Linear phase detector and clock/data recovery circuit thereof
First Claim
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1. A linear phase detector comprising:
- a data transition detector receiving data signals and configured to determine whether a transition is present in the received data signals;
an up/down pulse generator coupled to said data transition detector and receiving said data signals and a recovered clock signal, said up/down pulse generator generating up and down pulses that have pulse widths proportional to phase differences between transitions of the data signals and edges of the recovered clock signal; and
a multiplexer coupled to said data transition detector and said up/down pulse generator, said multiplexer receiving a selection signal from said transition detector and outputting up and down pulses at transitions of said data signals.
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Abstract
A linear phase detector includes an up/down pulse generator operating in response to received data signals and a recovered clock signal. The phase detector generates up and down pulses that have pulse widths proportional to the phase differences between transitions of the received data signals and edges of the recovered clock signal. By generating up and down pulses using a linear phase detector in proportion to a phase error, data signals are effectively recovered, even data signals with significant jitter.
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Citations
11 Claims
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1. A linear phase detector comprising:
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a data transition detector receiving data signals and configured to determine whether a transition is present in the received data signals; an up/down pulse generator coupled to said data transition detector and receiving said data signals and a recovered clock signal, said up/down pulse generator generating up and down pulses that have pulse widths proportional to phase differences between transitions of the data signals and edges of the recovered clock signal; and a multiplexer coupled to said data transition detector and said up/down pulse generator, said multiplexer receiving a selection signal from said transition detector and outputting up and down pulses at transitions of said data signals. - View Dependent Claims (2, 3, 4, 5)
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6. A clock/data recovery circuit comprising:
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a voltage-controlled oscillator configured to generate a recovered clock signal; a phase detector configured to generate up and down pulses in response to received data signals and said recovered clock signal from said voltage-controlled oscillator, the phase detector further comprising; a data transition detector receiving data signals and configured to determine whether a transition is present in the received data signals; an up/down pulse generator coupled to said data transition detector and said received data signals and said recovered clock signal, said up/down pulse generator generating the up and down pulses that have pulse widths proportional to phase differences between transitions of the data signals and edges of the recovered clock signal; and a multiplexer coupled to said data transition detector and said up/down pulse generator, said multiplexer receiving a selection signal from said transition detector and outputting up and down pulses at transitions of said data signals; and a control circuit configured to control the voltage-controlled oscillator in response to the up and down pulses to synchronize an edge of the recovered clock signal with the center of the data signal, wherein the recovered clock signal comprises multiphase clock signals, and the phase detector generates up and down pulses for each of the multiphase clock signals. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification