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WEBENCH® Design Center

Transimpedance Amplifiers (TIA): Choosing the Best Amplifier for the job (Rev. A)

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This application note is intended as a guide for the designer looking to amplify the small signal from a photodiode or avalanche diode so that it would be large enough for further processing (e.g. data acquisition) or to trigger some other event in a system. The challenge in doing so, as always, is to not degrade the signal such that it becomes indistinguishable from random noise and to maintain enough signal bandwidth so that “information” is preserved. We will present some ideas on this and develop analysis and optimization techniques, as well as list the devices with the most desirable specifications for such applications.