Method and circuit for rapid alignment of signals
First Claim
1. A circuit for aligning two or more signals including a first and a shifted copy of a second signal, the circuit comprising:
- a first gate coupled to a first delay block, the first gate configured for receiving the first signal and a power down signal;
a second gate coupled to a second delay block, the second gate configured for receiving a shifted copy of the second signal and the power down signal;
a first flip-flop configured for receiving the first signal and an output from the second delay block;
a second flip-flop configured for receiving the shifted copy of the second signal and an output from the first delay block;
a third gate configured for receiving an output from the first flip-flop and an output from the second flip-flop; and
a fourth gate configured for receiving an output from the third gate and the power down signal and providing a circuit output signal.
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Accused Products
Abstract
Circuits and methods for aligning two or more signals including a first and second signal. In one embodiment, a shift register generates two or more shifted copies of the second signal, and each of a plurality of phase detectors receives the first signal and one of the shifted copies of the second signal, each phase detector providing an output indicating whether the first signal is substantially aligned with the shifted copy of the second signal. A multiplexer may also be provided for receiving each of the shifted copies of the second signal, the multiplexer having a plurality of select lines coupled with the output signals of the phase detectors. Some embodiments may include a power saving mode.
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Citations
10 Claims
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1. A circuit for aligning two or more signals including a first and a shifted copy of a second signal, the circuit comprising:
- a first gate coupled to a first delay block, the first gate configured for receiving the first signal and a power down signal;
a second gate coupled to a second delay block, the second gate configured for receiving a shifted copy of the second signal and the power down signal;
a first flip-flop configured for receiving the first signal and an output from the second delay block;
a second flip-flop configured for receiving the shifted copy of the second signal and an output from the first delay block;
a third gate configured for receiving an output from the first flip-flop and an output from the second flip-flop; and
a fourth gate configured for receiving an output from the third gate and the power down signal and providing a circuit output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a first gate coupled to a first delay block, the first gate configured for receiving the first signal and a power down signal;
Specification