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US 6,670,852 B1Granted
Oscillator tuning method
AssigneeCypress Semiconductor Corporation
InventorLane T. Hauck
Life of this patent
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Abstract
An apparatus comprising an output circuit and a control circuit. The output circuit may be configured to generate an output signal oscillating at a frequency in response to a control signal. The control circuit may be configured to generate the control signal in response to (i) a frequency of said input signal when in a first mode and (ii) a stored value when in a second mode.
Claims23
An apparatus comprising:
- a first circuit configured to generate an output signal oscillating at a first frequency in response to a first control signal;
- and
- a second circuit configured to (a) receive a calibration signal oscillating at a second frequency and (b) generate said first control signal in response to (i) a counter value when in a first mode and (ii) a stored value when in a second mode, wherein, while in said first mode, said counter value is adjusted in response to a difference between said first frequency and said second frequency.
An apparatus comprising:
- means for generating an output signal oscillating at a first frequency in response to a control signal;
- and
- means for generating said control signal in response to (i) a counter value when in a first mode and (ii) a stored value when in a second mode, wherein, while in said first mode, said counter value is adjusted in response to a difference between said first frequency and a second frequency of a calibration signal.
A method for tuning an oscillator, comprising the steps of:
- (A) detecting the presence of an input signal oscillating at a first frequency;
- (B) generating an output signal oscillating at a second frequency in response to a control signal;
- and
- (C) calibrating said control signal when said input signal is present in response to a counter value, wherein said counter value is adjusted in response to a difference between said first frequency and said second frequency.
1 more element
Dependencies are inferred from the claim text.