Patent ID: 7639097

Claim:
A method of operating an oscillator circuit, the method comprising: providing a resonator, a first programmable load capacitor, a second programmable load capacitor, and an amplifier having an input and an output, wherein the first programmable load capacitor is coupled to the input, the second programmable load capacitor is coupled to the output, and the resonator is coupled between the input and the output; providing a timer for asserting a control signal for a predetermined time period in response to an enable signal; programming both the first and second programmable load capacitors to have a first capacitance value for a predetermined time period during startup of the oscillator circuit; providing a first bias current to the amplifier during the predetermined time period in response to the control signal being asserted; reprogramming the first and second programmable load capacitors to have a second capacitance value greater than the first capacitance value after the predetermined time period; and providing a second bias current to the amplifier after the predetermined time period in response to the control signal being deasserted, wherein the second bias current is less than the first bias current.