A CMOS IF transceiver with 90 dB linear control VGA for IMT-2000 application

Abstract

A prototype IF transceiver has been integrated in 0.35 /spl mu/m CMOS technology. The chip includes VGAs and mixers for IMT-2000. The VGAs are controlled continuously in linear dB by using a proposed quasi-exponential gain control method. Measurements show that both VGAs have over 90 dB dynamic range and 9.5 dB NF in receiver. The -3 dB frequencies of the receiver and transmitter are 250 MHz and 430 MHz, respectively. Thus, the transceiver can adapt to PCS as well as IMT-2000 for potential dual-band application. With a single 3.0 V power supply, the VGAs and mixers consume 16 mA and 6 mA, respectively.