Apparatus for radio telecommunication system and method of building up output power
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United States of America Patent
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Apr 29, 2008
Grant Date -
Oct 11, 2007
app pub date -
Apr 3, 2007
filing date -
May 31, 2002
priority date (Note) -
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Abstract
A polar loop based radio telecommunication apparatus which has a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmitter, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplifier circuit, wherein precharge means is provided on a forward path from a current source, through the power amplifier circuit, to a detection circuit, forming the amplitude control loop, for rapidly increasing a control voltage for the power amplifier circuit to a power threshold upon starting transmission.
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