Amplifier circuit having controllable output stage
AssigneeMediatek Inc.
InventorsSung-Han Wen, Ya-Chi Chen
Life of this patent
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Abstract
The present invention provides an amplifier circuit, wherein the amplifier circuit includes a DAC, an output stage and a detector. In the operations of the amplifier circuit, the DAC is arranged for performing a digital-to-analog converting operation upon a digital input signal to generate an analog signal, the output stage is arranged for receiving the analog signal to generate an output signal, and the detector is arranged for detecting a characteristic of the input signal, and referring to the characteristic of the input signal to generate at least one control signal to adjust the output stage at a zero-crossing point of the output signal.
Claims20
An amplifier circuit, comprising:
- a digital-to-analog converter (DAC), for performing a digital-to-analog converting operation upon a digital input signal to generate an analog signal;
- an output stage, coupled to the DAC, for receiving the analog signal to generate an output signal;
- and
- a detector, coupled to the output stage, for detecting a characteristic of the input signal, and referring to the characteristic of the input signal to generate at least one control signal to adjust a quiescent current of the output stage at a zero-crossing point of the output signal.
An amplifier circuit, comprising:
- a delay circuit, for delaying an input signal to generate a delayed input signal;
- an output stage, coupled to the delay circuit, for receiving the delayed input signal to generate an output signal;
- and
- a detector, coupled to the output stage, for detecting a characteristic of the input signal, and referring to the characteristic of the input signal to generate at least one control signal to adjust a quiescent current of the output stage at a zero-crossing point of the output signal.
Dependencies are inferred from the claim text.