Semiconductor integrated circuit for communication, radio-communications apparatus, and transmission starting method
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United States of America Patent
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Jun 12, 2007
Grant Date -
Dec 4, 2003
app pub date -
Feb 26, 2003
filing date -
May 31, 2002
priority date (Note) -
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Abstract
In a polar loop based radio-communications apparatus having a phase control loop for controlling the phase of a carrier outputted from an oscillator for transmission, and an amplitude control loop for controlling the amplitude of a transmission output signal outputted from a power amplification circuit, the phase control loop is first started while maintaining the amplitude control loop in an off state at the outset of transmission, and the amplitude control loop is started after stabilizing the phase control loop.
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