| 摘要 |
The present invention provides a signal processor including a microprocessor for generating and supplying a control signal pulse train, a gain control circuit having a first switching device opened/closed by the control signal pulse train and resistors for determining an amplification factor with respect to a signal voltage as input and varying the resistances of the resistors in response to a pulse duty of the control signal pulse train, thereby controlling the amplification factor with respect to the signal voltage as input, and a switched capacitor filter circuit having second switching devices opened/closed by the control signal pulse train and a charging/discharging capacitor connected to the second switching devices, thereby adjusting filter characteristics in response to the pulse frequency of the control signal pulse train. The control signal pulse train is supplied commonly to the first and second switching devices.
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