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Digital radio frequency memory utilizing time interleaved analog to digital converters and time interleaved digital to analog converters
Digital radio frequency memory utilizing time interleaved analog to digital converters and time interleaved digital to analog converters
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机译:利用时间交错的模数转换器和时间交错的数模转换器的数字射频存储器
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摘要
A digital radio frequency memory (DRFM) comprises a plurality of time interleaved analog to digital converters (ADCs) in cooperation with a plurality of time interleaved digital to analog converters (DACs) to provide an effective sampling rate which may be greater than the clock rate of the system. A higher sampling rate at the ADC increases instantaneous bandwidth, while a higher sampling rate at the DAC improves spectral purity. The ADCs and DACs are time interleaved by supplying a clock signal to each ADC/DAC which is skewed with respect to the previous and subsequent skewed signal. In order to process the higher effective sampling rate, a pre-computation of DAC values for each high rate sample is performed by an SDAC algorithm that pipelines the calculations of the processed sample values provided to the DAC. A DAC bias correction is provided to adjust for drift in the DACs.
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