A low-power wide range transimpedance amplifier for biochemical sensing.
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 microA, with a maximum power supply voltage of 1.5 V and consumes 82.5 nW, 9.825 microW, 47.325 microW for currents varying from (1 pA, 0.25 nA), (0.25 nA, 62.5 nA) and (62.5 nA, 1 microA) respectively.
Rodriguez-Villegas
Esther
E
Department of Electrical and Electronic Engineering, Imperial College of London, England. esther@imperial.ac.uk
D000669:Amplifiers, Electronic; D001823:Body Composition / Q000502:physiology; D017097:Electric Impedance; D004566:Electrodes; D004582:Electronics, Medical; D004867:Equipment Design; D014159:Transducers