A CMOS VLSI delay oriented waveform converter dedicated to the synthesizer of an UMTS transceiver

Abstract

In this paper we present a waveform converter implemented on a 0.25 /spl mu/m CMOS technology using a dedicated design methodology (delay oriented design). The circuit converts a square wave signal in both in-phase and quadrature-phase sinusoidal differential outputs. It also multiplies the frequency by seven. The output frequency range of this converter extends from 1.05 GHz up to 2.17 GHz. This converter is dedicated for the design of a third generation mobile phone synthesizer using a double loop architecture. For an output frequency of 2 GHz, the measured phase noise at 10 kHz offset from the carrier is -97 dBc/Hz. The circuit consumes 50 mW from a 2.5 V supply.