[paper]A High Dynamic Range CMOS Variable Gain Amplifier for Mobile

teradyne

A High Dynamic Range CMOS Variable Gain Amplifier for Mobile DTV Tuner

Jianhong Xiao,Student Member,IEEE, Iuri Mehr, Member, IEEE, and Jose Silva-Martinez, SeniorMember,IEEE
IEEE JOURNALOF SOLID-STATE CIRCUITS,VOL. 42,NO. 2,FEBRUARY 2007

Abstract—A high dynamic range RF variable gain amplifier
(RFVGA) suitable for mobile digital television (DTV) tuners is
presented. Variable gain is achieved using a capacitive attenuator
and current-steering transconductance stages, which pro-
vide high linearity with relatively low power consumption.A novel
broadband input impedance matching scheme based on resistive
shunt-feedback is proposed. This scheme allows the RFVGA to
achieve a low noise figure. A gain control technique suitable for
CMOS current-steering variable gain amplifiers is described; it
features1dBperstepresolution,independentofprocessandtem-
perature variations. The chip is fabricated in six-metal 0.18um
CMOS technology and consumes 12.2 mA current from 1.8 V
supply. The RFVGA achieves 16 dB maximum gain, 33 dB gain
control range, a 4.3 dB noise figure, and an IIP3 higher than
25 dBm.

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eetime999

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Variable Gain Amplifier

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