DocumentCode :
662074
Title :
A CMOS wideband highly linear variable gain amplifier
Author :
Hoang Viet Le ; Hoa Thai Duong ; Anh Trong Huynh ; Evans, Robin J. ; Skafidas, E.
Author_Institution :
Victoria Res. Lab., Nat. ICT Australia, Melbourne, VIC, Australia
fYear :
2013
fDate :
5-8 Nov. 2013
Firstpage :
694
Lastpage :
696
Abstract :
This work presents the design of a wideband highly linear variable gain amplifier (VGA). The proposed VGA consists of 3 stage digitally gain controlled amplifiers and a fixed gain amplifier. The circuit topologies of the amplifiers are pseudo differential inverter, which allows maximum headroom voltage swing. As a result, highly linear operation is achieved. A simple digitally gain controlled method is proposed, that provides 15 dB control range, with 3 control bits. Furthermore, with the proposed gain control method, linearity and gain bandwidth is maintained in low gain mode operation. The proposed VGA is implemented in a 65 nm CMOS technology. The measured VGA shows more than 1.2 GHz 3 dB gain bandwidth, 15 dB control gain range. The measured VGA consumes 7.5 mA from 1.2 V power supply.
Keywords :
CMOS integrated circuits; digital control; gain control; invertors; network topology; wideband amplifiers; CMOS technology; VGA; circuit topology; current 7.5 mA; digitally gain controlled amplifier; digitally gain controlled method; fixed gain amplifier; gain 15 dB; maximum headroom voltage swing; pseudo differential inverter; size 65 nm; variable gain amplifier; voltage 1.2 V; wideband highly linear amplifier; CMOS integrated circuits; Gain; Gain measurement; Inverters; Linearity; Wideband; CMOS; digital control; gm cell; high linearity; wideband VGA;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
Type :
conf
DOI :
10.1109/APMC.2013.6694948
Filename :
6694948
Link To Document :
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