J.C. Patents
Speed-up charge pump and phase-locked loop and method for operating the same
A speed-up charge pump includes a first charge pump for receiving an up signal and a down signal in digital form to produce a first voltage control signal at an output node. Further, at least one speed-up phase detector includes a first circuit path to receive the up signal and delay the up signal by a predetermined delay as a delay up signal and operate the up signal and the delay up signal by AND logic into an auxiliary up signal; and a second circuit path to receive the down signal and delay the down signal by the predetermined delay as a delay down signal and operate the down signal and the delay down signal by AND logic into an auxiliary down signal. A second charge pump is respectively receiving the auxiliary up and down signals to produce a second voltage control signal also at the output node.
UNITED MICROELECTRONICS CORP.
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inventional inventional additional
Cheng-Yang Kun-Yuan Ruei-Yau Yu-Lin Chien-Fu Wei-Jen
Tsai Wu Chen Chen Chen Wang