Signal processing circuit with offset compensation

Details Signal processing circuit with offset compensation Signal processing circuit with offset compensation

1996-08-12

1999-02-02

Young, Brian K.

Coded data generation or conversion

Converter calibration or testing

341118, H03M 110

Patent

active

058671153

ABSTRACT:
An A/D-converter for a knock determination of an engine performs A/D-conversion with respect to a knock signal having a reference voltage and to another sensor signal having a reference voltage that differs therefrom. When the engine rotation is less than 1000 rpm, since the knock signal is too small to perform malfunction determination, integration of "0" point data (reference voltage: 2.5V) of an integrating circuit is performed within a knock determination time period. The resulting data is A/D-converted by the A/D-converter to thereby update the "0" point value stored in a RAM. On the other hand, in a range of greater than 1000 rpm where malfunction determination can be performed of the knock sensors, within the knock determination time period, the knock signal is integrated using the integrating circuit.

REFERENCES:
patent: 5172115 (1992-12-01), Kerth et al.
patent: 5245340 (1993-09-01), Loo et al.

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