Low voltage fully differential CMOS voltage mode digitally controlled variable gain amplifier

In this paper, a voltage mode variable gain amplifier (VGA) is presented. A fully differential implementation is used to suppress the common mode noise and increase the dynamic range. The gain of the proposed VGA can be digitally controlled from 0 to 53dB, with a 1dB resolution. The gain control is...

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Bibliographic Details
Published in:Microelectronics 2000-02, Vol.31 (2), p.139-146
Main Authors: El-Adawy, A.A., Soliman, A.M., Elwan, H.O.
Format: Article
Language:English
Subjects:
Differential output third intercept point
Gain control
Voltage mode variable gain amplifier
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Summary:In this paper, a voltage mode variable gain amplifier (VGA) is presented. A fully differential implementation is used to suppress the common mode noise and increase the dynamic range. The gain of the proposed VGA can be digitally controlled from 0 to 53dB, with a 1dB resolution. The gain control is performed in two stages; coarse control with a 6dB resolution and fine control with a 1dB resolution. Simulation shows that the bandwidth is about 15MHz at the maximum gain (53dB). The differential output third intercept point (OIP3) is 4V.
ISSN:1879-2391
0026-2692
1879-2391
DOI:10.1016/S0026-2692(99)00104-4