The widest available operational amplifier, with the best voltage and current noise characteristics, is considered for transimpedance amplifier (TIA) applications where wide bandwidth is required to handle fast rising input signals (as for time-of-flight measurement cases). The added amplifier inside the TIA feedback loop can be configured to have slightly lower voltage gain than the bandwidth reduction factor (the ratio of the input capacitance plus the feedback capacitance to the feed capacitance). This innovation enables the optimization of design based on suitable space-approved operational amplifiers and provides better, stronger performance under radiation and wide temperature variations. In many cases, this approach can eliminate the need to qualify new amplifiers.

This work was done by Jacob Chapsky of Caltech for NASA’s Jet Propulsion Laboratory. For more information, contact This email address is being protected from spambots. You need JavaScript enabled to view it.. NPO-45798

NASA Tech Briefs Magazine

This article first appeared in the July, 2009 issue of NASA Tech Briefs Magazine.

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