In-circuit-measurement of parasitic elements in high gain high bandwidth low noise transimpedance amplifiers

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Cochems, P.; Kirk, A.T.; Zimmermann, S.: In-circuit-measurement of parasitic elements in high gain high bandwidth low noise transimpedance amplifiers. In: Review of Scientific Instruments 85 (2014), 124703. DOI:

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Parasitic elements play an important role in the development of every high performance circuit. In the case of high gain, high bandwidth transimpedance amplifiers, the most important parasitic elements are parasitic capacitances at the input and in the feedback path, which significantly influence the stability, the frequency response, and the noise of the amplifier. As these parasitic capacitances range from a few picofarads down to only a few femtofarads, it is nearly impossible to measure them accurately using traditional LCR meters. Unfortunately, they also cannot be easily determined from the transfer function of the transimpedance amplifier, as it contains several overlapping effects and its measurement is only possible when the circuit is already stable. Therefore, we developed an in-circuit measurement method utilizing minimal modifications to the input stage in order to measure its parasitic capacitances directly and with unconditional stability. Furthermore, using the data acquired with this measurement technique, we both proposed a model for the complicated frequency response of high value thick film resistors as they are used in high gain transimpedance amplifiers and optimized our transimpedance amplifier design.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:Fakultät für Elektrotechnik und Informatik

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1 image of flag of Germany Germany 7 43.75%
2 image of flag of China China 4 25.00%
3 image of flag of United States United States 2 12.50%
4 image of flag of Italy Italy 1 6.25%
5 image of flag of United Kingdom United Kingdom 1 6.25%
6 image of flag of Spain Spain 1 6.25%

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