Patent ID: 7728631

Claim:
A phase frequency detector comprising: a detection circuit operable to receive a reference signal and a feedback signal, wherein the detection circuit is operable to generate a first control signal based, at least in part, on the reference signal, and generate a second control signal based, at least in part, on the feedback signal, wherein the detection circuit is operable to change a state of the first control signal from a first state to a second state in response to the reference signal transitioning from a first state to a second state, and change a state of the second control signal from a first state to a second state in response to the feedback signal transitioning from a first state to a second state; and a reset circuit operable to generate a reset signal based, at least in part, on the first control signal, the second control signal, and the feedback signal, wherein the reset circuit is operable to change a state of the reset signal from a first state to a second state in response to the first control signal transitioning from the first state to the second state, the second control signal transitioning from the first state to the second state, and the feedback signal transitioning from the second state to the first state, wherein the reset circuit is operable to provide the reset signal to the detection circuit to reset the detection circuit.