LOCAL OSCILLATION SIGNAL LEVEL ADJUSTMENT CIRCUIT, LOCAL OSCILLATION SIGNAL LEVEL ADJUSTMENT METHOD, AND WIRELESS COMMUNICATION DEVICE
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United States of America Patent
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Issued Date -
Dec 1, 2016
app pub date -
May 17, 2016
filing date -
Jun 1, 2015
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Abstract
A local oscillation signal level adjustment circuit includes: a local oscillation circuit that outputs a local oscillation signal; a variable gain amplifier that amplifies the local oscillation signal level; a frequency conversion circuit that converts a radio signal into an analog baseband signal by using the local oscillation signal thus amplified; an A/D converter that converts the analog baseband signal into an output code of a digital baseband signal; and a control circuit that controls a gain of the variable gain amplifier on a basis of the output code of the digital baseband signal, wherein the control circuit increases the gain of the variable gain amplifier until the output code of the digital baseband signal becomes saturated.
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