Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1996-04-26
1997-03-04
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 2, 331 4, 331 20, 331DIG2, 327145, 327146, 327151, 327155, 327160, 360 51, H03L 700
Patent
active
056083556
ABSTRACT:
An automatic adjustment circuit for an oscillator converts an output from a register into an analog signal by means of a D/A converter. An oscillation frequency of an oscillator is controlled by an output of the D/A converter. A first counter for counting an oscillation signal of the oscillator 1 resets itself and generates a pulse when a count reaches a predetermined value. A second counter counts a reference frequency pulse having a frequency substantially higher than the oscillation frequency of the oscillator. The second counter, on completion of counting a given preset value, changes an output level. The second counter is preset by said first counter when the first counter resets itself. Outputs from the first and the second counters are processed by an AND operation in an AND circuit. A third counter counts an output from the AND circuit, and provides a count output to the register.
REFERENCES:
patent: 4470025 (1984-09-01), Baker
patent: 4614917 (1986-09-01), Zelitzki et al.
patent: 5382921 (1995-01-01), Estrada et al.
patent: 5406592 (1995-04-01), Baumert
patent: 5459435 (1995-10-01), Taki
Mis David
Rohm & Co., Ltd.
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