| 摘要 |
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.
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