Controlling noise transfer function of signal path to reduce charge pump noise

A method for generating an output signal by a signal path, comprising:

• generating the output signal by an analog signal path portion of the signal path having an audio input for receiving an analog signal, an audio output for providing the output signal, and a selectable analog gain, and configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain, wherein a transfer function of the analog signal path portion has an analog magnitude droop;
• processing a digital input signal in conformity with a selectable digital gain by a digital signal path portion of the signal path having the selectable digital gain and configured to receive and process a digital input signal in conformity with the selectable digital gain, wherein a transfer function of the digital signal path portion has a digital magnitude droop;
• converting the digital input signal, as processed by the digital signal path portion, by a digital-to-analog converter of the signal path into the analog signal;
• compensating for the analog magnitude droop with a first digital compensation filter;
• and
• compensating for the digital magnitude droop with a second digital compensation filter, such that the first digital compensation filter and the second digital compensation filter together compensate for magnitude droop of the signal path to ensure a substantially flat passband response of the signal path;
• wherein:
• the first digital compensation filter comprises a baseband magnitude compensation filter;
• and
• the second digital compensation filter comprises an oversampling rate magnitude compensation filter.