Communication semiconductor integrated circuit, communication electronic component and wireless communication system
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United States of America Patent
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Jan 10, 2012
Grant Date -
Mar 12, 2009
app pub date -
Nov 3, 2008
filing date -
Mar 9, 2005
priority date (Note) -
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Abstract
A communication semiconductor integrated circuit includes a phase control loop and an amplitude control loop. A gain of a variable gain amplifier when it is detected from an output of the comparator that the amplitudes of the reference signal and the feedback signal are equal to each other while a predetermined DC voltage is applied to an amplifier which amplifies an output of a transmission oscillation circuit and is controlled by the amplitude control loop to vary the gain of the variable gain amplifier on a feedback path is held in a register. Thereafter, the DC voltage is changed to another value to detect the gain of the variable gain amplifier, so that the gain of a variable gain amplifier on the forward path is decided on the basis of the detected gain and the gain held in the register.
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