Current-Mode Rail-to Rail Instrumentation Amplifier for General Purpose Instrumentation Applications

Year 2016, , 363 - 367, 01.12.2016

Uğur Çini

https://doi.org/10.18100/ijamec.280497

Abstract

 Instrumentation amplifiers are used extensively in
bio-potential reading, industrial sensor applications, Wheatstone bridge
amplifiers etc. In this work, a high input common-mode range instrumentation
amplifier is presented. The amplifier is composed of two second generation
current conveyors (CCII+) with common-mode input range close to supply swings
and a differential difference current conveyor (DDCC) at the second stage with
high voltage swing at the output. Also an optional DC servo loop is employed as
a feedback to second stage for the removal of any possible DC offset voltage at
the output which can be used for AC coupled applications. The simple design
strategy with high input common-mode range and nearly rail-to-rail output stage
together with increased bandwidth advantage of current-mode approach makes the
proposed implementation desirable for many of the general purpose
instrumentation applications. The design is made using 0.35μm AMS technology
with 3V supply voltage. The operation is verified by HSPICE simulations.

Keywords

Current-mode circuits, biomedical instrumentation, current-conveyors, current-mode instrumentation amplifier (CMIA)

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