Amplitude modulation controller for polar transmitter
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United States of America Patent
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Jun 4, 2013
Grant Date -
Nov 25, 2010
app pub date -
May 21, 2010
filing date -
Nov 23, 2007
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Abstract
Apparatus for generating a modulation signal for use in modulating the power supply of a power amplifier uses coarse and fine control for controlling the amplitude of the modulation signal, and thereby controlling the output power of the power amplifier. The modulation signal may be generated in the digital domain and converted to the analog domain by a digital-to-analog converter, with the digital-to-analog converter providing the fine control and a variable gain amplifier providing the coarse control of the analog signal.
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