An integrated low power one-pin crystal oscillator

This paper presents a one-pin crystal oscillator realized in a standard 0.35-mum CMOS technology. Based on a three point oscillator topology, the single one-pin crystal oscillator core circuit is designed to operate over a supply voltage range of 1.62 V to 3.63 V, a temperature range from -10degC to 60degC in both fundamental and overtone modes. It allows a wide range of oscillation frequencies from 32 kHz (fundamental) to 50 MHz (3^rd overtone). The current consumption of the oscillator core is 102.1 muA at 32 kHz and 8.421 mA at 30 MHz. It produces both a sinusoidal and a square wave output. The overall oscillator circuit is able to drive a large output load which is the combination of 12 pF capacitance and 1 MOmega resistance. Performance of the crystal oscillator in corner simulations is also observed.