Digital control for analog phase locked loop

Details Digital control for analog phase locked loop Digital control for analog phase locked loop

1989-02-27

1990-03-27

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03L 710

Patent

active

049124340

ABSTRACT:
A phase locked loop including a digital control is provided. A phase detector having first and second inputs and an output connected to a loop filter which responds to the digital control so as to modify the output. The loop filter further comprises apparatus for integrating and a first apparatus for amplifying the modified phase detector output, each of which provides an output signal. An apparatus for digitally controlling the loop filter parameters responds to externally generated digital commands so as to vary loop parameters. A first apparatus for generating a voltage controlled oscillation signal is connected to the first input, where the voltage controlled oscillation apparatus includes a voltage control signal input. Further included is a second apparatus for generating a voltage control signal responsive to the sum of the output signals of the integrating apparatus and first amplifying apparatus, where the second generating apparatus transmits the voltage control signal to the voltage control signal input of the first generating apparatus so as to control the oscillation frequency. In one embodiment of the invention, the digital control apparatus comprises a digital-to-analog converter which responds to externally generated digital signals to provide a variable resistance so as to correspondingly change the natural frequency and damping of the phase locked loop in response to the external digital signals.

REFERENCES:
patent: 4243941 (1981-01-01), Zdunek
patent: 4495475 (1985-01-01), Mark et al.
patent: 4506232 (1985-03-01), Thompson
patent: 4546329 (1985-10-01), Unger

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