System and method of digital-to-analog signal conversion

摘要

A system for reconstructing broadband analog signals from digital information includes a digital processing unit for decomposing a digital input signal into a plurality of multirate, digital input signal sub-components with optimized quantization levels, and a digital-to-analog converter (DAC) bank for converting the plurality of digital input signal sub-components into a corresponding set of analog signal sub-components, which are then combined and time-aligned. The digital processing unit preferably includes a multirate filterbank for separating the digital input signal through discrete wavelet decomposition, such through Haar wavelet decomposition. The DAC bank includes an array of digital-to-analog converters (DACs) with sample rates that vary by a constant factor. By combining the broadband capabilities of one or more relatively fast DACs with the accuracy associated with one or more relatively slow DACs, the digital-to-analog conversion system is able to achieve high bandwidth capabilities at an acceptable level of dynamic range.

主权项

1. A system for converting a digital input signal into a corresponding analog output signal, the system comprising:
(a) a digital processing unit for decomposing the digital input signal into a plurality of digital input signal sub-components; and (b) a multirate digital-to-analog converter (DAC) bank, the DAC bank comprising an array of digital-to-analog converters (DACs) with varying sample rates for converting the plurality of digital input signal sub-components into a corresponding set of analog signal sub-components, the DAC bank combining together the set of analog signal sub-components to yield the analog output signal.