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Design for a Wideband, Differential Transimpedance DAC Output

Design for a Wideband, Differential Transimpedance DAC Output



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High-speed digital-to-analog converters (DACs) commonly offer a complementary current output signal. Most output interface implementations use either a resistive load and/or a transformer to convert this current source signal to a voltage. Where a DC-coupled interface is required, a carefully designed differential transimpedance stage can offer an attractive alternative. Design considerations and options will be shown using first wideband dual operational amplifiers (op amps), then using the newer fully differential amplifiers (FDA).

 




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