Method of operating a differential amplifier arrangement, corresponding differential amplifier, integrated circuit and system

A method of operating an amplifier circuit, comprising:

• during a calibration phase of the amplifier circuit:
• selectively coupling input nodes of the amplifier circuit to a common calibration node and applying a common calibration voltage level thereto;
• iteratively varying at least one adjustment signal based on a programmable control code and applying the iteratively varied at least one adjustment signal to at least one adjustment node of the amplifier circuit;
• sensing a calibration output voltage produced at an output node of the amplifier circuit in response to each iteration of the varying applied at least one adjustment signal;
• performing at least one comparison among an i-th calibration output voltage and an (i+1)-th calibration output voltage;
• based on the at least one comparison, checking whether the (i+1)-th calibration output voltage has a polarity different from a polarity of the i-th calibration output voltage;
• and
• storing a programmed value of the programmable control code based on a positive result of the checking;
• during a first operating phase of the amplifier circuit:
• producing the at least one adjustment signal based on the stored programmed value of the programmable control code;
• applying the at least one produced adjustment signal to the at least one adjustment node;
• and
• selectively decoupling the input nodes of the amplifier circuit from the common calibration node and applying at least one input signal to the input nodes of the amplifier circuit;
• wherein an output signal at the output node of the amplifier circuit is exempt from amplifier offset as a result.