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dB-Linear CMOS Variable Gain Amplifier for GPS Receiver  

Jo, Jun-Gi (Department of Electronics Computer Engineering, Hanyang University)
Yoo, Chang-Sik (Department of Electronics Computer Engineering, Hanyang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.48, no.7, 2011 , pp. 23-29 More about this Journal
Abstract
A dB-linearity improved variable gain amplifier (VGA) for GPS receiver is presented. The Proposed dB-linear current generator has improved dB-linearity error of ${\pm}0.15$dB. The VGA for GPS is designed using proposed dB-linear current generator and composed of 3 stage amplifiers. The IF frequency is assumed as 4MHz and the linearity requirement of the VGA for GPS receiver is defined as 24dBm of IIP3 using cascaded IIP3 equation and the VGA satisfies 24dBm when minimum gain mode. The DC-offset voltage is eliminated using DC-offset cancelation loop. The gain range is from -8dB to 52dB and the dB-linearity error satisfies ${\pm}0.2$dB. The 3-dB frequency has range of 35MHz~106MHz for the gain range. The VGA is designed using 0.18${\mu}m$ CMOS process. The power consumption is 3mW with 1.8V supply voltage.
Keywords
variable gain amplifier; dB-linear gain control; GPS receiver;
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