Patent ID: 7786812
Filing Date: 2010-08-31
Classification: H03B,H03L

Abstract:
1. An apparatus comprising: a reference oscillator configured to provide a first signal having a first frequency, the reference oscillator comprising at least one variable capacitor having a selected capacitance in response to a control signal; a temperature sensor configured to generate a second signal in response to temperature; a frequency controller coupled to the temperature sensor and to the reference oscillator, the frequency controller configured to provide the control signal in response to the second signal to maintain the first frequency within a predetermined frequency range over a predetermined temperature variation; a frequency divider coupled to the reference oscillator and configured to provide an output reference signal having an output frequency determined from the first frequency and a divide value; and at least one controlled reactance module electrically coupled to the reference oscillator, said at least one controlled reactance module responsive to a coefficient to switch a reactance of the controlled reactance module to the reference oscillator.