精密电流源是软件可编程

摘要：并联稳压器提供了一个跨越数字电位器，运算放大器和晶体管结合，形成了一个软件可编程，电压控制电流源恒定参考电压。

Maxim > Design support > App notes > Communications Circuits > APP 3464

Keywords: current source, software-programmable, voltage controlled, digital potentiometer

Mar 14, 2005
APPLICATION NOTE 3464
Precision Current Source is Software-Programmable
Abstract: A shunt regulator provides a constant reference voltage across a digital potentiometer that, in conjunction with an op amp
and transistor, forms a software-programmable, voltage-controlled current source.

With the addition of a few inexpensive miniature components, the hard-wired, voltage-controlled current source of yesterday
becomes a software-programmable voltage-controlled current source ( Figure 1).

A digi