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US 2009/0289700 A1Published application
Forwarded clock filtering
AssigneeIntel Corporation
InventorsBryan K. Casper, Timothy Hollis, James E. Jaussi, Stephen R. Mooney, Frank O'Mahony, Mozhgan Mansuri
Life of this patent
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Abstract
Some embodiments include a tunable bandpass filter to provide a filtered output signal; a circuit portion to provide an output signal in response to the filtered output signal; a comparator circuit to provide a comparison signal in response to the output signal from the circuit portion; and a feedback circuit to tune the tunable bandpass filter in response to the comparison signal provided by the comparator circuit. Other embodiments are described and claimed.
Claims16
A circuit comprising:
- a tunable bandpass filter to provide a filtered output signal;
- a circuit portion to provide an output signal in response to the filtered output signal;
- a comparator circuit to provide a comparison signal in response to the output signal from the circuit portion;
- and
- a feedback circuit to tune the tunable bandpass filter in response to the comparison signal provided by the comparator circuit.
2 more elements
A circuit comprising:
- a tunable bandpass filter to provide a filtered output signal;
- a detector to provide a signal indicative of a magnitude of the filtered output signal;
- a comparator circuit to provide a comparison signal indicative of comparing a first sample of the magnitude of the filtered output signal with a second sample of the magnitude of filtered output signal, wherein the first sample is previous in time to the second sample;
- and
- a feedback circuit to tune the tunable bandpass filter in response to the comparison signal provided by the comparator circuit.
2 more elements
A circuit comprising:
- a tunable bandpass filter to provide a filtered output signal;
- a phase rotator to provide an output signal, wherein the output signal is synchronized to the filtered output signal and has a phase angle relative to the filtered output signal;
- a comparator comprising a first input port to have a first input voltage and a second input port to have a second input voltage, wherein the comparator is coupled to the phase rotator to provide a comparison signal indicative of a comparison between the first and second input port voltages during a transition of the phase rotator output signal from LOW to HIGH and from HIGH to LOW;
- and
- a feedback circuit to tune the tunable bandpass filter in response to the comparison signal.
2 more elements
Dependencies are inferred from the claim text.