Sensor apparatus

Details Sensor apparatus Sensor apparatus

2005-08-09

2005-08-09

Williams, Howard L. (Department: 2819)

Coded data generation or conversion

Sample and hold

C331S185000, C327S291000

Reexamination Certificate

active

06927711

ABSTRACT:
The present invention relates to a sensor apparatus capable of outputting an accurate sensor signal irrespective of a variation of power supply voltage. In the sensor apparatus, when an A/D conversion circuit produces and outputs digital data, a switch circuit is placed into a first switching condition so that a constant voltage is applied from a constant-voltage circuit to an oscillation circuit, and a stabilized oscillation frequency is outputted from the oscillation circuit to the A/D conversion circuit. Thus, even if a power supply voltage varies, the A/D conversion circuit carries out sampling processing on analog data on the basis of the stabilized oscillation frequency from the oscillation circuit to produce and output the digital data.

REFERENCES:
patent: 6593823 (2003-07-01), Nakamiya et al.
patent: 2003/0064694 (2003-04-01), Oka et al.
patent: 11-44585 (1999-02-01), None
patent: 11-64135 (1999-03-01), None
patent: 11-311559 (1999-11-01), None
patent: 2003-179492 (2003-06-01), None

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