Techniques for phase adjustment
First Claim
1. A dynamic phase alignment circuit comprising:
- a phase generator circuit comprising delay-locked loop circuits operable to generate periodic output signals, wherein each of the delay-locked loop circuits is operable to generate one of the periodic output signals in response to at least two periodic input signals;
a multiplexer circuit operable to provide a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals;
a phase detection circuit operable to compare a phase of the selected periodic signal to a data signal to generate a phase detection signal; and
a first control logic circuit operable to generate the select signals, wherein the first control logic circuit is operable to adjust the select signals based on changes in the phase detection signal to cause the multiplexer circuit to adjust the phase of the selected periodic signal,wherein each of the delay-locked loop circuits comprises a shift register operable to cause a delay provided to a first delayed signal to vary based on a phase comparison between the first delayed signal and a first one of the periodic input signals, and wherein a second one of the periodic input signals is delayed to generate the first delayed signal.
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Abstract
A dynamic phase alignment circuit includes a phase generator circuit having delay-locked loop circuits that generate periodic output signals. Each of the delay-locked loop circuits generates one of the periodic output signals in response to at least two periodic input signals. A multiplexer circuit selects a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals. A phase detection circuit compares a phase of the selected periodic signal to a data signal to generate a phase detection signal. A control logic circuit generates the select signals. The control logic circuit adjusts the select signals based on changes in the phase detection signal to cause the multiplexer circuit to adjust the phase of the selected periodic signal.
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Citations
33 Claims
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1. A dynamic phase alignment circuit comprising:
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a phase generator circuit comprising delay-locked loop circuits operable to generate periodic output signals, wherein each of the delay-locked loop circuits is operable to generate one of the periodic output signals in response to at least two periodic input signals; a multiplexer circuit operable to provide a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals; a phase detection circuit operable to compare a phase of the selected periodic signal to a data signal to generate a phase detection signal; and a first control logic circuit operable to generate the select signals, wherein the first control logic circuit is operable to adjust the select signals based on changes in the phase detection signal to cause the multiplexer circuit to adjust the phase of the selected periodic signal, wherein each of the delay-locked loop circuits comprises a shift register operable to cause a delay provided to a first delayed signal to vary based on a phase comparison between the first delayed signal and a first one of the periodic input signals, and wherein a second one of the periodic input signals is delayed to generate the first delayed signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A circuit comprising:
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a phase comparator circuit operable to generate a phase comparison signal in response to a first delayed signal and a first periodic input signal; a shift register comprising storage circuits operable to generate delay control signals, wherein the storage circuits are operable to update the delay control signals in response to the phase comparison signal; and a delay chain comprising adjustable delay circuits, wherein delays of the adjustable delay circuits are operable to vary based on changes in the delay control signals, and wherein the delay chain is operable to delay a second periodic input signal to generate the first delayed signal, wherein each of the adjustable delay circuits in the delay chain comprises a first pass gate coupled between a first capacitor and an output node of the adjustable delay circuit and a second pass gate coupled between a second capacitor and the output node of the adjustable delay circuit, and wherein the first and the second pass gates are controlled by the delay control signals. - View Dependent Claims (12, 13, 14, 15)
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16. A circuit comprising:
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a phase comparator circuit operable to generate a phase comparison signal in response to a first delayed signal and a first periodic input signal; a shift register comprising storage circuits operable to generate delay control signals, wherein the storage circuits are operable to update the delay control signals in response to the phase comparison signal; and a delay chain comprising adjustable delay circuits, wherein delays of the adjustable delay circuits are operable to vary based on changes in the delay control signals, and wherein the delay chain is operable to delay a second periodic input signal to generate the first delayed signal, wherein the phase comparator circuit comprises; a first flip-flop comprising a first input operable to receive the first periodic input signal and a second input operable to receive the first delayed signal; a second flip-flop comprising a first input operable to receive the first periodic input signal and a second input operable to receive an output signal of the first flip-flop; a third flip-flop comprising a first input operable to receive the first periodic input signal and a second input operable to receive an output signal of the second flip-flop; and a first logic gate circuit comprising a first input operable to receive the output signal of the first flip-flop, a second input operable to receive the first periodic input signal, and a third input operable to receive an output signal of the third flip-flop. - View Dependent Claims (17, 18, 19)
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20. A circuit comprising:
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a phase comparator circuit operable to generate a phase comparison signal in response to a first delayed signal and a first periodic input signal; a shift register comprising storage circuits operable to generate delay control signals, wherein the storage circuits are operable to update the delay control signals in response to the phase comparison signal; and a delay chain comprising adjustable delay circuits, wherein delays of the adjustable delay circuits are operable to vary based on changes in the delay control signals, and wherein the delay chain is operable to delay a second periodic input signal to generate the first delayed signal, wherein the phase comparator circuit comprises; a first flip-flop comprising a first input operable to receive the first periodic input signal and a second input operable to receive the first delayed signal; and a second flip-flop comprising a first input operable to receive the first periodic input signal and a second input operable to receive a second delayed signal, wherein the first delayed signal is inverted to generate the second delayed signal, wherein the shift register comprises a first input that is responsive to an output signal of the first flip-flop and a second input that is responsive to an output signal of the second flip-flop.
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21. A method comprising:
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generating periodic output signals in response to periodic input signals using delay-locked loops, wherein each of the delay-locked loops generates one of the periodic output signals based on at least two of the periodic input signals, and wherein each of the delay-locked loops comprises a shift register that causes a delay provided to a first delayed signal to vary based on a phase comparison between the first delayed signal and a first one of the periodic input signals, and wherein a second one of the periodic input signals is delayed to generate the first delayed signal; selecting a selected periodic signal from among the periodic input signals and the periodic output signals based on select signals; comparing a phase of the selected periodic signal to a data signal to generate a phase detection signal; and generating the select signals and adjusting the select signals based on changes in the phase detection signal in order to cause an adjustment in the phase of the selected periodic signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A method comprising:
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comparing phases of a first delayed signal and a first periodic input signal to generate a phase comparison signal; generating delay control signals by shifting signals through a shift register; updating the delay control signals based on the phase comparison signal; adjusting delays of delay circuits coupled in a delay chain based on the delay control signals; and generating the first delayed signal in response to a second periodic input signal using the delay chain, wherein comparing phases of a first delayed signal and a first periodic input signal to generate a phase comparison signal comprises; storing a first stored signal in response to the first delayed signal and the first periodic input signal; storing a second stored signal in response to the first stored signal and the first periodic input signal; storing a third stored signal in response to the second stored signal and the first periodic input signal; and generating the phase comparison signal by performing a logic function on the first stored signal, the first periodic input signal, and the third stored signal. - View Dependent Claims (30, 31, 32, 33)
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Specification