Amplifier circuit for infrared sensor
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United States of America Patent
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May 9, 2000
Grant Date -
N/A
app pub date -
Mar 1, 1999
filing date -
Nov 2, 1998
priority date (Note) -
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status (Latency Note)
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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.
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