A 95-dB linear low-power variable gain amplifier

An all-CMOS variable gain amplifier (VGA) that adopts a new approximated exponential equation is presented. The proposed VGA is characterized by a wide range of gain variation, temperature-independence gain characteristic, low-power consumption, small chip size, and controllable dynamic gain range....

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 2006-08, Vol.53 (8), p.1648-1657
Main Authors: Quoc-Hoang Duong, Quoc-Hoang Duong, Quan Le, Quan Le, Chang-Wan Kim, Chang-Wan Kim, Sang-Gug Lee, Sang-Gug Lee
Format: Article
Language:English
Subjects:
Amplifier
analog
automatic gain control (AGC)
Circuits
CMOS technology
Digital control
Disk drives
Dynamic range
Equations
Gain control
Linearity
Multiaccess communication
transceiver
variable gain amplifier (VGA)
Voltage control
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Summary:An all-CMOS variable gain amplifier (VGA) that adopts a new approximated exponential equation is presented. The proposed VGA is characterized by a wide range of gain variation, temperature-independence gain characteristic, low-power consumption, small chip size, and controllable dynamic gain range. The two-stage VGA is fabricated in 0.18-mum CMOS technology and shows the maximum gain variation of more than 95 dB and a 90-dB linear range with linearity error of less than plusmn 1 dB. The range of gain variation can be controlled from 68 to 95 dB. The P1dB varies from - 48 to - 17 dBm, and the 3-dB bandwidth is from 32 MHz (at maximum gain of 43 dB) to 1.05 GHz (at minimum gain of - 52 dB). The VGA dissipates less than 3.6 mA from 1.8-V supply while occupying 0.4 mm 2 of chip area excluding bondpads
ISSN:1549-8328
1057-7122
1558-0806
DOI:10.1109/TCSI.2006.879058