Transmitter
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United States of America Patent
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Apr 5, 2016
Grant Date -
Dec 26, 2013
app pub date -
Jun 11, 2013
filing date -
Jun 11, 2012
priority date (Note) -
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Abstract
The invention provides a transmitter comprising two (or more) phase locked loops controlling respective oscillators, and implementing different phase modulation. Multiple phases are derived from the respective oscillators, and an edge rotator forms an output signal from a combination of the phases. The oscillators can operate at different frequencies, neither of which is an integer multiple of the other, whereas the output signals of the multiplexers of the first and second phase locked loops are closer in frequency and can be the same. This reduces the problem of pulling, with a circuit that can be implemented with low power and area and with the versatility of being digitally intensive.
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