A one pin crystal oscillator for satellite tuner

with all load capacitance integrated on chip has been realized.Due to the structure of the oscillation and the use of MOS gate capacitance for the load capacitance

the chip area can be very small.Based on 0.18um CMOS technology

the chip area is 0.023mm2.This oscillator can work in 2 modes: crystal outside mode and source outside mode.When the oscillator work in crystal outside mode

it generates rail to rail sine wave

and the start time of oscillation less than 1ms.And it allowed 0.1V.3V sine source in when it works in source outside mode.