of loss in the transmitter-antenna (TX-ANT), 6.6 dB in the antenna-receiver (ANT-RX) path and has high isolation (TX-RX) up to 40 dB at single frequency of 2.16 GHz. To extend bandwidth of operation, we propose 3 on-chip branches of negative capacitor circuit (NCAP) delay lines instead of passive LC network counterparts. Besides, the clock generator is integrated on chip to guarantee a very compacted design. The measured results shows that the proposed circulator can work in the bandwidth of 65 MHz from 1.985 GHz to and 2.05 GHz and suffers 6 dB, 9dB maximum in-band loss for TX-ANT, ANT-RX path respectively while the TX-RX path achieves 40.5 dB of minimum isolation. The circulator IC costs a die area of only 1.1 x 1 mm². The IC consumes 7.2 mW for clock generator part, 14.4 mW for clock divider part and 54 mW for NCAP delay lines.
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A Compact 6-bit Phase Shifter in 65 nm RF CMOS Technology for ISM Band
Tan-Binh Ngo,Quang-Huy Do,Sang-Woong Yoon 대한전자공학회 2022 Journal of semiconductor technology and science Vol.22 No.3
We presented a 6-bit switched-network type phase shifter, which was implemented in Samsung 65nm RF CMOS technology. The phase shifter was designed with lumped-element filter topologies using inductors and capacitors for compact size. For 64 states, in the frequency of 2.12 GHz - 2.51 GHz, measured insertion loss was -9.7±1.5 dB. The input and output return loss were above 8.2 dB and 10 dB, respectively. The rms phase error and rms amplitude error were less than 3° and 0.87 dB, respectively. The chip size with including pads was 1.4 × 0.81 mm2.
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Leakage Power Canceling Module with a Negative Capacitor for a Circulator’s Isolation
NGO TAN BINH,Do Quang-Huy,윤상웅 한국전자파학회 2023 Journal of Electromagnetic Engineering and Science Vol.23 No.2
In this study, we developed a leakage power canceling module (LPCM) incorporating a negative capacitor (NCAP). The NCAP provided the circulator with a wide bandwidth, rendering it suitable for retrodirective short-range wireless power transfer applications. The proposed LPCM consisted of a directional coupler, a hybrid coupler, and a low-pass filter network with an NCAP that exhibited the frequency response required to realize leakage power cancellation from the transmitter output to the receiver input. The two couplers were fabricated in an FR4 printed circuit board, and the NCAP was implemented using Samsung LR6LP 65 nm RF CMOS IC technology. The NCAP chip provided a capacitance of -2 pF and consumed a DC voltage and current of 3 V and 13 mA, respectively. The size of the fabricated LPCM was 41 mm × 37 mm. The application of the proposed LPCM was demonstrated with a commercial circulator. The S-parameter measurements indicated that the leakage cancellation was 20‒46 dB at a frequency range of 2.29–2.515 GHz. The bandwidth was defined considering a leakage cancellation of more than 20 dB, and the actual and fractional bandwidths were 222 MHz and 9.25%, respectively.
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Retrodirective RF System for Wireless Power Transfer
Wan-Su Kim,Nhut-Tan Doan,Tan-Binh Ngo,Sang-Woong Yoon 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.6
This paper presents the overall wireless power transfer RF system with circulator for phase conjugating Retro-directive array (RDA). This work consists of two main parts. The former presents the Retrodirective System & Feed-forward-Cancellation (FFC) part while focus on beam of 1 x 4 RDA system & the improved transmitter (Tx) to receiver (Rx) isolation. The latter includes design of integrated circuits for power amplifier and drive amplifier. This system operates with Tx frequency of 2.4 GHz and Rx frequency of 2.5 GHz. The beamforming accuracy and minimum sensitivity of the RF system depends on the Tx-Rx isolation characteristic of the circulator. Hence, to enhance the isolation, FFC technique is incorporated. The isolation performance at 2.4 GHz and 2.5 GHz is improved by 18 dB and 21 dB, respectively, in this work.
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A CMOS Low-pass Filter With Group Delay Cancellation using Non-Foster Element Circuits
Quang-Huy Do,Tan-Binh Ngo,Sang-Woong Yoon 대한전자공학회 2024 Journal of semiconductor technology and science Vol.24 No.2
We presented a CMOS lumped-element (LE) low-pass filter (LPF) with a group delay (GD) cancellation technique that uses parallel resonators comprising negative inductance and negative capacitance circuits. An inherent positive GD from the LEs of the LPF is canceled by a negative GD from the resonator. The LPF was implemented in the Global Foundry 8SF 130-nm RF CMOS Integrated Circuit (IC) technology. The core chip size was 1135 µm 474 µm. The maximum passband frequency of the LPF was measured to be 1.5 GHz with a return loss of more than 10 dB, in-band loss of 0.8‒2.4 dB, and out-of-band roll-off rate of 41.5 dB/GHz. The GDs at frequencies below 1 GHz were 0.31‒0.33 ns and decreased to zero at 1.51 GHz. The noise figures were around 13.4‒17.7 dB.
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