Infrared ray sensor driving circuit

Details Infrared ray sensor driving circuit Infrared ray sensor driving circuit

1994-12-16

1996-11-26

Fields, Carolyn E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 250DIG1, G01J 510

Patent

active

055788254

ABSTRACT:
An improved infrared ray sensor driving circuit capable of advantageously controlling an amplifying level and a cut-off frequency of a filter by separating the functions of an amplifier and a filter, respectively. The circuit includes an impedance matching circuit for converting a high impedance of the signals detected to a low impedance signal, a first amplifying circuit for amplifying signals outputted from the impedance matching circuit by a first predetermined gain, a filtering circuit for filtering the signals outputted from the first amplifying circuit to pass frequencies of a predetermined bandwidth, and a second amplifying circuit for amplifying the signals outputted from the filtering circuit by a second predetermined gain.

REFERENCES:
patent: 3792272 (1974-02-01), Harte et al.
patent: 3988726 (1976-10-01), Reiss et al.

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