Zero phase error switched-capacitor phase locked loop filter

Details Zero phase error switched-capacitor phase locked loop filter Zero phase error switched-capacitor phase locked loop filter

1995-03-13

1997-08-19

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 14, 327156, 327337, 333173, H03L 7093

Patent

active

056592698

ABSTRACT:
A loop filter for a phase locked loop (PLL) circuit may include two operational amplifiers and switched-capacitors connecting the inverted input and output of the operational amplifiers, the switched-capacitors replacing resistors found in conventional loop filters for PLL circuits. The loop filter may be in a monolithic integrated circuit, and the PLL circuit may operate with a response time heretofore available only with individual (non-IC) components. Phase error due to amplifier offset may be reduced with offset nulling techniques.

REFERENCES:
patent: 4496858 (1985-01-01), Smith
patent: 4616185 (1986-10-01), van Roermund
patent: 4857778 (1989-08-01), Hague
patent: 4987373 (1991-01-01), Soo
patent: 5327092 (1994-07-01), Inogai et al.
patent: 5376891 (1994-12-01), Kirchlechner

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