Semiconductor device including a decimation filter that performs predetermined filtering
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United States of America Patent
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Sep 1, 2015
Grant Date -
Mar 14, 2013
app pub date -
Jul 17, 2012
filing date -
Sep 8, 2011
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Abstract
To variably change the filter characteristic of a decimation filter in accordance with a sampling rate. A decimation filter 13 in a semiconductor device 1 sequentially inputs a signal sampled at a predetermined sampling rate fos, and calculates, for each input signal that is input within a predetermined period (a period for M+2N), a filter coefficient Cj for performing predetermined filtering processing in response to a trigger signal TR continuously applied, and furthermore sequentially multiplies the input signal by the calculated filter coefficient, accumulates a multiplication value within the predetermined period, and sequentially outputs the result. The predetermined period is made variable in accordance with a time interval at which the trigger signal is applied.
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