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October 2007 [Devices & ICs] Digital VGAs Simplify And Shrink Wireless Transceivers Signal amplification is a key function in high-frequency radios. Many newer wireless-communications systems rely on maintaining stable amplitude within the radio's downconversion circuitry even when faced with a wide range of input signal levels. Because of this, the variable gain amplifier (VGA) has become an essential building block in many wireless radio transceivers. Traditional VGAs have varied the DC voltage to set the amplifier's gain, although additional circuitry and ... |
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