Invention Grant
US09590648B2 Multi-path digital-to-analog converter 有权
多路数模转换器

Multi-path digital-to-analog converter
Abstract:
A digital-to-analog converter which improves dynamic range by apportioning a least significant bits portion of an incoming digital signal to a low-path circuit and a most significant bits portion of the incoming digital signal to a high-path circuit. The low-path circuit has a low-path digital-to-analog converter, which feeds a low-path resistive element, which feeds an output node. The high-path circuit has a high-path digital-to-analog converter, which feeds a high-path resistive element, which feeds an output node. The output node is a simple electrical connection of the outputs of the low-path and high-path resistive elements. The system can further improve dynamic range by providing a high-path amplifier with control element(s) which reduce or eliminate high-path noise from the output node. Further dynamic range improvement is realized when the high-path control system takes advantage of the effects of psychoacoustic masking. Performance linearity is improved by a feedback system which monitors the output signal.
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