Passive infrared motion detection circuit having four...

Details Passive infrared motion detection circuit having four... Passive infrared motion detection circuit having four...

G - Physics

08

B

G08B 13/19 (2006.01) G01P 13/00 (2006.01)

Patent

CA 2220804

A simplified analog passive infrared motion detection circuit operates using only four operational amplifiers. A first amplifier is used as part of a bandpass amplifier circuit, a second is used in an inverter circuit, a third is used in an integrator circuit and a fourth is used in a threshold comparator circuit for generating an alarm output signal. The circuit is built using a single quad op amp IC package and is economical to manufacture. The third op amp can alternatively be used as a passive infrared sensor preamplifier and a transistor can be used in the integrator circuit, so that a regulated power supply for the circuit is not needed.

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