Conventional digital-to-analog conversion (DAC) is accomplished via a single processing path that must optimize broadband noise level against maximum output level, i.e., dynamic range. By splitting DAC processing into two or more discrete elements or “paths,” and passively recombining the analog resultants, order of magnitude improvement in dynamic range and linearity can be realized. Following a brief historical review, this paper will explore design details and experimental results on the author’s multi-path DAC prototypes, followed by experiments that assess multi-path design margins which exceed required psychoacoustic delivery parameters.
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