In this work, a new architecture for the design of very compact instrumentation amplifiers is proposed. The amplifier has been specifically developed for use as a versatile block for sensor interfacing. The most innovative feature of the proposed cell is the wide input common mode range, which has a margin to both power rails as small as 200 mV. The circuit, which has been implemented with the 3.3 V CMOS devices of the UMC 0.18 μm process, operates with supply voltage in the 1.4â3.6 V range. An input offset voltage standard deviation of 8 μV has been obtained using chopper modulation combined with gain enhancement of the output current mirrors. The amplifier performances are estimated by means of accurate electrical simulations.
A compact low-offset instrumentation amplifier with wide input and output ranges
Piotto, Massimo;Del Cesta, Simone;Bruschi, Paolo
2018-01-01
Abstract
In this work, a new architecture for the design of very compact instrumentation amplifiers is proposed. The amplifier has been specifically developed for use as a versatile block for sensor interfacing. The most innovative feature of the proposed cell is the wide input common mode range, which has a margin to both power rails as small as 200 mV. The circuit, which has been implemented with the 3.3 V CMOS devices of the UMC 0.18 μm process, operates with supply voltage in the 1.4â3.6 V range. An input offset voltage standard deviation of 8 μV has been obtained using chopper modulation combined with gain enhancement of the output current mirrors. The amplifier performances are estimated by means of accurate electrical simulations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
