Patent ID: 7449971

Claim:
A transistor oscillating circuit having a reduced oscillating frequency dependency upon power supply voltage changes, comprising: an oscillating transistor having an emitter, a collector, and a base, the emitter coupled to ground through an emitter load resistor, the collector connected to a power supply terminal, the base coupled to the collector through a first bias resistor and to the emitter through a second bias resistor; a resonance circuit coupled with the base of the oscillating transistor, wherein the first bias resistor, the second bias resistor, and the emitter load resistor are directly connected in series between the power supply terminal and the ground; a first feedback capacitor coupled from the base of the oscillating transistor to a connection point between the second bias resistor and the emitter load resistor; and a second feedback capacitor coupled from the connection point between the second bias resistor and the emitter load resistor to the ground.