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A CMOS W-Band Amplifier with Tunable Neutralization Using a Cross-Coupled MOS–varactor Pair

1
School of Electrical Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 02841, Korea
2
Agency for Defense Development, Yuseong P.O.Box 35, Daejeon 34186, Korea
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(5), 537; https://doi.org/10.3390/electronics8050537
Received: 21 March 2019 / Revised: 27 April 2019 / Accepted: 10 May 2019 / Published: 13 May 2019
(This article belongs to the Section Microwave and Wireless Communications)
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PDF [4780 KB, uploaded 13 May 2019]
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Abstract

This paper presents a CMOS W-band amplifier adopting a novel neutralization technique for high gain and stability. The W-band amplifier consists of four common-source differential gain cells that are neutralized by a cross-coupled MOS–varactor pair. Contrary to conventional neutralizations, the proposed technique enables tunable neutralization, so that the gate-to-drain capacitance of transistors is accurately tracked and neutralized as the varactor voltage is adjusted. This makes the neutralization tolerant of capacitance change caused by process–voltage–temperature (PVT) variation or transistor model inaccuracy, which commonly occurs at mm-wave frequencies. The proposed tunable neutralization is experimentally confirmed by measuring gain and stability of the W-band amplifier fabricated in a 65-nm CMOS process. The amplifier achieves a measured gain of 17.5 dB at 79 GHz and a 3-dB bandwidth from 77.5 to 84 GHz without any stability issue. The DC power consumption is 56.7 mW and the chip area is 0.85 mm2. View Full-Text
Keywords: CMOS W-band amplifier; tunable neutralization; MOS–varactor; transformer-based impedance matching CMOS W-band amplifier; tunable neutralization; MOS–varactor; transformer-based impedance matching
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Yook, B.; Park, K.; Park, S.; Lee, H.; Kim, T.; Park, J.S.; Jeon, S. A CMOS W-Band Amplifier with Tunable Neutralization Using a Cross-Coupled MOS–varactor Pair. Electronics 2019, 8, 537.

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