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Variable gain amplifier with a gain exhibiting a linear in dB characteristic relative to a control voltage
Variable gain amplifier with a gain exhibiting a linear in dB characteristic relative to a control voltage
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机译:可变增益放大器,其增益相对于控制电压呈线性dB特性
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摘要
A variable gain amplifier is configured of an amplification circuit and a control circuit controlling a gain of the amplification circuit. The amplification circuit has first and second MOS transistors identical in characteristics and having respective sources connected to a first fixed potential. The amplification circuit has a differential gain proportional to a square root of a ratio between a current flowing through the first MOS transistor and a current flowing through the second MOS transistor. The control circuit applies a potential corresponding to a constant voltage plus a control voltage to a gate of the first MOS transistor and a potential corresponding to the constant voltage minus the control voltage to a gate of the second MOS transistor.
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