Investigation on the Effectiveness of the Dynamic Offset Cancellation to Improve the Immunity of DDAs to EMI

The interference generated by intentional RF sources like WiFi modules as well as the switching noise resulting from the operation of microprocessors can affect that of sensors like microphones and accelerometers placed nearby. Indeed, the interference drives the nonlinear components the readout circuits are made of, so that the output signals are corrupted by the de-modulated interference. The paper focuses on the demodulation of EMI in differential difference amplifiers providing insights on the benefit resulting from the use of dynamic offset compensation circuits.