Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2008-01-25
2010-06-08
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
Reexamination Certificate
active
07733139
ABSTRACT:
A delay locked loop circuit includes a phase-frequency detector, a sampler, a charge pump, a bias generator and a voltage-controlled element. The phase-frequency detector outputs at least one difference signal by detecting a phase difference between an input clock signal and a feedback clock signal. The sampler outputs at least one sampled signal by delaying the difference signal in accordance with the input clock signal. The charge pump generates a control voltage in accordance with the sampled signal. The bias generator generates at least one bias voltage in accordance with the control voltage. The voltage-controlled element is controlled with the bias voltage to output the feedback clock signal to the phase-frequency detector in accordance with the input clock signal. A method for eliminating jitter and offset between an input clock signal and an output clock signal in a delay locked loop circuit is also disclosed.
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Donovan Lincoln
Himax Technologies Limited
Houston Adam D
Rabin & Berdo P.C.
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