Phase-locked-loop with linear combination of charge pump and cur

Details Phase-locked-loop with linear combination of charge pump and cur Phase-locked-loop with linear combination of charge pump and cur

1996-09-24

1997-11-11

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375376, 331 1R, 331 25, 327157, H03D 324

Patent

active

056872011

ABSTRACT:
A phase-locked-loop (PLL) has a current controlled oscillator (ICO) whose gain varies with its input current. The PLL also contains a charge pump that controls the input current of the ICO and therefore the output frequency of the ICO. The charge pump has a gain that is controlled by the ICO input current in a manner which linearizes the combination of charge pump and ICO. This results in a substantially constant loop gain for a PLL.

REFERENCES:
patent: 5008637 (1991-04-01), Ray
patent: 5144156 (1992-09-01), Kawasaki
patent: 5334953 (1994-08-01), Mijuskovic
patent: 5399995 (1995-03-01), Kardontchik et al.

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