Patent ID: 6545555
Filing Date: 2003-04-08
Classification: H03B

Abstract:
A differential voltage controlled oscillator, comprising:a differential oscillator core having a first output that is capacitively coupled to a first differential input thereof by a first semiconductor junction having a first non-linear capacitance and a second output that is capacitively coupled to a second differential input thereof by a second semiconductor junction having a second non-linear capacitance; a first linear capacitor electrically cross-coupled from the first differential input to the second output; a second linear capacitor electrically cross-coupled from the second differential input to the first output; a first phase noise reduction device having a first non-linear capacitance characteristic, electrically cross-coupled from the first differential input to the second output; and a second phase noise reduction device having a second non-linear capacitance characteristic, electrically cross-coupled from the second differential input to the first output.