Transimpedance instrumentation amplifier based on current inversion

Herve Barthelemy (1) , R. Vauche (1) , V. Gies (1) , Jean Gaubert (1) , Sylvain Bourdel (2)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 IMEP-LAHC - Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation

this paper presents a novel instrumentation amplifier operating a differential current measurement from a resistive bridge. The proposed transimpedance instrumentation amplifier is constructed with two voltage opamps. One opamp is used to realize the current inversion and the second as a single input transimpedance amplifier. The resistive bridge is biased by a DC current and that it differs from the traditional voltage Wheatstone bridge. Simulation results by PSpice from a full custom 0.35m CMOS opamp (BSIM transistor models) and the commercially LT1097 from linear technology (macro-model) show well performances of the proposed topology and confirm the validity of the circuit. Under ±2V opamps supply voltages, the CMOS full custom configuration consume 273W per MHz and provides a linear sensitivity of 5mV/

Domaines: Micro et nanotechnologies/Microélectronique

Herve Barthelemy, R. Vauche, V. Gies, Jean Gaubert, Sylvain Bourdel. Transimpedance instrumentation amplifier based on current inversion. 2017 15th IEEE International New Circuits and Systems Conference (NEWCAS), Jun 2017, Strasbourg, France. ⟨10.1109/NEWCAS.2017.8010126⟩. ⟨hal-01704374⟩