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高输入阻抗运算放大器是运算放大器系列的一个重要分支,它的应用范围很广。最主要的应用领域是要求低输入偏置电流和低输入失调电压的高信号源阻抗直流放大器、高精度和低电流的电流电压转换电路、高输入阻抗的测量放大器和低偏差的取样保持电路以及要求高速宽频带的快速D/A转换器、宽带低噪声放大器、高速对数放大器、有源滤波器和高速取样保持电路。电路分析可以证明,运算放大器的输入阻抗与它的输入偏置电流成反比。在集成运算放大器的发展中,提高运算放大器的输入
The high input impedance op amp is an important branch of the op amp family and has a wide range of applications. The main areas of application are high source impedance DC amplifiers that require low input bias current and low input offset voltage, high accuracy and low current current-voltage conversion circuits, high input impedance measurement amplifiers, and low-skew sample-and-hold circuits and Fast D / A converters that require high speed broadband, wideband low noise amplifiers, high speed logarithmic amplifiers, active filters, and high speed sample-and-hold circuits. Circuit analysis proves that the op amp’s input impedance is inversely proportional to its input bias current. In the development of integrated operational amplifier, improve the input of the operational amplifier