INSTRUMENTATION AMPLIFIER FOR SENSOR FRONT END

The present invention provides a chopper stabilized instrumentation amplifier for sensor front end (300) for amplifying signals through parasitic capacitance cancellation and a method (1000) for amplifying signals by utilizing a chopper based instrumentation amplifier through parasitic capacitance cancellation for reduction of mismatch and chopping operation. In the present invention, input signal is first modulated to a higher chopping frequency as compared to received input signal to obtain a high common mode rejection (1002); capacitors are interchanged at each phase cycle operation of the instrumentation amplifier continuously until cancelation of mismatch is achieved (1004); amplified signal is transmitted through a buffer to drive loads of subsequent stages of a front end of an electronic circuity (1006); demodulating amplified signal to baseband signal (1008); and further transmitting demodulated signal through a low pass filter for removal of modulated noise and retaining original amplified signal obtained in step (1010). The most suitable drawing is Figure 3.