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

Authors
Yook, ByunghoPark, KwangwonPark, SeungwonLee, HyunkyuKim, TaehoonPark, Jong SungJeon, Sanggeun
Issue Date
5월-2019
Publisher
MDPI
Keywords
CMOS W-band amplifier; tunable neutralization; MOS-varactor; transformer-based impedance matching
Citation
ELECTRONICS, v.8, no.5
Indexed
SCIE
SCOPUS
Journal Title
ELECTRONICS
Volume
8
Number
5
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/65913
DOI
10.3390/electronics8050537
ISSN
2079-9292
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 mm(2).
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공과대학 (전기전자공학부)
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