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TL084: 芯片输出反相,与datasheet上宣传的no phase reversal特性不符

Part Number: TL084

datasheet上明确说的,这个芯片是no phase reversal,如图所示

但是我实际测试出来的波形是这样的,

很明显,输入电压在低于芯片的动态输入范围时,输出没有按照想象的维持在饱和输出电压附近,而是发生了意想不到的相位翻转。

测试条件,电源±10V,输入正弦波Vpp为20V,频率10kHz,测试电路图如图所示

测试其中一个运放时,其他三个运放接成单位增益同相放大器,输入端接GND