Patent ID: 7103127

Claim:
A frequency synthesizer circuit, comprising: a controllable oscillator configured to generate an output signal having a predefined frequency, the controllable oscillator having a plurality of operational states responsive to a plurality of control signals, each of the plurality of operational states defining a distinct frequency for the output signal of the controllable oscillator; and a frequency control circuit in communication with the controllable oscillator, the frequency control circuit configured to determine the distinct frequency for the output signal that best approximates the predefined frequency and to provide the plurality of control signals, the plurality of control signals configured to change the controllable oscillator to the operational state corresponding to the distinct frequency that best approximates the predefined frequency, wherein the frequency control circuit comprises a frequency detector configured to determine the frequency of the output signal, a comparator configured to compare the frequency of the output signal to the predefined frequency, and logic configured to determine which of the plurality of distinct frequencies for the output signal corresponding to the plurality of operational states best approximates the predefined frequency.