Title :
Bidirectional current conveyer with chopper stabilization and dynamic element matching
Author :
Jafari, Hamed Mazhab ; Genov, Roman
Author_Institution :
Department of Electrical and Computer Engineering, University of Toronto, Canada
Abstract :
A compact and accurate current conveyer for interfacing with a three-electrode electrochemical sensor is presented. It employs chopper stabilization to reduce transistor sizes for a given flicker noise. A current-copying circuit generates a mirror image of the sensor current for bidirectional conveying. It employs dynamic element matching to remove the mismatch in the current mirrors. The current conveyer prototyped in 0.13µm CMOS consumes 4µW from a 1.2V supply. It achieves an input-referred noise of 0.13pArms over a 1kHz bandwidth with a dynamic range of 8.6pA to 350nA. The prototype has been validated in DNA catalytic reporter detection.
Keywords :
CMOS integrated circuits; Choppers (circuits); Electrodes; Mirrors; Noise; Sensors; Transistors;
Conference_Titel :
Circuits and Systems (ISCAS), 2012 IEEE International Symposium on
Conference_Location :
Seoul, Korea (South)
Print_ISBN :
978-1-4673-0218-0
DOI :
10.1109/ISCAS.2012.6271416
