Title :
A Low-Power Wide Range Transimpedance Amplifier for Biochemical Sensing
Author_Institution :
Imperial Coll. London, London
Abstract :
This paper presents a novel low voltage and low power transimpedance amplifier for amperometric potentiostats. The power is optimized by having three different gain settings for different current ranges, which can be programmed with a biasing current. The voltage ranges have been optimized by using FGMOS transistors in a second voltage amplification stage that simultaneously allow for offset calibration as well as independent biasing of the gates. The circuit operates with input currents from 1 pA to 1 muA, with a maximum power supply voltage of 1.5 V and consumes 82.5 nW, 9.825 muW, 47.325 muW for currents varying from (1 pA, 0.25 nA), (0.25 nA, 62.5 nA) and (62.5 nA, 1 muA) respectively.
Keywords :
MOSFET; amperometric sensors; amplifiers; biosensors; chemical sensors; impedance convertors; FGMOS transistors; amperometric potentiostats; biochemical sensing; current 1 pA to 1 muA; independent gate biasing; low power transimpedance amplifier; low voltage transimpedance amplifier; offset calibration; power 47.325 muW; power 82.5 nW; power 9.825 muW; voltage 1.5 V; voltage amplification stage; Biosensors; Calibration; Chemical and biological sensors; Current measurement; Equivalent circuits; Low voltage; MOSFETs; Parasitic capacitance; Power supplies; Voltage measurement; Amplifiers, Electronic; Body Composition; Electric Impedance; Electrodes; Electronics, Medical; Equipment Design; Transducers;
Conference_Titel :
Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE
Conference_Location :
Lyon
Print_ISBN :
978-1-4244-0787-3
DOI :
10.1109/IEMBS.2007.4352879
