Sensor output processing device having self-diagnosis function

Details Sensor output processing device having self-diagnosis function Sensor output processing device having self-diagnosis function

2005-09-06

2005-09-06

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

C324S537000, C340S660000

Reexamination Certificate

active

06940290

ABSTRACT:
A sensor output processing device has an amplifier circuit for amplifying a sensor output signal of a sensor and a buffer circuit for limiting the amplified signal to a high limit level lower than a high side voltage of a power source or a low limit level higher than a low side voltage of the power source. This limited signal is normally produced as an output signal to an external circuit. When a self-diagnosis circuit determines an abnormality in the sensor or in the amplifier circuit and the buffer circuit, the output signal is fixed to a level higher than the high limit level or lower than the low limit level.

REFERENCES:
patent: 5296997 (1994-03-01), Betton et al.
patent: 5734269 (1998-03-01), Sakai et al.
patent: 5847260 (1998-12-01), Nagahara
patent: 6040779 (2000-03-01), Pfaff et al.
patent: 6518880 (2003-02-01), Tanizawa

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