Title :
High precision bidirectional chopper instrumentation amplifier with negative and positive input common mode range
Author :
Stan, Matei Nicolae ; Creosteanu, Laurentiu ; Brezeanu, Gheorghe
Author_Institution :
Telecommun. & Inf. Technol., Univ. Politeh. of Bucharest, Bucharest, Romania
fDate :
June 30 2014-July 3 2014
Abstract :
A current feedback instrumentation amplifier (CFIA) with extended common mode input voltage range is presented. Referred to input offset of 70μV is obtained firstly by using chopping and gain enhancement techniques in order to increase the DC gain and secondly by adding an offset reduction loop (ORL). The proposed circuit is implemented in a high voltage 0.5μm SOI technology. A common mode rejection ratio (CMRR) of 260dB has been obtained by using single ended three stage architecture with a common mode input voltage from -18V to 80V. The stability of the CFIA is ensured for a close loop gain of 20V/V.
Keywords :
choppers (circuits); instrumentation amplifiers; silicon-on-insulator; CFIA; CMRR; DC gain; ORL; chopping techniques; common mode rejection ratio; current feedback instrumentation amplifier; extended common mode input voltage range; gain enhancement techniques; high precision bidirectional chopper instrumentation amplifier; high voltage SOI technology; negative input common mode range; offset reduction loop; positive input common mode range; single ended three stage architecture; size 0.5 mum; voltage -18 V to 80 V; voltage 70 muV; Choppers (circuits); Instruments; Noise; Resistors; Simulation; Transconductance; Transistors; chopping; high common mode input voltage; offset;
Conference_Titel :
Ph.D. Research in Microelectronics and Electronics (PRIME), 2014 10th Conference on
Conference_Location :
Grenoble
DOI :
10.1109/PRIME.2014.6872666
