Compensation of local oscillator phase jitter
First Claim
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1. A method for generating a local oscillator output, the method comprising:
- receiving an intermediate frequency input, a reference clock input, and a local oscillator feedback input, the intermediate frequency input received from an analog-to-digital converter, and the local oscillator feedback input received from a tuner;
filtering the reference clock input to produce a filtered version of the reference clock input;
generating a phase error correction signal based at least in part on the filtered version of the reference clock input and a phase of the local oscillator feedback input;
generating the local oscillator output based at least in part on the intermediate frequency input and the phase error correction signal; and
providing the local oscillator output.
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Abstract
Digital logic circuitry is disclosed. The circuitry includes local oscillator drift and phase compensation logic that compensates the frequency drift and the phase noise of a local oscillator generated by a digitally controlled oscillator.
81 Citations
20 Claims
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1. A method for generating a local oscillator output, the method comprising:
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receiving an intermediate frequency input, a reference clock input, and a local oscillator feedback input, the intermediate frequency input received from an analog-to-digital converter, and the local oscillator feedback input received from a tuner; filtering the reference clock input to produce a filtered version of the reference clock input; generating a phase error correction signal based at least in part on the filtered version of the reference clock input and a phase of the local oscillator feedback input; generating the local oscillator output based at least in part on the intermediate frequency input and the phase error correction signal; and providing the local oscillator output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for recovering information from a communications channel, the method comprising:
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receiving the communications channel, an intermediate frequency, a reference clock input, and a local oscillator feedback input; generating a filtered version of the reference clock input; generating a phase error correction signal based at least in part on the filtered version of the reference clock input and a phase of the local oscillator feedback input; generating the local oscillator output based at least in part on the intermediate frequency input and the phase error correction signal; down converting the communications channel to the intermediate frequency based at least in part on the local oscillator output; and determining a digital representation of the down converted communications channel at least in part by sampling the down converted communications channel. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification