A miniaturized 35 GHz 65‐nm CMOS digital‐controlled differential variable gain amplifier

This paper presents a 35 GHz differential variable gain amplifier (VGA) with 4‐bit digital‐controlled gain‐tuning using 65‐nm CMOS process. Using the proposed miniaturized differential matching inductors, a core size of the VGA is only 0.53  × 0.26 mm. The digital gain control mechanism is achieved...

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Bibliographic Details
Published in:Microwave and optical technology letters 2022-01, Vol.64 (1), p.90-96
Main Authors: Cheng, Wei‐Chung, Tsai, Zuo‐Min
Format: Article
Language:English
Subjects:
CMOS 65‐nm
digital‐controlled VGA
Ka‐band
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Summary:This paper presents a 35 GHz differential variable gain amplifier (VGA) with 4‐bit digital‐controlled gain‐tuning using 65‐nm CMOS process. Using the proposed miniaturized differential matching inductors, a core size of the VGA is only 0.53  × 0.26 mm. The digital gain control mechanism is achieved using the digital version current steering topology. The measured gain control range of the VGA is from 17.4 to 9 dB at 35 GHz with 16 different linear‐in‐dB gain states. Thus, this work achieves the maximum peak gain per unit core size and maintains a much better gain control range per unit core size. The measured root mean square gain error is
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.33055