A Precision Current Source Using $\Delta$– $\Sigma$ Modulation

Autor:	Tobias Bergsten, Gunnar Eklund, Valter Tarasso, Ove Gunnarsson, Karl-Erik Rydler
Rok vydání:	2011
Předmět:	Physics business.industry Electrical engineering Linearity Current source Delta-sigma modulation Capacitance Noise (electronics) law.invention Capacitor law Modulation Electronic engineering Electrical and Electronic Engineering business Instrumentation Voltage
Zdroj:	IEEE Transactions on Instrumentation and Measurement. 60:2341-2346
ISSN:	1557-9662 0018-9456
DOI:	10.1109/tim.2011.2117250
Popis:	We present a new source for currents in the picoampere range based on the charging of a capacitor at a constant rate. The voltage ramp is generated using Delta-Sigma modulation and low-pass filtering. This method ensures the linearity of the voltage ramp by calibrating a small number of voltage levels prior to generating the current. Our analysis shows that we can calibrate a picoampere meter with a standard uncertainty of less than 20 μA/A at 10 pA.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::454d8c808d040acf7a5b847686b9f6c7 https://doi.org/10.1109/tim.2011.2117250 Zobrazit plný text záznamu