Patent ID: 7741919

Claim:
A voltage controlled oscillator comprising: a current controlled oscillator having a variable frequency output; a first control path for generating a first control current having a first adjustable gain; a second control path for generating a second control current having a second adjustable gain; a summer for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator; and a control sub-circuit for controlling the gain of the first control path as a function of a defined voltage on the second control path to maintain constant the gain of the output of the current controlled oscillator over a given operating range of said current controlled oscillator; and wherein the second control path includes a voltage-to-current converter, said defined voltage is an output voltage of said voltage-to-current converter, and the control sub-circuit applies said output voltage of the voltage-to-current converter to the first control path to control the magnitude of the first control current.