AFC circuit for a frequency scanning receiver

Details AFC circuit for a frequency scanning receiver AFC circuit for a frequency scanning receiver

1997-12-10

2000-08-22

Pham, Chi H.

Pulse or digital communications

Receivers

Automatic frequency control

375316, 4551922, 455136, H04L 2706

Patent

active

061083879

ABSTRACT:
In a frequency scanning receiver having an AFC function, when a desired signal is caught by frequency scanning due to VCO, to which a scanning voltage from a scanning signal oscillator is applied, the scanning is stopped. At this time, an operating circuit calculates to form a setting voltage of the VCO at the convergence of the AFC, based on two voltages, which are the control voltage (scanning voltage) applied to the VCO and an output voltage of a frequency error detector, and the AFC circuit is made function after having applied this setting voltage to the VCO.
In this way, it is possible to shorten a header of a packet signal and to improve through-put of data, which can be transmitted, by removing a remaining frequency error in a short period of time, when the frequency scanning is stopped, by the fact that an object signal is caught by the frequency scanning.

REFERENCES:
patent: 4955083 (1990-09-01), Phillips et al.
patent: 5263195 (1993-11-01), Panther et al.
patent: 5717721 (1998-02-01), Kawai
patent: 5822373 (1998-10-01), Addy

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