High output impedance charge pump for PLL/DLL

High output impedance charge pump for PLL/DLL

  • CN 101,677,244 A
  • Filed: 12/10/2004
  • Published: 03/24/2010
  • Est. Priority Date: 12/11/2003
  • Status: Active Application
First Claim
Patent Images

1. charge pump comprises:

  • Pull-up circuit produces pull-up current to improve the voltage of charge pump output place, and this charge pump is by described output and ring wave filter electric connection;

    Pull-down circuit produces pull-down current to reduce the voltage of described output place;

    AndReference current source, have a plurality of selection transistors and a plurality of current mirror main transistor, described current mirror main transistor be coupled in described pull-up circuit and the described pull-down circuit in the selected circuit from transistor so that described from transistor mirror image go out variable current.

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