A 90 dB 1.32 mW 1.2 V 0.13 mm2 Two-Stage Variable Gain Amplifier in 0.18 µm CMOS

Quoc-Hoang DUONG  Jeong-Seon LEE  Sang-Hyun MIN  Joong-Jin KIM  Sang-Gug LEE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.5   pp.806-808
Publication Date: 2008/05/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.5.806
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
variable gain amplifier (VGA),  automatic gain control (AGC),  amplifier,  analog circuit,  transceiver,  

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Summary: 
An all CMOS variable gain amplifier (VGA) which features wide dB-linear gain range per stage (45 dB), low power consumption (1.32 mW), small chip size (0.13 mm2), and low supply voltage (1.2 V) is described. The dB-linear range is extended by reducing the supply voltage of the conventional V-to-I converter. The two-stage VGA implemented in 0.18 µm CMOS offers 90 dB of gain variation, 3 dB bandwidth of greater than 21 MHz, and max/min input IP3 and P1 dB, respectively, of -5/-42 and -12/-50 dBm.