Design of Chopper Stabilized Preamplifier for ECG monitoring System

This paper proposes a high gain Chopper stabilized preamplifier for the ECG monitoring system. In analog based ECG acquisition front end, a low noise amplifier is required to have a large dynamic range of 0.1 to 250Hz. A Chopper stabilized preamplifier is proposed which has high gain and removes the flicker noise. In chopper stabilized preamplifier, the input signal is modulated, amplified and in the back end it is demodulated to produce the noiseless signal. The performance of proposed preamplifier is compared with the conventional structure and it shows that the modified Preamplifier has high gain. The operating frequency of the preamplifier is 250H: The proposed preamplifier has better Total Harmonic Distortion than conventional structures. The simulations are done in the Cadence tool with 180nm technology in virtuoso platform.