Patent ID: 6946924

Claim:
A voltage controlled oscillator circuit, comprinsing: an autotransformer having a positive terminal, a negative terminal, center tap terminal, a positive input terminal, and a negative input terminal, where the positive input terminal is located between the positive terminal and the center tap terminal, and the negative input terminal is located between the center tap terminal an the negative terminal; a first voltage controlled variable capacitor having a positive terminal connected to an input and a negative terminal connected to a positive terminal of the autotransformer; a second voltage controlled variable capacitor having a positive terminal connected to the input and a negative terminal connected to the negative terminal of the autotransformer; a first transistor having a collector; a second transistor having a collector; a first emitter resistor connected between the emitter of the first transistor and the positive input terminal of the autotransformer; a second emitter resistor connected between the emitter of the second transistor transistor and the negative input terminal of the autotransformer; a first coupling capacitor connected between the positive terminal of the autotransformer and the base of the first transistor; a second coupling capacitor connected between the negative terminal of the autotransformer and the base of the second transistor; a first base bias resistor connected between the base of the first transistor and the voltage bias input; and a second base bias resistor connected between the base of the second transistor and the voltage bias input.