An amplifier system having a circuit comprising: a first differential amplifier; first and second choppers (chop1, chop2) for chopping the input and the output of the first differential amplifier (gm 1), respectively, An autozero circuitry comprising a first and second switch (S1,S2),a second differential amplifier (gm 2) and two capacitors (C i1,C i2) is electrically coupled to the first differential amplifier for autozeroing the first differential amplifier, the autozero circuitry operating at a first frequency and the choppers operating at a second frequency, the first frequency being twice the second frequency and having a duty cycle of less than 50%; Wherein the amplifier is configured such that each half cycle of the choppers is interrupted by the auto-zeroing circuitry. the first chopper (chop1) being electrically coupled to the first and second differential inputs of the amplifier system, the first-switch having a first first-switch state coupling the differential inputs of the first differential amplifier to differential outputs of the first chopper, and a second first-switch state connecting the differential inputs of the first differential amplifier together; the second differential amplifier, said second differential amplifier having differential inputs, each connected to a circuit ground through a respective one of said capacitors; The differential outputs of the first and second differential amplifiers being electrically coupled in common; an output amplifier having an input electrically coupled to an output of the second chopper (chop2); the second-switch having a first second-switch electrically coupling the common outputs of the first and second differential amplifiers to the inputs of the second chopper, and a second second-switch state coupling the common outputs of the first and second differential amplifiers to the differential inputs of the second differential amplifier. a first differential amplifier; first and second choppers (chop1, chop2) for chopping the input and the output of the first differential amplifier (gm 1), respectively, An autozero circuitry comprising a first and second switch (S1,S2),a second differential amplifier (gm 2) and two capacitors (C i1,C i2) is electrically coupled to the first differential amplifier for autozeroing the first differential amplifier, the autozero circuitry operating at a first frequency and the choppers operating at a second frequency, the first frequency being twice the second frequency and having a duty cycle of less than 50%; Wherein the amplifier is configured such that each half cycle of the choppers is interrupted by the auto-zeroing circuitry. the first chopper (chop1) being electrically coupled to the first and second differential inputs of the amplifier system, the first-switch having a first first-switch state coupling the differential inputs of the first differential amplifier to differential outputs of the first chopper, and a second first-switch state connecting the differential inputs of the first differential amplifier together; the second differential amplifier, said second differential amplifier having differential inputs, each connected to a circuit ground through a respective one of said capacitors; The differential outputs of the first and second differential amplifiers being electrically coupled in common; an output amplifier having an input electrically coupled to an output of the second chopper (chop2); the second-switch having a first second-switch electrically coupling the common outputs of the first and second differential amplifiers to the inputs of the second chopper, and a second second-switch state coupling the common outputs of the first and second differential amplifiers to the differential inputs of the second differential amplifier.