SINGLE-END AMPLIFIER AND NOISE CANCELLING METHOD THEREOF

摘要

A single-end amplifier includes: a noise cancelling circuit, coupled to a power supply, configured to receive a power signal and to cancel a part of ripples and noises in the power signal to generate an initial signal; an amplifying circuit, configure to receive the initial signal at a first end of the amplifying signal, and to amplify the initial signal to generate a first signal at a second end; and a first transmitting circuit, configured to receive the power signal and to generate a second signal at the second end of the amplifying circuit. The first signal and the second signal are superimposed and outputted to cancel most part of the ripples and noises in the power signal. The noise cancelling circuit includes a first capacitor and a first choke coil.

主权项

1. A single-end amplifier, comprising:
a noise cancelling circuit, coupled to a power supply, configured to receive a power signal and to generate an initial signal; an amplifying circuit, having a first end and a second end, the first end coupled to the noise cancelling circuit, the amplifying circuit configured to receive the initial signal and to amplify the initial signal to generate a first signal at the second end; and a first transmitting circuit, coupled between the power supply and the second end of the amplifying circuit, configured to receive the power signal and to generate a second signal at the second end of the amplifying circuit; wherein, the noise cancelling circuit comprises a first capacitor and a first choke coil; the first capacitor has a first end coupled to the power signal, and a second end coupled to the first end of the amplifying circuit and grounded via the first choke coil; the first signal and the second signal are superimposed at the second end of the amplifying circuit and outputted to cancel ripples and noises in the power signal.