说明：  在一些需要程控放大的场合, 如果使用一般的 放大器, 要改变放大倍数时, 则需采用切换外部电阻 的方式, 这种方式每一种增益都需要一套不同的电 阻, 因此只能有有限的几种增益, 电路结构和切换过 程都较复杂, 而且切换速度慢, 使用也不方便, 切换 不同的电阻还可能使放大器的输入阻抗发生变化, 从而影响精度1 现介绍一种高精度、 宽带、 可变增益 的放大器AD603, 在需要程控放大的场合, 它可大 显身手1
(Program-controlled amplification in a number of occasions the need, if you use ordinary amplifier, when to change the magnification, you need an external resistor with switching means, each gain in this way requires a different set of resistors, and can therefore only have a limited Several gain, the circuit structure and the switching process is more complicated and slow to switch to use is not easy to switch the resistance of different input impedance of the amplifier can also make a change, thus affecting the accuracy of a current paper introduces a high precision, broadband, Variable gain amplifier AD603, program-controlled amplification of the occasion required, it can show off their capabilities a)