有源反馈放大器拓扑结构,如Ana- log Devices公司AD830和Lin- ear Technology公司LTC1193中的有源反馈放大器拓扑结构,可以用来产生精密电压—电流转换器.这又可能制作接地电容器积分器.本文描述的设计使用AD830(图1a),在高阻抗时提供双极输出电流.使用R=1kΩ时,标度仅仅是每伏输入1mA.最大电流因IC的输出电流能力而被限制为±30mA.输出电阻是由AD830的共模抑制性能确定的.60dB Active feedback amplifier topologies, such as the Active Feedback Amplifier topology in the AnaLog Devices ’AD830 and Lintel Technologies’ LTC1193, can be used to create a precision voltage-to-current converter, which in turn can make a grounded capacitor integrator. The design described in this article uses the AD830 (Figure 1a) to provide a bipolar output current at high impedance, with a scale of only 1mA per V for R = 1kΩ. The maximum current is limited to ± 30mA due to the IC’s output current capability The output resistance is determined by the common-mode rejection of the AD830