Title :
A low-current logarithmic LED electrometer
Author :
Acharya, Y.B. ; Vyavahare, P.D.
Author_Institution :
Phys. Res. Lab., Ahmedabad, India
fDate :
2/1/2000 12:00:00 AM
Abstract :
A new circuit for measuring low dc currents using an LED-based logarithmic electrometer is presented. The electrometer is designed to measure currents from 1 pA to 0.1 mA. Temperature compensation is achieved using the ratio technique in the temperature range -20°C-70°C. Variations in the scale factor as a function of the input current and the device constant n as a function of temperature are also discussed
Keywords :
compensation; electric current measurement; electrometers; light emitting diodes; operational amplifiers; -20 to 70 C; 1 pA to 0.1 mA; I-V characteristics; logarithmic LED electrometer; logarithmic amplifier; low DC current measurement; nonlinear elements; ratio technique; scale factor variations; temperature compensation; Circuit testing; Current measurement; Light emitting diodes; P-n junctions; Photonic band gap; Semiconductor diodes; Semiconductor materials; Temperature distribution; Thermistors; Voltage;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
