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Design considerations for a transimpedance amplifier

Posted: 28 Feb 2008     Print Version  Bookmark and Share

Keywords:current-to-voltage  Transimpedance Amplifier  Voltage-Feedback Amplifier  rail-to-rail output 

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 utilised 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 345 MHz 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 analyse the noise at the output of the TIA.

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