| 摘要 |
In some embodiments, an apparatus includes an amplifier circuit and a bias circuit coupled to the amplifier. The amplifier circuit includes an input port and an output port, an input port circuit element coupled to the input port, an output port circuit element coupled to the output port, and an internal signal path to couple the input port circuit element to the output port circuit element. The output port is coupled to the input port, the bias circuit, and the internal signal path. In some embodiments, a method includes receiving an input signal at an input port of an amplifier, processing the input signal to produce an output signal at an output port of the amplifier, controlling bandwidth in the amplifier by feeding back the output signal to an internal signal path in the amplifier, controlling biasing in the amplifier by coupling the output signal to a bias circuit coupled to the amplifier, and controlling input impedance in the amplifier by coupling the input port to the output port through an impedance.
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