Frequency divider circuit and frequency synthesizer using the sa

Details Frequency divider circuit and frequency synthesizer using the sa Frequency divider circuit and frequency synthesizer using the sa

1986-09-09

1987-07-07

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

3072191, 328 16, 331 25, 375120, 377 47, 455120, H03L 704

Patent

active

046790039

ABSTRACT:
A wide band analog frequency divider circuit operable at a high frequency in the GHz band, and a frequency synthesizer utilizing the analog frequency divider circuit. The analog frequency divider circuit comprises an LC series circuit having a capacitor and an inductor connected between the anode and the cathode of a diode, and means for applying a forward bias to the diode. The input signal is supplied from the anode side of the diode, and the output is delivered from the cathode side, or the anode side of the cathode is grounded. The frequency synthesizer is arranged to frequency divide the output of a VCO by the analog frequency divider circuit, and to supply the frequency-divided output to a prescaler. The output of the prescaler is further frequency divided by a programmable divider, and the phase difference between the output of the programmable divider and a reference signal is detected thereby to control the oscillation frequency of the VCO.

REFERENCES:
patent: 4392253 (1983-07-01), Yamada et al.
patent: 4631496 (1986-12-01), Borras et al.

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