Amplifiers – With semiconductor amplifying device – Including atomic particle or radiant energy impinging on a...
Patent
1999-03-01
2000-05-09
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including atomic particle or radiant energy impinging on a...
330310, H03F 308
Patent
active
060609524
ABSTRACT:
The present invention aims to avoid mutual interference of outputs of passive infrared detectors in an amplifier circuit of an infrared sensor to be amplified by a single system of amplifier circuit by cyclically switching outputs from a plurality of passive infrared detectors at a predetermined cycle. P.sub.1 and P.sub.2 each represents a passive infrared detector, and switches 2.sub.1 and 2.sub.2 can be switched over cyclically. Between an operational amplifier 12 and an operational amplifier 13, series circuits of capacitors and switches are provided in parallel as many as the passive infrared detectors. Switches 20.sub.1 and 20.sub.2 are opened and closed in synchronization with the switches 2.sub.1 and 2.sub.2 respectively. The capacitor C.sub.30 is used when an output from the passive infrared detector P.sub.1 is amplified, and a capacitor C.sub.31 is used when an output from the passive infrared detector P.sub.2 is amplified. Thus, it is possible to avoid the interference of the outputs of the passive infrared detectors P.sub.1 and P.sub.2 with each other.
REFERENCES:
patent: 4232272 (1980-11-01), Fabri
patent: 4593250 (1986-06-01), Lucas et al.
patent: 5006814 (1991-04-01), Wilson
patent: 5942946 (1999-08-01), Su et al.
Atsumi Electric Co., Ltd.
Choe Henry
Pascal Robert
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