Fully differential signal conditioning circuit for current excitation sensors

The invention relates to the field of sensor detection, and in particular to a fully differential signal conditioning circuit for current excitation sensors, comprising a signal receiving unit, a programmable gain unit, an anti-aliasing filtering unit and an analog-to-digital conversion unit. All are connected in the above listed order. The signal receiving unit is used for receiving the signals outputted from the sensor, isolating DC components and outputting the signals. The programmable gain unit is used for outputting the AC signals outputted from the signal receiving unit as differential signals after being amplified or reduced. The anti-aliasing filtering unit is used for filtering high-frequency interference signals and outputting the signals as differential signals. The analog-to-digital conversion unit converts the received differential signals into digital signals before they are outputted. With a fully differential mode adopted in the whole signal flow of the invention, any part of the signal trans