Patent ID: 8203392

Claim:
A supply circuit for providing a designated supply voltage at a supply terminal of an oscillator for powering the oscillator, the oscillator configured to produce a periodic signal having a specified frequency, the supply circuit comprising: an amplifier powered by a first supply voltage, wherein a first input terminal of the amplifier is configured to receive a stable reference voltage, and wherein an output of the amplifier is configured to couple to the supply terminal of the oscillator, wherein the designated supply voltage is a voltage developed at the output of the amplifier; and a control circuit coupled to a second input terminal of the amplifier, to the output of the amplifier, and to a voltage reference, wherein when the supply circuit is providing the designated supply voltage at the supply terminal, the control circuit is configured to vary the value of the designated supply voltage at a specific rate with respect to change in temperature as the temperature changes to stabilize the specified frequency of the periodic signal across variations in temperature; wherein the amplitude of the periodic signal is a function of the stable reference voltage.