A LOW-POWER FULLY INTEGRATED GAUSSIAN-MSK MODULATOR BASED ON THE SIGMA-DELTA FRACTIONAL-N FREQUENCY SYNTHESIS

Abstract

ABSTRACT A fully integrated GMSK modulator in DRRS band is presented. All components of the transmitter except the power amplifier, including the loop filter and the oscillator are on-chip. Transistor and system level simulations demonstrate that the modulator meets the performance requirements of the DRRS standard. The circuit power consumption of the modulator at 1.4GHz is 37mW with a single 3V power supply, in a 0.6µm digital CMOS technology. Low power consumption of the modulator is due to the low-power frequency divider and low-power low-phase noise ring oscillator