A High-Performance Iμm CMOS Current Controlled Oscillator

A simple fully symmetrical current controlled relaxation oscillator is presented. The oscillator is based on a novel two capacitor architecture. This fully symmetrical architecture permits relatively large capacitor voltage waveform amplitudes, thus minimising jitter. The use of a fast double differential latching comparator allows high speed operation, with good control linearity. The circuit was successfully fabricated in the 1 micron ADCIS analog CMOS process.