Local oscillator
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United States of America Patent
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Aug 23, 2016
Grant Date -
Jul 14, 2016
app pub date -
Aug 24, 2015
filing date -
Jan 8, 2015
priority date (Note) -
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Abstract
According to an embodiment, a local oscillator includes a digitally-controlled oscillator, a frequency multiplier, a phase data generator, a subtracter, a moving average filter and a loop filter. The frequency multiplier is configured to multiply a frequency of a reference signal by N (where N is an integer of 2 or more) and generate a multiplication reference signal. The phase data generator is configured to output phase data of the oscillating signal in synchronization with the multiplication reference signal. The subtracter is configured to subtract the phase data from reference phase data and output the subtraction result as first phase error data. The moving average filter is configured to output, as second phase error data, a moving average of the consecutive N first phase error data in synchronization with the multiplication reference signal. The loop filter is configured to filter the second phase error data.
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