How to Design a Low-Noise Dual Rail Voltage Supply

Industry Expert Consultant Mark Harris illustrates, from start to finish, how to design, build, and test a low-noise dual rail voltage supply that is perfect for high-performance op-amps. This is a great project for the beginning PCB designer, so be sure to grab a free trial of Altium Designer and follow along.
0:00 Intro
0:31 Voltage Regulator Overview
3:32 Adding a Blinking Low Battery LED
3:59 Board Layout and Routing
5:50 Hand-Assembly
7:09 Load Testing
9:07 Oscilloscope Testing
11:21 Outro
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[@napent]

It would be great to see the spectrum analyzer output of the signals

[@kfcmcdonalds]

Switchmode and Low Noise are kinda mutually exclusive. Ultra gets even harder. The simplest design with two +/- 9v batteries will be the quietest you can get, across the full noise bandwidth.

[@oliverer3]

Figured I'd watch this before I start laying this out and funnily enough I'd selected almost the exact same components. I'll take that to mean I must have been doing something right :D

[@GuambraMichelin]

Got a bit lost on the noise measurement, but other than that really nice design. I have seen a lot of this ground stitching but never knew why until now!

[@maks886]

That is a fantastic video, hats off!

[@AltiumAcademy]

Thank you so much 😀

[@fernandoi8958]

Your setup is amazing, would love to know more about which equipment you are using. What are you using to hold the boards in place by the way?

[@alperkaplan1839]

thanks great video.

[@AltiumAcademy]

You are welcome!

[@archsys5643]

very nice!!!

[@AltiumAcademy]

Thanks for the visit

[@BMM66666]

Why turns on the bandwidth limit on the oscilloscope?

[@Niels_Dn]

Why not use a switched mode regulator on the positive rail as well? By doing it with an LDO directly you’re dissipating over 300mW at full load there, which is a lot in a battery powered system.

[@marsrocket]

I didn’t understand why you put the 0 ohm resistor in the design. Are you running a simulation before building it?

[@drhubs7049]

You're a badass!

[@felipehmattos]

awesome video! thank you

[@AltiumAcademy]

Glad you liked it!

[@gpcm]

you only had 69 likes when i watched this video. I will come back later to give it a like because... you know

[@OriginalCircuit]

Nice!

[@tfinmoraes]

Hi Mark, great content! Amazing how one can get an off the charts low noise PS that "easily" these days! Quick question: at kzbin.info/www/bejne/rn3NeIdpgZdgr8U are you using an AZV321 op amp in open loop as a comparator? If yes, a possible suggestion is to use a proper comparator and avoid the unlikely but possible false triggering due to the op amp saturation. Since I don't have an altium licence, I couldn't check the schematics directly.

[@OriginalCircuit]

Yup, I'm using the opamp as a comparator to keep the BOM smaller, its very much a non-critical area of the circuit!

[@tristankordek]

👍

[@TheOleHermit]

Darn! Hoped this would solve my supply noise problem, but I need to go from a 5VDC USB supply to +/-9VDC rails for my op amps. 😢 Nevertheless, thanks for the tips that I was able to understand.

[@OriginalCircuit]

You should be able to implement an almost identical topology - just add a boost regulator and LC filter before the positive side linear regulator. So your 5V comes in, goes to two switching regulators - a +9.5v and -9.5V, which then both go to LC filters, and then feed a +9V and -9V linear regulator respectively.

[@TheOleHermit]

@@OriginalCircuit Thanks so much for that info. I'm currently using a IH0509S unregulated 5V to +/-9V DC-DC converter, w/10uF caps on the rails for smoothing on the prototype. Assumed that I needed to add +9V & -9V linear regulators, so I'll look for a single split one instead. Any suggestions for the LC filters? Full disclosure, I'm a real dip-shit regarding circuit design, but not too bad with a soldering iron. I really appreciate your help.🙏

[@krakamak]

Can someone tell me where can I find a similar silicon piece he used for the reflowing?

[@ShainAndrews]

No time stamp... no answer.

[@krakamak]

@@ShainAndrews 6.50

[@ShainAndrews]

@@krakamak You need to start using yer brain mate. He literally said what it was.

[@edgarwideman737]

@@ShainAndrews Sorry YOU need to start using your brain mate. @Nagy Bálint is asking (WHERE) to get the silicon mat. Not asking WHAT it is.

[@ShainAndrews]

@@edgarwideman737 Says the tard rocking emojis. Once a clown knows what something is... they damn well better be able to find where...