High-precision voltage controlled current source based on Wilson current mirrors

Via the combination of positive and negative Wilson current mirrors, read current flowing into power terminal of voltage follower composed of operational amplifier. Then high-precision voltage controlled current source can be obtained. This paper reflects the characteristic of current following caused by the combination of complementary Wilson current mirrors through simulation, with the experimental test circuit consists of a general Integrated operational amplifier and discrete BJT, aiming at the experimental results of the precision of voltage controlled current source and the characteristic of frequency response. Circuit bandwidth is much better than the unit gain bandwidth of operational amplifier, which shows the dominances of current-mode _circuit. When using CB process to implement monolithic integration, the circuit´s properties will be better.