Patent ID: 7026844
Filing Date: 2006-04-11
Classification: B60N,H03K

Abstract:
1. A sensor signal detection device, comprising: an internal power supply voltage generation circuit for generating an internal power supply voltage from a power supply voltage; a first amplifier for receiving at an input terminal thereof positive and negative pulse signals from a sensor; a first pull-up element for pulling up the input terminal of the first amplifier to the internal power supply voltage; a first pull-down element for pulling down the input terminal of the first amplifier to a ground potential; a first pair of switches for electrically connecting the first pull-up element or the first pull-down element to the input terminal of the first amplifier; a second amplifier for receiving at an input terminal thereof output signal of the first amplifier; a second pull-up element for pulling up the input terminal of the second amplifier to the internal power supply voltage; a second pull-down element for pulling down the input terminal of the second amplifier to the ground potential; a second pair of switches for electrically connecting the second pull-up element or the second pull-down element to the input terminal of the second amplifier; and a failure inspection circuit for controlling the connection of said first and second pair of switches in a predetermined sequence and measuring the internal power supply voltage when power supply is started up, so as to inspect said first and second amplifiers.