Novel Digital Voltage Ramp Generator for Use in Precision Current Sources in the Picoampere Range
- 27 January 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement
- Vol. 58 (4), 756-760
- https://doi.org/10.1109/tim.2008.2010675
Abstract
We report on the development of a novel highly linear voltage ramp generator to be used for the traceable calibration of picoamperemeters. The generator is based on two digital-to-analog converters, one of them being used to compensate for the differential nonlinearity of the other one. The generator is completely controllable by a computer, its voltage slope dV/dt is adjustable between 1 and 1000 mV/s. During a ramp running between -10 and +10 V, the slope shows a relative variation of only 1.3 middot10-5 (relative standard deviation). Due to a small output filter time constant of only 10 ms, we are, for the first time, able to conduct dynamic measurements of picoamperemeters with no sacrifice of linearity.Keywords
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