A chopper amplifier, comprising: a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency and to output a chopped signal; an amplification stage having an input arranged to receive the chopped signal and an output, wherein the amplification stage is configured to supply an amplified signal at the output; and an output chopper arranged to de-modulate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal of the chopper amplifier, wherein the amplification stage is further configured to filter the signal passing through the amplification stage to attenuate signal components having frequencies lower than the chopper frequency, wherein the amplification stage has a band pass filter behaviour, and includes: a main amplifier; and an inductive circuit, wherein: the main amplifier has a differential voltage input and a differential voltage output and characterized in that: the inductive circuit is connected across the differential voltage output, wherein the inductive circuit comprises a fully differential amplifier configured in unity gain feedback and having a differential input connected to the differential voltage output (324, 326) of the main amplifier, wherein the fully differential amplifier is configured to mimic the desired inductive behaviour to provide the band-pass characteristic of the amplification stage; and the amplification stage further includes: a common mode loop amplifier having outputs connected to the differential voltage input of the main amplifier and arranged to define a common mode output voltage of the main amplifier. a first chopper arranged to modulate an input signal using a first chopper signal having a chopper frequency and to output a chopped signal; an amplification stage having an input arranged to receive the chopped signal and an output, wherein the amplification stage is configured to supply an amplified signal at the output; and an output chopper arranged to de-modulate the amplified signal using a second chopper signal having the chopper frequency to generate an amplified output signal of the chopper amplifier, wherein the amplification stage is further configured to filter the signal passing through the amplification stage to attenuate signal components having frequencies lower than the chopper frequency, wherein the amplification stage has a band pass filter behaviour, and includes: a main amplifier; and an inductive circuit, wherein: the main amplifier has a differential voltage input and a differential voltage output and characterized in that: the inductive circuit is connected across the differential voltage output, wherein the inductive circuit comprises a fully differential amplifier configured in unity gain feedback and having a differential input connected to the differential voltage output (324, 326) of the main amplifier, wherein the fully differential amplifier is configured to mimic the desired inductive behaviour to provide the band-pass characteristic of the amplification stage; and the amplification stage further includes: a common mode loop amplifier having outputs connected to the differential voltage input of the main amplifier and arranged to define a common mode output voltage of the main amplifier. a main amplifier; and an inductive circuit, wherein: the main amplifier has a differential voltage input and a differential voltage output and characterized in that: the inductive circuit is connected across the differential voltage output, wherein the inductive circuit comprises a fully differential amplifier configured in unity gain feedback and having a differential input connected to the differential voltage output (324, 326) of the main amplifier, wherein the fully differential amplifier is configured to mimic the desired inductive behaviour to provide the band-pass characteristic of the amplification stage; and the amplification stage further includes: a common mode loop amplifier having outputs connected to the differential voltage input of the main amplifier and arranged to define a common mode output voltage of the main amplifier. the inductive circuit is connected across the differential voltage output, wherein the inductive circuit comprises a fully differential amplifier configured in unity gain feedback and having a differential input connected to the differential voltage output (324, 326) of the main amplifier, wherein the fully differential amplifier is configured to mimic the desired inductive behaviour to provide the band-pass characteristic of the amplification stage; and the amplification stage further includes: a common mode loop amplifier having outputs connected to the differential voltage input of the main amplifier and arranged to define a common mode output voltage of the main amplifier.