Multi-standard carrier generator with CMOS logic divider

Abstract

A multi standard carrier generator chain satisfying all requirements of phase noise and frequency range for Quad-band GSM/EDGE and WCDMA standards is presented. It adopts a VCO utilizing bond-wire inductors with high-quality factor, an 8-bit coarse tune capbank for low VCO gain. CMOS logic dividers are also adopted in this LO chain to meet the most stringent phase noise specification of GSM. The proposed divider structure also shows very wide tuning range of self oscillation frequency(0.54 to 2.44GHz). The proposed LO chain is implemented in 0.13 µm CMOS technology. The measured tuning range is about 22% (3.25 to 4.05 GHz). The LO chain exhibits a phase noise of −126, −136 and −164dBc/Hz measured respectively at 400KHz, 1MHz and 20MHz offset from 900MHz Carrier.