Patent ID: 6271734
Filing Date: 2001-08-07
Classification: H03B

Abstract:
A piezoelectric oscillator comprising:a Colpitts oscillator including a piezoelectric resonator and an oscillation transistor;amplification means for amplifying an output of said Colpitts oscillator; andrectification means for rectifying an output of said amplification means, an output of said rectification means being fed back to base of said oscillation transistor to keep an oscillation output level constant,wherein a base bias is set so as to provide said oscillation transistor with an operation point located in the vicinity of a saturation region, andwherein a feedback current from the rectification means is supplied to the base of the oscillation resistor so as to make the operation point approach to the saturation region when the saturation output level has become high and so as to make the operation point go away from the saturation region when the oscillation output level has become low.