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发明授权
CN109375699B 具有高线性度的电压电流转换电路 有权

具有高线性度的电压电流转换电路
摘要：
本发明公开了一种具有高线性度的电压电流转换电路，包括输入电阻、跨导放大器、第一及第二场效应管、放大器输出电平产生装置。输入电阻的一端与输入电压相连，另一端与跨导放大器的反相输入端及第一场效应管的漏极及栅极相连，跨导放大器的正向输入端接地，第一场效应管的栅极还直接与第二场效应管的栅极相连，第一场效应管的源极与跨导放大器的输出端相连，跨导放大器的输出端还直接与第二场效应管的源极相连，第二场效应管的源极还直接与放大器输出电平产生装置相连，第二场效应管的漏极用于输出电流。本发明采用负反馈电路和线性元件进行电压电流转换，消除场效应管转换的非线性影响，极大提高电压电流转换电路的线性度。
摘要（英）：

The invention discloses a voltage-current conversion circuit with high linearity, which comprises an input resistor, a trans-conductance amplifier, a first field effect tube, a second field effect tube and an amplifier output level generating device. One end of the input resistor is connected with the input voltage, the other end of the input resistor is connected with the inverting input end of the trans-conductance amplifier and the drain electrode and the grid electrode of the first field effect tube, the forward input end of the trans-conductance amplifier is grounded, the grid electrode of the first field effect tube is also directly connected with the grid electrode of the second field effect tube, the source electrode of the first field effect tube is connected with the output end of the trans-conductance amplifier, the output end of the trans-conductance amplifier is also directly connected with the source electrode of the second field effect tube, the source electrode of the second field effect tube is also directly connected with the amplifier output level generating device, and the drain electrode of the second field effect tube is used for outputting electric current. According to the voltage-current conversion circuit with high linearity, a negative feedback circuit and a linear element are adopted for voltage-current conversion, so that the nonlinear influence ofthe field effect tube conversion is eliminated, and the linearity of the voltage-current conversion circuit is greatly improved.

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