Cartesian loop transmitter and method of adjusting an output level of such transmitter
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United States of America Patent
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Mar 4, 2008
Grant Date -
Jul 26, 2007
app pub date -
Apr 30, 2004
filing date -
Jun 17, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
In accordance with the present invention there is those provided a Cartesian loop transmitter having an isolator eliminator circuitry comprising a set of low pass and band pass filters for each of an I- and Q-channels, root mean square detectors and a divider connected to a comparator are received by a microprocessor which controls attenuation setting. There is also provided a method of adjusting an output level of such transmitter. Said method comprises the step of measuring an on-channel signal level and a noise level and then calculating a ratio of said noise to said on-channel signal. If the ratio exceeds a defined threshold an attenuation of the input attenuators is increased.
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