Digitally tuned digital radio frequency memory
First Claim
1. A digitally tuned digital radio frequency memory that captures a portion of a first radio frequency signal and retransmits the portion as a coherent radio frequency signal, the digitally tuned radio frequency memory comprising:
- a track and hold configured to track and hold the first radio frequency signal and to output a shaped signal;
a digitizer configured to convert the shaped signal to a digital word;
a memory configured to store the digital word; and
a direct digital frequency synthesizer configured to provide a sampling clock signal,wherein the sampling clock signal is provided to the track and hold.
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Accused Products
Abstract
A digitally tuned digital radio frequency memory that captures a portion of a first radio frequency signal and retransmits the portion as a coherent radio frequency signal. The digitally tuned radio frequency memory may include a track and hold configured to track and hold the first radio frequency signal and to output a shaped signal; a digitizer configured to convert the shaped signal to a digital word; a memory configured to store the digital word; and a direct digital frequency synthesizer configured to provide a sampling clock signal, wherein the sampling clock signal is provided to the track and hold.
17 Citations
32 Claims
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1. A digitally tuned digital radio frequency memory that captures a portion of a first radio frequency signal and retransmits the portion as a coherent radio frequency signal, the digitally tuned radio frequency memory comprising:
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a track and hold configured to track and hold the first radio frequency signal and to output a shaped signal; a digitizer configured to convert the shaped signal to a digital word; a memory configured to store the digital word; and a direct digital frequency synthesizer configured to provide a sampling clock signal, wherein the sampling clock signal is provided to the track and hold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for capturing a portion of a first radio frequency signal and retransmitting the portion as a coherent radio frequency signal using a digitally tuned digital radio frequency memory, the method comprising:
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tracking and holding the first radio frequency signal to output a shaped signal; converting the shaped signal to a digital word; storing the digital word in a memory; and providing a sampling clock signal from a direct digital frequency synthesizer, wherein the tracking and holding is based on the sampling clock signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A program for capturing a portion of a first radio frequency signal and retransmitting the portion as a coherent radio frequency signal using a digitally tuned digital radio frequency memory recorded on a computer readable medium, the medium comprising:
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a track and hold code section configured to track and hold the first radio frequency signal and to output a shaped signal; a digitizing code section configured to convert the shaped signal to a digital word; a storing code section configured to store the digital word in a memory; and a direct digital frequency synthesizer code section configured to provide a sampling clock signal, wherein the track and hold is based on the sampling clock signal. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification