Phase locked loop tracking filter having enhanced attenuation of

Details Phase locked loop tracking filter having enhanced attenuation of Phase locked loop tracking filter having enhanced attenuation of

1975-04-14

1977-02-22

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, H03B 304

Patent

active

040094502

ABSTRACT:
In a tracking filter, which includes a conventional phase locked loop having a phase detector, a filter and a voltage controlled oscillator adapted to track a wanted signal and attenuate unwanted signals and noise from an incoming spectrum of signals, there is provided a phase modulator and an additional filter adapted to attenuate further the unwanted signals and the noise without degrading the ability of the loop to track the wanted signal.

REFERENCES:
patent: 3495184 (1970-02-01), Perkins, Jr. et al.
patent: 3624511 (1971-11-01), Sui
patent: 3740671 (1973-06-01), Crow et al.
patent: 3810036 (1974-05-01), Bloedorn

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