Double-Type Photocoupler Negative Feedback Circuit for Very Low Level DC Current Amplifier

Double-Type Photocoupler Negative Feedback Circuit for Very Low Level DC Current Amplifier

To obtain fast response in a very low level dc current amplifier, the amplifier using a single-type photocoupler negative feedback circuit has been developed; however, it has an offset drift problem because of the electrical property of the photocoupler. In this study, we proposed a very low level d...

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Veröffentlicht in:Japanese Journal of Applied Physics 2005-05, Vol.44 (5R), p.3287
Hauptverfasser: Higa, Hiroki, Higashionna, Takashi, Maehama, Takehiro, Nakamura, Ikuo
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container_issue 5R
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container_title Japanese Journal of Applied Physics
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creator Higa, Hiroki
Higashionna, Takashi
Maehama, Takehiro
Nakamura, Ikuo
description To obtain fast response in a very low level dc current amplifier, the amplifier using a single-type photocoupler negative feedback circuit has been developed; however, it has an offset drift problem because of the electrical property of the photocoupler. In this study, we proposed a very low level dc current amplifier using a double-type photocoupler negative feedback circuit that has two functional parts, that is, a negative feedback part and an offset controller. The experimental results show that the response speed of this amplifier is as high as that of the amplifier using the single-type circuit, and that the offset voltage drift of the amplifier using the double-type circuit is markedly improved.
doi_str_mv 10.1143/JJAP.44.3287
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title Double-Type Photocoupler Negative Feedback Circuit for Very Low Level DC Current Amplifier
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