Invention Grant
- Patent Title: Digital radio frequency memory utilizing time interleaved analog to digital converters and time interleaved digital to analog converters
- Patent Title (中): 数字射频存储器利用时间交错模数转换器和时间交错数模转换器
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Application No.: US14189947Application Date: 2014-02-25
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Publication No.: US09071271B1Publication Date: 2015-06-30
- Inventor: Nathan E. Low , Shawn Walters
- Applicant: Lockheed Martin Corporation
- Applicant Address: US MD Bethesda
- Assignee: Lockheed Martin Corporation
- Current Assignee: Lockheed Martin Corporation
- Current Assignee Address: US MD Bethesda
- Agency: Howard IP Law Group, PC
- Main IPC: H03M1/66
- IPC: H03M1/66

Abstract:
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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