Development of low noise, variable high gain amplifier for signal conditioning circuit

Abstract

This paper presents the design of low noise, variable high gain amplifier for signal conditioning circuit. A cascaded amplifier is used to improve the gain. A variable resistor is used to adjust the Common Mode Rejection Ratio (CMRR). The proposed amplifier is built on PCB board. Simulation and experimental results are discussed and compared. The new instrumentation amplifier has the features like gain up to 10000.0 gain, high linearity, and 106dB CMRR. It also has a low slew rate (0.07 V/ μs) and wide gain bandwidth product (0.324 X108Hz).