Analog input signal processing circuit

Details Analog input signal processing circuit Analog input signal processing circuit

2007-08-28

2007-08-28

Vo, Hieu T. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

Reexamination Certificate

active

11353052

ABSTRACT:
A signal voltage, which a variable analog signal source generates, is inputted to a microprocessor via a gain adjustment circuit, a switched capacitor filter circuit, and an analog comparison circuit. The microprocessor that cooperates with a program memory generates a control signal pulse train of a variable period and a variable duty. Filter characteristics are adjusted with a period of the control signal pulse trains CNTa and CNTb, and gain is adjusted with a pulse duty. Even if a comparison reference voltage of the analog adjustment circuit is a fixed value, it is possible to make virtual change and adjustment of a comparison reference voltage by adjusting a gain of the gain adjustment circuit. As a result, it is possible to provide an analog input signal processing circuit capable of individually adjusting input filter characteristics and input gain.

REFERENCES:
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patent: 4580221 (1986-04-01), Isobe et al.
patent: 7010419 (2006-03-01), Abe et al.
patent: 05-306645 (1993-11-01), None
patent: 11-205113 (1999-07-01), None
patent: 2002-016460 (2002-01-01), None
patent: 2002-130043 (2002-05-01), None

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