Method and apparatus for artifact signal reduction in systems of mismatched interleaved digitizers
AssigneeLeCroy Corporation
InventorsJames Mueller, Peter J. Pupalaikis
Life of this patent
Estimating the term…
Abstract
An artifact signal correction system may include a mixing component to generate a waveform corresponding to an artifact such as an error tone, whereupon that waveform may be combined with the input waveform to substantially eliminate the artifact. In preferred embodiments, a method and apparatus for reducing spurious tones in systems of mismatched interleaved digitizers due to interleave error is provided. In various embodiments the method may include reversing the frequency content of an input signal, converting the reversed signal into interleave artifact content, delaying the input signal along a parallel path, and then subtracting the interleave content from the delayed input signal.
Claims19
An artifact signal correction method comprising the steps of:
- receiving an input signal;
- digitizing the input signal with a plurality of interleaved digitizers;
- reversing the frequency content of the digitized input signal to generate a reversed frequency waveform;
- deriving an artifact content from the reversed frequency waveform, said artifact content corresponding to at least one artifact generated in accordance with the digitizing of the input signal by the plurality of interleaved digitizers;
- delaying the input signal;
- and
- subtracting the artifact content from the delayed input signal to substantially reduce the at least one artifact.
An artifact signal correction method comprising the steps of:
- providing an input signal having at least one artifact;
- reversing the frequency content of the input signal to generate a reversed frequency waveform;
- deriving an artifact content from the reversed frequency waveform, said artifact content corresponding to the at least one artifact;
- delaying the input signal;
- and
- subtracting the artifact content from the delayed input signal to substantially reduce the at least one artifact,
- wherein reversing the frequency content of the input signal comprises flipping the input signal about a frequency at substantially one half an overall sample frequency.
A system for reducing interleave error, comprising:
- means for reversing the frequency content of an input signal;
- a converter for converting the reversed frequency content into interleave artifact content;
- a delay element for delaying the input signal;
- and
- a summing device for subtracting the interleave artifact from the delayed input signal, wherein the reversing means flips the frequency content of the input signal about a frequency at substantially one half an overall sample frequency.
A system for reducing interleave error, comprising:
- a receiver for receiving an input signal;
- a plurality of interleaved digitizers for digitizing the input signal;
- means for reversing the frequency content of the digitized input signal;
- a converter for converting the reversed frequency content into interleave artifact content, the artifact content corresponding at least one artifact generated in accordance with the digitizing of the input signal by the plurality of interleaved digitizers;
- a delay element for delaying the input signal;
- and
- a summing device for subtracting the interleave artifact from the delayed input signal.
Dependencies are inferred from the claim text.