CMOS instrumentation-amplifier based on ASKA cell

A modified Aska current-mode instrumentation amplifier (IA) is proposed in this paper. The main modification consists to add of a current negative impedance converter (INIC) in order to cancel the input current offset. The proposed configuration has been simulated using typical transistor parameters of the 0.35μm CMOS process from AMS. Under ±1.5V supply voltage, the circuit consumes 1.65mW. The IA exhibits a sensibility of 2, 3mV per Ω. In the same simulation condition, the sensibility deviation is lower than 0.0017% in the case of a resistive sensor having an impedance variation between 990Ω and 1010Ω.