Patent ID: 7015734

Claim:
An apparatus comprising: a charge pump configured to generate an output signal in response to both a pump up signal and a pump down signal, said charge pump including (i) a pull up current source configured to generate a second pull up signal and (ii) a pull down current source configured to generate a second pull down signal; a pair of first current sources configured to generate a pair of intermediate signals controlled by said pump up signal and said pump down signal, respectively; a logic circuit configured to generate a reset signal in an active state in response to both of said intermediate signals; a first switch configured to switch a first pull up signal generated by said first current sources to said logic circuit in response to said pump up signal; and a second switch configured to switch a first pull down signal generated by said first current sources to said logic circuit in response to said pump down signal, wherein said first pull up signal is smaller than said second pull up signal and said first pull down signal is smaller than said second pull down signal.