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Design considerations for a transimpedance amplifier

Posted: 13 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:application note? transimpedance amplifier? photodiode?

It's challenging to design a good current-to-voltage (transimpedance) converter using a voltage-feedback amplifier (VFA). By definition, a photodiode produces either a current or voltage output from exposure to light. The transimpedance amplifier (TIA) is utilized to convert this low-level current to a usable voltage signal and the TIA often needs to be compensated for proper operation. This article explores a simple TIA design using a 345MHz rail-to-rail output VFA, such as National's LMH6611. The main goal of this article is to offer necessary information for TIA design, discuss TIA compensation and performance results and analyze the noise at the output of the TIA.

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