Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2006-04-11
2006-04-11
Nguyen, Long (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C307S652000
Reexamination Certificate
active
07026844
ABSTRACT:
The present invention provides a sensor signal detection device which allows the improvement of reliability. This sensor signal detection device comprises an internal power supply voltage generation circuit, a buffer amplifier for receiving signals from a sensor, a first pull-up element and pull-down element which are connected to an input terminal of the buffer amplifier via a first pair of switches, a gain amplifier for receiving output signals of the buffer amplifier, a second pull-up element and pull-down element which are connected to an input terminal of the gain amplifier via a second pair of switches, and a failure inspection circuit for inspecting buffer amplifier and gain amplifier by controlling the connection of the two pairs of switches in a predetermined sequence, and measuring the voltage at a predetermined location when power is started up.
REFERENCES:
patent: 3836790 (1974-09-01), Becker
patent: 4446427 (1984-05-01), Lovrenich
patent: 4572966 (1986-02-01), Hepworth
patent: 5367265 (1994-11-01), Gaudette
patent: 2001-171344 (2001-06-01), None
Arent & Fox PLLC
Nguyen Long
Rohm & Co., Ltd.
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