Self-calibrating oscillator system
AssigneeFreescale Semiconductor, Inc.
InventorsNihal J. Godambe, Walter H. Kehler
Life of this patent
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Abstract
A system comprising a voltage controlled oscillator is disclosed. The voltage controlled oscillator includes a single input, a power input, and an oscillation input. The oscillation input is coupled to a amplitude detection device, which in turn provides an indication of an amplitude of the output of the VCO to a threshold detect module. Based upon the threshold detected at the threshold detect module, a threshold indicator is provided to a voltage supply module. The voltage supply powering the voltage controlled oscillator is varied, based upon a value of the threshold indicator.
Claims25
A system comprising:
- a signal controlled oscillator comprising a signal input, a power input, and an oscillation output;
- a rectifier comprising an input coupled to the oscillation output, and a reference output to provide a rectified signal;
- a threshold detect module comprising a first input coupled to the reference output, and a threshold indicator output;
- and
- a voltage supply module comprising a select input coupled to the threshold indicator output, and a voltage supply output coupled to the power input of the signal controlled oscillator to supply one of a plurality of voltages based on a value received at the select input.
A method comprising:
- monitoring within a System On a Chip (SOC) device an oscillation output of a signal controlled oscillator of the SOC device to determine an operating condition of the signal controlled oscillator;
- selecting within the SOC a first supply voltage to provide the signal controlled oscillator when the operating condition is in a first state when a rectified representation of the oscillation output is below a threshold value;
- and
- selecting within the SOC a second supply voltage to provide the signal controlled oscillator when the operating condition is in a second state.
A method comprising:
- monitoring an oscillation output of a signal controlled oscillator to determine an operating condition of the signal controlled oscillator;
- selecting a first supply voltage to provide the signal controlled oscillator when the operating condition is in a first state, wherein the operating condition is in the first state when a rectified representation of the oscillation output is below a threshold value;
- and
- selecting a second supply voltage to provide the signal controlled oscillator when the operating condition is in a second state, wherein the operating condition is in the second state when the rectified representation of the oscillation output is above the threshold value.
Dependencies are inferred from the claim text.