High-precision constant current source design

KerDim

High-precision constant current source design [Copy link]

 

Dear experts, have you ever designed a high-precision constant current and constant voltage source?

Voltage 0.1mV

Current 0.1mA

chunyang

Voltage range? Current range?

chunyang

The accuracy requirement is high, and in principle it should be built with a high-precision op amp, but the specific circuit structure must take all relevant parameters into consideration, and cannot simply look at the accuracy or step value.

maychang

【Voltage 0.1mV Current 0.1mA】

Is this the resolution? What is the required adjustable range of voltage and current?

lansebuluo

What are the specific functions and scope? Can you tell me in detail? There are many experts here.

lugl4313820

Buy a finished product from Taobao and copy it. Some may even have schematics, or look for open source projects.

qwqwqw2088

High enough precision

It may not be easy to make, and it is greatly affected by the environment and the temperature drift of the device.

呜呼哀哉

Either constant voltage or constant current, what is a constant voltage and constant current source, I can't figure it out

lansebuluo

A brief introduction to the design of constant current source circuit module - Power Technology - Electronic Engineering World - Forum (eeworld.com.cn)

There are many posts like this in the forum, you can take a look. . . . . . . . . . . . . . . .

lkh747566933

The power supply has always been used directly, and the power supply has never been designed.

Gen_X

If it is a constant current source, then the maximum output voltage is limited based on the cross current.

This is what we usually call: constant current and constant voltage.