Phase locked loop circuitry with split loop filter

Details Phase locked loop circuitry with split loop filter Phase locked loop circuitry with split loop filter

1993-06-24

1995-01-24

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327564, 327552, H03B 100, H03K 326, H03K 513, G05F 500

Patent

active

053845021

ABSTRACT:
A filter circuit of a phase locked loop circuitry fabricated on a single substrate provides an error voltage proportional to an amount of a phase difference of a comparison of a reference signal and a feedback signal. The filter circuit is coupled to a phase comparator of the phase looked loop circuitry for receiving the comparison of the reference and feedback signals. The filter circuit includes a first capacitor having a first end coupled to an output of the phase comparator and a second end coupled to ground for generating a first error voltage with respect to the amount of the phase difference of the comparison of the reference and feedback signals. The filter circuit also includes a resistor and capacitor circuit that has a first end coupled to the output of the phase comparator and a second end coupled to the ground for generating a second error voltage with respect to the amount of the phase difference of the comparison of the reference and feedback signals. The resistor and capacitor circuit includes a second capacitor and a resistor coupled between the first and second ends of the resistor and capacitor circuit. The capacitances of the first and second capacitors are independent of each other and can be accurately set. An add circuitry is coupled to receive the first error voltage at the first end of the first capacitor and the second error voltage at the first end of the resistor and capacitor circuit for adding the first and second error voltages to generate the error voltage such that the phase locked loop circuitry can operate in a low power supply environment.

REFERENCES:
patent: 4786828 (1988-11-01), Hoffman
patent: 4819081 (1989-04-01), Volk et al.
patent: 4829258 (1989-05-01), Volk
patent: 4940952 (1990-07-01), Kegasa
patent: 5039877 (1991-08-01), Chern

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