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Variable gain amplifier having linear-in-dB gain characteristic
Variable gain amplifier having linear-in-dB gain characteristic
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机译:具有dB线性增益特性的可变增益放大器
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摘要
A variable gain amplifier (VGA) with a linear-in-dB gain characteristic is provided. The VGA includes: a control signal converter which converts an input gain control signal VC, which is input so that the VGA obtains a linear-in-dB gain characteristic to the maximum gain, into an output gain control signal Vx=VTln((1/m)exp(−VC/VT)−1) (m is a constant, VT=kT/q); and a variable gain amplifier which receives and converts the output gain control signal VX output from the control signal converter so that the gain has a linear-in-dB characteristic. A shape of a gain curve is externally controlled.
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机译:提供具有线性dB增益特性的可变增益放大器(VGA)。 VGA包括:控制信号转换器,其将输入的输入增益控制信号V C Sub>转换为使得VGA获得最大增益的dB线性增益特性,作为输出增益。控制信号V x Sub> = V T Sub> ln((1 / m)exp(-V C Sub> / V T Sub> )-1)(m为常数,V T Sub> = kT / q);可变增益放大器接收并转换从控制信号转换器输出的输出增益控制信号V X Sub>,从而使增益具有dB线性特性。增益曲线的形状由外部控制。
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