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Digitally programmable decibel-linear CMOS VGA for low-power mixed-signal applications

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2 Author(s)
Elwan, H.O. ; Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA ; Ismail, M.

A new technique for realizing CMOS digitally-controlled decibel-linear variable gain amplifier (VGA) circuits is described. CMOS VGA circuits employing the proposed technique are then given. Besides being effective and simple to use from a system point of view, the VGA circuits offer a stable gain characteristic with precise gain control that is achievable without component spreading. The VGA provides a 25 dB gain control range per stage, with 0.55 dB gain steps and a gain error of less than 0.5 dB. It can also be digitally reconfigured to give a 60 dB gain control range with 6 dB gain steps. The VGA circuit provides digital offset trimming, processes voltage or current input signals and operates in a fully differential configuration. Simulation and experimental results are provided

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:47 ,  Issue: 5 )

Date of Publication:

May 2000

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