Title :
A novel precision dc current source in the pA range
Author :
Bergsten, Tobias ; Rydler, Karl-Erik ; Gunnarsson, Ove ; Eklund, Gunnar ; Tarasso, Valter
Author_Institution :
Dept. of Meas. Technol., SP Tech. Res. Inst. of Sweden, Borås, Sweden
Abstract :
We present a novel technique to generate an accurate dc current in the pA range. This source works by the charging of a capacitor using a voltage ramp with a precisely controlled slope. We generate this ramp with a precalculated Δ-Σ modulation sequence. The accuracy is limited by the voltage stability of the arbitrary wave generator used to generate the pattern.
Keywords :
capacitors; constant current sources; delta-sigma modulation; electric current measurement; function generators; ramp generators; Δ-Σ modulation; DC current source; arbitrary wave generator; capacitor; delta-sigma modulation; pA range; voltage ramp; voltage stability; Capacitors; DC generators; Stability; Voltage control;
Conference_Titel :
Precision Electromagnetic Measurements (CPEM), 2010 Conference on
Conference_Location :
Daejeon
Print_ISBN :
978-1-4244-6795-2
DOI :
10.1109/CPEM.2010.5544462
