Patent ID: 7982539

Claim:
A gain circuit to generate fine tuning of gain steps, the gain circuit comprising: an analog section comprising an input terminal and an output terminal; wherein: the analog section is used to receive an analog input signal at the input terminal of the analog section and generate an analog output signal at the output terminal of the analog section, the analog section is used to control the analog output signal at the output terminal of the analog section with coarse tuning of the analog input signal, the coarse tuning comprises a first set of gain steps, and the first set of gain steps correspond to the analog section; the output terminal of the analog section is coupled to an input terminal of the digital section; and a digital section comprising the input terminal and an output terminal; wherein: the digital section is used to generate a digital output signal at the output terminal of the digital section; and the digital section is used to control the digital output signal at the output terminal of the digital section with fine tuning of the analog output signal, the fine tuning comprises a second set of gain steps, the second set of gain steps corresponds to the digital section, and wherein a first gain step resolution corresponding to the second set of gain steps is greater than a second gain resolution corresponding to the first set of gain steps.