Abstract: A differential interface circuit includes a differential amplifier circuit, a common-mode feedback circuit and a feedback initialization circuit. The differential amplifier circuit is configured to receive and amplify a differential input signal so as to produce an amplified differential output signal. The common-mode feedback circuit is configured to estimate a common-mode level of the differential output signal, to produce a feedback value in response to the estimated common-mode level, and to adjust the differential amplifier circuit using the feedback value. The feedback initialization circuit is configured, in response to detecting that the differential input signal is in a range predefined as abnormal, to temporarily override the common-mode feedback circuit, and instead set the feedback value applied to the differential amplifier circuit to a predefined initialization value.

Abstract: A circuit for generating an output current and a method for generating an output current are provided. A voltage generator circuit is configured to generate at least two voltages. A digital circuit is configured to generate a pulse width modulation signal having a waveform characteristic that is controllable based on bits of configuration data received by the digital circuit. An averaging circuit is configured to receive the pulse width modulation signal and generate a bias voltage that comprises a weighted average of the at least two voltages. Weights of the at least two voltages are based on the waveform characteristic of the pulse width modulation signal. A voltage-controlled current source is configured to generate an output current based on the bias voltage.