Ultrastable Low-Noise Current Amplifiers With Extended Range and Improved Accuracy
| Autor: | Dietmar Drung, Christian Krause |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Engineering
02 engineering and technology 01 natural sciences Noise (electronics) Temperature measurement law.invention 010309 optics law 0103 physical sciences Electronic engineering Calibration Range (statistics) 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Instrumentation Current range Physics Current-feedback operational amplifier business.industry Amplifier 020208 electrical & electronic engineering Direct current Electrical engineering Biasing Low noise Computational physics Measurement uncertainty Current (fluid) Resistor business |
| Zdroj: | IEEE Transactions on Instrumentation and Measurement. 66:1425-1432 |
| ISSN: | 1557-9662 0018-9456 |
| DOI: | 10.1109/tim.2016.2611298 |
| Popis: | The ultrastable low-noise current amplifier (ULCA) was developed as an advanced instrument for the improved measurement of currents generated by single-electron transport (SET) devices. It was optimized for direct currents in the picoampere range, and achieves an uncertainty of $ /A for a current of 100 pA typically generated by SET pumps. This paper summarizes our efforts in extending the ULCA’s current range and minimizing the measurement uncertainty over a wide range. Two ULCA variants with improved short-term uncertainty of about 0.02 $\mu \text{A}$ /A or improved noise level of 1.4 fA/ $\sqrt {\text {Hz}}$ are presented. Combining these devices allows the construction of a novel standard for direct currents below 50 $\mu \text{A}$ , which has superior performance to previous methods for small-current generation or measurement. ULCAs involving thick-film resistors achieve noise levels down to 0.43 fA/ $\sqrt {\text {Hz}}$ . A low-bias variant features an effective input bias current within ±100 aA and a temperature coefficient within ±10 aA/K, which enables uncertainties below 10 aA in direct current measurements without reversing or switching ON/OFF the signal current. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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