HIGH FREQUENCY LOW-GAIN NOISE RING-TYPE VCO OSCILLATOR LEADING TO A LOW-NOISE/AREA PLL

摘要

A phase locked loop includes a voltage-controlled oscillator and a current mirror circuit that supplies a drive current to the voltage-controlled oscillator. The current mirror circuit includes a filter between a bias current generator and current mirror transistor. The filter includes a first and a second switch driven in unison with a small duty cycle.