| 摘要 |
An amplifier is provided to offer a gain variation of a wide band by installing an attenuator for bypassing on a rear end of the amplifier. An amplifier includes a common source amplifying unit(230), and a distortion attenuation unit(220). The common source amplifying unit has a first amplifying unit(231), a second amplifying unit(233), a first feedback unit(232), and a second feedback unit(234). The first amplifying unit receives a positive input signal. The second amplifying unit receives a negative input signal. The distortion attenuation unit is arranged at an output terminal of the common source amplifying unit, and attenuates the distortion of the signal. The first feedback unit has a first resistor unit and a first switching unit. The first resistor unit is coupled to an output terminal of the second amplifying unit and the input terminal of the first amplifying unit. The first switching unit is coupled to the first resistor unit in parallel. The second feedback unit has a second resistor unit and a second switching unit. The second resistor unit is coupled to an input terminal of the second amplifying unit and an output terminal of the first amplifying unit. The second switching unit is coupled to the second resistor unit in parallel. |
