METHOD AND APPARATUS TO IMPROVE THE LINEARITY OF THE TIME DOMAIN TRACE DERIVED FROM A SINGLE ENDED LINE TEST
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United States of America Patent
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Oct 1, 2015
app pub date -
Mar 27, 2015
filing date -
Mar 27, 2014
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The present invention is related to improvements to SELT testing, and more particularly to methods and apparatuses for reducing the effects of distortions of the reflected signal without sacrificing the integrity of the original signal. In embodiments, a method according to the invention consists of first modifying the transmit sequence to utilize and better “excite” the low frequency tones. In embodiments, the method includes compensating for transformer roll-off at low frequencies. In other embodiments, the method includes filling gaps in the received frequency domain S11 sequence with a predicted, or estimated, version of the S11 signal.
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