Methods and apparatus for detecting the envelope of RF power signals
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United States of America Patent
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Aug 14, 2007
Grant Date -
Jan 29, 2004
app pub date -
Apr 18, 2003
filing date -
Jun 3, 2002
priority date (Note) -
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Abstract
Apparatus for detecting the envelope of an RF signal that comprises an RF transistor operating essentially at a non-linear operating point at the RF frequency range; a DC power supply for feeding the RF transistor; a dummy load for terminating the output of the RF transistor; and at lease one impedance, through which the DC power supply feeds the RF transistor, for obtaining an indication signal developed across the impedance. The indication signal represents the envelope, from the fluctuating current drawn by the RF transistor from the DC power supply during the time period when the RF signal is applied to the feeding input.
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