Gain measurement circuit, gain measurement method, and communication apparatus
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United States of America Patent
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Sep 29, 2015
Grant Date -
May 2, 2013
app pub date -
Sep 11, 2012
filing date -
Oct 31, 2011
priority date (Note) -
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Abstract
A gain measurement circuit of a receiver includes a frequency mixer that receives a reception signal, mixes the reception signal with a local signal from an oscillator, and outputs an intermediate frequency signal; and a phase controller that extracts a part of the local signal, sets a different phase for the part, and outputs the part as the reception signal; wherein, for the different phase set by the phase controller, a direct-current voltage of the intermediate frequency signal output from the frequency mixer is detected, a conversion gain of the frequency mixer is obtained, and a gain of the receiver is calculated.
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