| 摘要 |
In an amplifying circuit, an amplifier receives an input signal via a first resistor unit, and generates an output signal at an output thereof. A second resistor unit is connected between the output and input of the amplifier, and has at least one control input. The second resistor unit has a variable equivalent impedance that is controlled by a control signal received at the control input. A feedback control unit receives the output signal from the amplifier, and is operable so as to provide the control signal to the control input of the second resistor unit when the output signal does not fall within a voltage range defined by a predetermined low voltage and a predetermined high voltage to adjust the variable equivalent impedance of the second resistor unit.
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