Current-Mode Matched Filter Architecture For Signal Acquisition
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United States of America Patent
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Issued Date -
Oct 6, 2016
app pub date -
Feb 9, 2015
filing date -
Feb 9, 2015
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Abstract
A matched filter is provided for signal processing applications such as GNSS and RADAR. The filter includes a plurality of correlator cells configured to receive a digital signal and are arranged so that values of the digital signal can be shifted amongst the plurality of correlator cells. Each correlator cell includes a correlator circuit, a data source and a current source. The correlator circuit is configured to receive a value from the digital signal and operates to correlate the value with a value of the known pattern stored in the data store. The current source is interfaced with the correlator circuit and selectively sources current based on the correlation operation performed by the correlator circuit; and an output circuit is coupled to each of the plurality of correlator cell and operates to generate an output which is correlated to current that is being source collectively by the current sources.
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