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A fully-analog, on-chip, low input offset, low noise, variable gain instrumentation amplifier with a new scheme for nonlinear and dynamic temperature compensation of sensor sensitivity and offset, is designed in 0.18μm commercial CMOS process. The system has a scalable system bandwidth up to 5kHz, a dynamic range of 84dB, and a maximum gain of 104dB. All the sensor non idealities and CMOS process mismatch have been incorporated in simulation. Using this interfacing circuit, a smart MEMS piezoresistive accelerometer has been designed subsequently.
Date of Conference: 2-7 Jan. 2011