| 摘要 |
A gain control amplifier is provided including: a non-inverting amplifier receiving an input voltage and a direct current reference voltage, and non-inverting amplifying and outputting an alternating component of the input voltage using a predetermined voltage gain based on the direct current reference voltage; and an offset compensator removing a direct current offset component from an output voltage of the non-inverting amplifier using at least two operational amplifiers. The non-inverting amplifier includes: a ladder-shaped resistor varying the voltage gain according to a digital control signal input from an external source.
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