A 40-GHz 4-Bit Digitally Controlled VGA With Low Phase Variation Using 65-nm CMOS Process

A 40-GHz variable gain amplifier (VGA) with 4-bit digital gain control and low phase variation is designed and fabricated on the 65-nm CMOS process. The digital gain control mechanism is achieved using the presented digital version current steering topology. The measured gain of the VGA is between 2...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 29; no. 11; pp. 729 - 732
Main Authors Tsai, Jeng-Han, Lin, Chia-Lung
Format Journal Article
LanguageEnglish
Published IEEE 01.11.2019
Subjects
Current steering
digital control
Gain
Gain control
Logic gates
low phase variation
millimeter-wave (MMW)
Topology
Transistors
variable gain amplifier (VGA)
Voltage control
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Summary:A 40-GHz variable gain amplifier (VGA) with 4-bit digital gain control and low phase variation is designed and fabricated on the 65-nm CMOS process. The digital gain control mechanism is achieved using the presented digital version current steering topology. The measured gain of the VGA is between 22 and 6 dB at 40 GHz with 16 different linear-in-decibel gain states. Using the proposed two-stage digital version current steering VGA phase compensation technique, the measured phase variation is 3.18° within a 16-dB gain control range (GCR) and the root mean square (rms) phase error is 0.89° at 40 GHz.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2019.2942013