Clock synthesis systems, circuits and methods
First Claim
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1. A clock synthesis system, comprising:
- a feed forward stage including a divider circuit configured to divide a source clock signal by one of a plurality of integers in response to a select signal to generate a reference clock that is synchronous to a synchronization pulse;
a modulator that modulates the select signal in response to at least a difference value;
a multiplier circuit that frequency multiplies the reference clock to generate an output clock, wherein the frequency multiplication of the reference clock is performed by a phase lock loop (PLL) circuit after the division of the source clock signal and the modulation of the select signal; and
a timing circuit that generates the difference value in response to the source clock signal and synchronization pulse.
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Abstract
A clock synthesis system may include a feed forward divider circuit configured to divide a source clock signal by one of a plurality of integers in response to a select signal to generate a reference clock that is synchronous to a synchronous pulse; a modulator that modulates the select signal in response to at least a difference value; a multiplier circuit that frequency multiplies the reference clock to generate an output clock; and a timing circuit that generates the difference value in response to the source clock and synchronous pulse.
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Citations
20 Claims
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1. A clock synthesis system, comprising:
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a feed forward stage including a divider circuit configured to divide a source clock signal by one of a plurality of integers in response to a select signal to generate a reference clock that is synchronous to a synchronization pulse; a modulator that modulates the select signal in response to at least a difference value; a multiplier circuit that frequency multiplies the reference clock to generate an output clock, wherein the frequency multiplication of the reference clock is performed by a phase lock loop (PLL) circuit after the division of the source clock signal and the modulation of the select signal; and a timing circuit that generates the difference value in response to the source clock signal and synchronization pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A clock synthesis system, comprising:
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a frequency synthesis circuit that divides a source clock by different integer values in response to at least a difference between the source clock and a synchronous clock to generate a reference clock, wherein the reference clock is an audio clock capable of being used to process audio data; and a multiplier circuit that generates at least one output clock by frequency multiplying the reference clock, wherein the frequency multiplying of the reference clock is performed by a phase lock loop (PLL) circuit after the division of the source clock; and
whereinthe synchronous clock is slower than the source clock and the reference clock, and the at least one output clock is a rational multiple of, and synchronous with, the synchronous clock. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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dividing a source clock by multiple integer values based on a select signal to generate a reference clock signal that is synchronous with, and a rational multiple of, a synchronization pulse input; modulating the select signal in response to at least a difference value generated in response to a difference between the synchronization pulse input and the source clock; and frequency multiplying and filtering the reference clock signal to generate an output signal, wherein the frequency multiplying and filtering of the reference clock signal is performed by a phase lock loop (PLL) circuit after the dividing of the source clock and the modulating of the select signal. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification