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Passive Terminations for Current Output DACs


The correct implementation of the high-speed DAC output termination is critical to achieving the best possible performance. The typical application involves choosing the correct network to create the necessary dc bias levels and correct effective impedance load to keep the output voltage within the compliance levels. This ensures that the maximum output signal amplitude and optimum ac performance characteristics are achieved. The passive resistive termination to a modulator with equal and unequal bias levels are explored with various examples looking at the requirements for current source and current sink outputs.