Differential charge pump for phase locked loop circuits

Details Differential charge pump for phase locked loop circuits Differential charge pump for phase locked loop circuits

1997-03-18

1998-11-03

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 25, 327157, H03L 7089

Patent

active

058314849

ABSTRACT:
A differential charge pump is provided for use with phase locked loop (PLL) circuits including a differential loop filter and a common mode bias circuit for maintaining a predetermined bias voltage value on a high voltage filter side of the loop filter. The differential charge pump includes a reference current source. First and second current mirrors are coupled to the reference current source for providing a first mirror current and a second mirror current. A first switching transistor coupled to the first current mirror receives an input UP signal conducts current from a first side of the loop filter. A second switching transistor coupled to the second current mirror receives an input DOWN signal and conducts current from a second side of the loop filter. The first and second current mirror and switching transistors are formed by N-channel metal oxide semiconductor (NMOS) devices. The differential charge pump enables a large differential output voltage with low phase error.

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IBM Technical Disclosure Bulletin R.D. Gilligham, J.F. Mikos, and J.D. Strom; vol. 33, No. 9, Feb. 1991; pp. 332-333 Differential Charge Pump.
IBM Technical Disclosure Bulletin M.B. Ebler, JMA W. Siljenberg and J.T. Trnka; vol. 33, No. 4, Sep. 1990; pp. 252-254 Charge Pump.

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