Ultrahigh frequency active filter

Details Ultrahigh frequency active filter Ultrahigh frequency active filter

1985-03-08

1987-03-03

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 25, 329122, 455296, H03L 700

Patent

active

046478752

ABSTRACT:
The ultrahigh frequency responsive filter according to the invention comprises an ultrahigh frequency oscillator associated with a rapid phase lock loop. The loop comprises a mixer connected with the output of the oscillator and with the output of a synthesizer. A phase comparator receives a band frequency outputted from the mixer and a phase modulated carrier signal to be filtered. The loop also has an amplifier and a low-pass filter circuit receiving the output signal of the phase comparator. The output of the low pass filter is connected with the frequency control input of the oscillator. Thus, the modulated carrier signal is transposed to the frequency of the voltage-controlled oscillator at the same time as it is subject to band pass filtering by the loop. The filter can be used for ultrahigh frequency filtering in directional radio links.

REFERENCES:
patent: 3657661 (1972-04-01), Jarger
patent: 3845396 (1974-10-01), Rutman
patent: 4313209 (1982-01-01), Drucker
patent: 4500851 (1985-02-01), Sawa et al.
K. E. Schertler, "Microwave Power Up-Converters for Angle Modulated Signals Using Phase-Locked Microwave Oscillators", Conf. Proc. of 5th Eur.Mic.Conf., pp. 195-199.
E. Bukkert et al., "Broadband Power Up-Conversion for Microwave Radio Links Using a Phase Locked GaAs Oscillator", Conf.Proc. of 10th Eur.Micr.Conf., pp. 759-763.

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