Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1991-08-12
1993-01-19
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 49, 331 57, 331135, 331143, 331179, H03B 520, H03L 700
Patent
active
051809915
ABSTRACT:
An RC oscillator for varying an oscillation frequency which has a counter for counting a clock pulse of the oscillation frequency and for outputting a counted value in a form of a plurality of bits to an output terminal. It also includes a standard capacitor, a plurality of capacitors having a capacitance value in proportion to a weight of bits outputted from the counter, and a plurality of switches connected to one end of each capacitor for selectively connecting the capacitors in parallel. A plurality of first gate circuits control the switches connected thereto in response to an output of the counter, each first gate circuit has an input terminal connected to an output terminal of the counter and an output terminal connected to a control terminal of the switches. A second gate circuit turns on the switches independently of the output of the counter in the case of a frequency adjustment of the oscillation signal, the second gate circuit has an input terminal connected to a predetermined output terminal of the counter and an output terminal connected to a switch for use of the standard capacitor.
REFERENCES:
patent: 4156205 (1979-05-01), Kadin et al.
patent: 5053723 (1991-10-01), Schemmel
Grimm Siegfried H.
Manzo Edward D.
OKI Electric Industry Co., Ltd.
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