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1 International Journal of Microelectronics and Computer Science

1 2013

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Analysis and Design of a Chopped Current Mode Instrumentation Amplifier

Voulkidou A, Siskos S, Laopoulos T

International Journal of Microelectronics and Computer Science

2013

Vol. 4, nr 1

6--11

This paper presents the design of a chopper stabilized current mode instrumentation amplifier and analyzes the performance limitations imposed by chopping technique in detail. The amplifier targets to be the read out circuitry of a high precision temperature sensor. Since the required bandwidth in this kind of applications is very low, nested chopping technique is used to provide continuous offset reduction and eliminate 1/f noise. The amplifier is designed in 0.18 μm CMOS process. The resulting input referred noise is 20 nV/√ Hz, the offset is 582 nV and the CMRR exceeds 110 dB. The power consumption of the total design is 420 μW.