High Gain Low Power Low Noise Trans-impedance Amplifier for Current Sensing Application

This paper work is about a transimpedance amplifier which have very high gain and sensitivity designed using cadence CMOS 0.18 mu m technology with supply voltage of 1.8V dissipates power 43 mu W suitable for current sensing signals from a sensor, molecular and nanodevice system. The integrator based circuit followed by an ADC. Because of the ability to handle large standing currents, the circuit is competent for use in the biological system where physical medium is also present. The transimpedance amplifier (TIA) designed has low noise high gain which make it suitable to interface with ADC. A capacitive feedback current amplifier drives current in to active load to obtain a 80 M-trans-impedance gain, 1.79 MHZ bandwidth phase response near 0.