US Patent 7471147 Automatic gain controller
Patent 7471147 was granted and assigned to Samsung on December, 2008 by the United States Patent and Trademark Office.
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An automatic gain controller includes a variable gain amplifier for amplifying an input signal having a specified DC level on the basis of the DC level, and outputting a first differential signal having a specified gain α, a second differential signal having a 180° phase difference from the first differential signal, and an output signal obtained by subtracting the second differential signal from the first differential signal; a full-wave-rectifying unit for full-wave-rectifying the first differential signal and the second differential signal; a low-pass filter for extracting the DC component from the output signal of the full-wave-rectifying unit and outputting the extracted DC component; a reference voltage level adjustment unit for adjusting a DC level of a reference voltage; and a comparison unit for comparing the output signal of the low-pass filter with the output signal of the reference voltage level adjustment unit to adjust a gain of the variable gain amplifier.
US Patent 07471147 Automatic gain controller US Patent 7471147 Automatic gain controller
US Patent 07471147 Automatic gain controller
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