Patent ID: 6483391
Filing Date: 2002-11-19
Classification: H03L

Abstract:
A circuit for maintaining the amplitude of an output signal of a controllable oscillator, comprising:a controllable oscillator configured to venerate an output signal having a predefined frequency and a predefined amplitude, the controllable oscillator having a plurality of operational states responsive to a plurality of control signals, each of the plurality of operational states corresponding to a particular current bias associated with a distinct amplitude of the output signal of the controllable oscillator; and an amplitude control circuit in communication with the controllable oscillator, the control circuit configured to determine the amplitude of the output signal of the controllable oscillator and, when the amplitude of the output signal of the controllable oscillator is less than the predefined amplitude, provide the plurality of control signals to the controllable oscillator, the plurality of control signals configured to change the controllable oscillator to the operational state corresponding to the distinct amplitude that best approximates the predefined amplitude.