Patent ID: 6842081
Filing Date: 2005-01-11
Classification: H03B

Abstract:
1. A dual band voltage controlled oscillator comprising: first and second bipolar transistors, each transistor having a collector cross coupled to a base of the other transistor; a common current source connected to supply to emitters of said first and second transistors an operating current; a pair of inductors serially connected between each of said collectors and a power supply terminal; tuning capacitor means connected between each of said collectors for forming a resonant circuit which said inductors at a resonant frequency; a first output terminal connected to one of said collectors to produce a signal having a frequency equal to said resonant frequency; a second output terminal connected to said emitter terminals for producing a harmonic signal which is a multiple of the frequency of said resonant frequency produced by said current source and means for controlling the amount of coupling between said collectors and base connections whereby the level of the harmonic signal is controlled.