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Signal Chain Basics

Signal Chain Basics #93: How to Maximize Low-Side Sensing Performance

Signal Chain Basics
Krishnamoorthi
Krishnamoorthi
8/11/2016 6:07:20 AM
User Rank
Newbie
DA vs CSA
Hi Dan,

DA and CSA both seem to be virtually same. My question is "How CM input range is independant of supply voltage in CSA and not in DA"?. Can any one explain.

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Vishal Prajapati
Vishal Prajapati
9/15/2014 2:05:44 AM
User Rank
Master
Re: Low-side sensing
Yes, the shunt current sensing is the most basic technique. There is not much improvement in the shunt current sensing. There are inprovements like isolated sense signals using hall sensor in the IC. But shunt is still there. Like Allegro's ACS712, a Hall-Effect based current sense IC.

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fasmicro
fasmicro
9/13/2014 9:39:19 AM
User Rank
Master
Re: Low-side sensing
So, all in all it is the favourite among analog designers.

Absolutely, for many years I have been in this industry, I do not try to learn and try many things when it comes to current sensing. I know one  guy made lots of money when he invented APS camera by moving charges around. Largely, that has been in existence but he was able to get a patent. Current sensing is matured and options are limited besides the shunting technique.

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Vishal Prajapati
Vishal Prajapati
9/13/2014 8:33:27 AM
User Rank
Master
Re: Low-side sensing
I agree. The low side current sensing is the most used technique we could see in the actual application. It is easier to implement in the practical applictaion also. It is specially useful in high voltage application. There are lot of cheap low side sensing applications available in the market. The accuracy is also much better compared to contactless techniques of current sensing which has megnetic non linearity and saturation problem. So, all in all it is the favourite among analog designers.

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goafrit2
goafrit2
9/6/2014 4:11:47 PM
User Rank
Master
Low-side sensing
>> While there are many alternatives for low-side current measurements, current-shunt monitors offer significant accuracy advantages, lower power consumption, and smaller footprints

Current-shunt is largely the only technique for any serious designer in the industry. In this age of mobile and small footprint, it provides the least real estate on silicon. Had someone patented it as they did with APS camera by Eric Fossum that helps him get royalties in most digital camera designs, money would have been made

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