A 1.2 GHz Bandwidth Baseband Analog Circuit in 65nm CMOS for Millimeter-Wave Radio

Abstract

This paper presents a wide-bandwidth baseband analog (BBA) amplifier circuit in 65 nm CMOS for 5G mm-wave radio applications. The BBA is composed of an input buffer with dc offset cancellation (DCOC), four-stage variable gain amplifiers (VGAs), and 50-ohm driving output buffers. All blocks are designed in differential to enhance the common mode rejection. The DCOC is based on a body-bias control method for mitigating conflict with the gain control part. Designed in 65nm CMOS, the performances are assessed through post-layout simulations. The BBA consumes 30.2 mW from a 1.2 V supply. The total gain range is 6.2 - 34.5 dB. The bandwidth varies from 1.2 to 2.2 GHz across the total gain tuning range. The entire layout size is 0.053 mm2,