Analog signal conditioning circuit having feedback offset cancellation

A feedback circuit for compensating for DC offset variations in an analog output signal of an analog signal conditioning circuit having an amplifier, an input for receiving an analog input signal, and an output for providing an amplified output signal, said feedback circuit comprising:

• an analog-to-digital converter coupled to the output of the amplifier for converting the analog signal to a digital signal;
• a digital controller coupled to the analog-to-digital converter for processing the digital signal to compensate for offset in the analog output signal, wherein the digital controller computes an offset signal as the difference between the digital signal and a reference signal applied to the amplifier and generates a processed digital feedback signal to compensate for the determined offset;
• and
• a digital-to-analog converter coupled to an output of the digital controller for converting the compensated digital signal to an analog feedback signal, wherein the feedback signal is applied as an input to the amplifier to compensate for DC offset in the analog output signal.