Oscillators – With frequency adjusting means – With voltage sensitive capacitor
Patent
1996-02-22
1998-01-27
Callahan, Timothy P.
Oscillators
With frequency adjusting means
With voltage sensitive capacitor
331 57, 331108B, 331135, H03B 524
Patent
active
057126011
ABSTRACT:
An oscillation circuit is provided which is easily adjusted with a high degree of accuracy. The oscillation circuit including a filter having a time constant and an inverting amplifier which feeds back the output of the filter to the input side of the filter so that an oscillation condition is fulfilled. The filter includes a gm amplifier formed of a differential amplifier, and a capacitor. The constant current source of the differential amplifier is connected to a free running oscillation frequency adjusting circuit. The adjusting circuit includes a microcomputer, a decoder which decodes the output data of the microcomputer and a switching circuit driven by the output of the decoder and varying the current value according to the output of the decoder. A current in accordance with a current value depending on the setting of the switch flows through the constant current source.
REFERENCES:
patent: 4818952 (1989-04-01), Kawano et al.
patent: 5142249 (1992-08-01), Hirotomi
patent: 5206609 (1993-04-01), Mijuskovic
patent: 5384553 (1995-01-01), Takeda et al.
patent: 5406631 (1995-04-01), Takeda et al.
patent: 5450039 (1995-09-01), Takeda et al.
patent: 5552749 (1996-09-01), Nowatski et al.
Shimada Yoshikazu
Takeda Isoshi
Callahan Timothy P.
Luu An T.
Rohm & Co., Ltd.
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