Patent ID: 7443258

Claim:
An oscillatory system, comprising: a first microelectromechanical resonator to generate a first output signal having a frequency that varies with operating temperature, wherein the first microelectromechanical resonator includes a first frequency function of temperature of the first microelectromechanical resonator; a second microelectromechanical resonator to generate a second output signal having a frequency that varies with operating temperature, wherein the second microelectromechanical resonator includes a second frequency function of temperature of the second microelectromechanical resonator; frequency manipulation circuitry, coupled to the first and second microelectromechanical resonators to generate a third signal having frequency that is substantially stable over a predetermined range of operating temperatures using the first and the second frequency function of temperature to cancel at least a first-order temperature dependent term of the first and second output signals, exclusive of the use of temperature sensing means separate from the first and second microelectromechanical resonators; and control circuitry configured to: receive the third signal from the frequency manipulation circuitry, based on the third signal and exclusive of the use of any temperature sensing means apart from the first and second microelectromechanical resonators, generate temperature data, and based on the temperature data, adjust operation of at least the first microelectromechanical resonator or the second microelectromechanical resonator.