A circuit for expanding a dynamic range. In one embodiment, the circuit includes: a transducer generating a signal current on an output terminal in response to a physical quantity, the signal current comprising an AC current and a DC current; a dynamic range enhancement circuit having a digital control signal input terminal and producing a variable opposition current in response to a digital signal applied to the digital control signal input terminal; an amplifier; an analog to digital converter in electrical communication with the amplifier; and a digital feedback circuit in communication with the output terminal of the analog to digital converter and in electrical communication with the digital control signal input terminal of the dynamic range enhancement circuit, wherein the opposition current from the dynamic range enhancement circuit is set substantially equal to the DC current portion of the signal current from the transducer.