Receiver frequency synthesizer-tuner providing high speed tuning

Details Receiver frequency synthesizer-tuner providing high speed tuning Receiver frequency synthesizer-tuner providing high speed tuning

1996-10-11

1998-03-24

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 17, 331 25, 4551832, 4551841, 4551861, H03L 7087, H04B 116

Patent

active

057317410

ABSTRACT:
An apparatus for acquiring tuning for a tuning frequency at a high speed. In a receiver, a tuning control unit holds inputted tuning frequency information at a designated address in accordance with a storage designation signal supplied from a control unit and controls the frequency of a VCO based on the tuning frequency information held at a designated address in accordance with a read designation signal supplied from the control unit. Further, in a frequency comparison loop including a frequency comparator for acquiring a frequency difference between a target tuning frequency and the VCO frequency, a count time setting circuit sets the count time for measuring the VCO frequency, and the count time is increased whenever measurement of the VCO frequency is repeated.

REFERENCES:
patent: 5450621 (1995-09-01), Kianush et al.
patent: 5525935 (1996-06-01), Joo et al.

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