Quantcast
Channel: EngineerZone: Message List - ADM660 input switching noise
Browsing latest articles
Browse All 12 View Live

Image may be NSFW.
Clik here to view.

ADM660 input switching noise

Hello, I'm trying to power an AD8052 opamp with a +/- 5V power supply. The positive +5V supply for the op amp is generated by an LM317 voltage regulator (the input is a 9V battery). While, the negative...

View Article


Re: ADM660 input switching noise

Whilst my area is really inductor based power supplies, I thought you may be interested in the article here: http://www.tnt-audio.com/clinica/regulators2_impedance1_e.html  This looks at the impedance...

View Article


Re: ADM660 input switching noise

Hi Alex, This is a common question that I think we can help you with.  Consider the two phases of the inverting charge pump operation:Phase 1:  C1 (the flying cap, which is C38 on your schematic) is...

View Article

Re: ADM660 input switching noise

I would also add that the 10uF Jon is recommending should be placed right next to pin 8 and oin 5 of the ADM660. C35 is probably too far away from the ADM660 to really keep the source impedance low. LucaV

View Article

Image may be NSFW.
Clik here to view.

Re: ADM660 input switching noise

Hello, Thank you all for your help. I've tried some of your suggestions and here are my results: 1. What seems to have the greatest influence is the LM317's output bypass capacitors. First I changed...

View Article


Image may be NSFW.
Clik here to view.

Re: ADM660 input switching noise

Hi Alex,Looks like you've made a lot of progress so far.  Here's a couple of comments in response to your results and questions:1.  Ceramic caps:  I'm surprised that ceramic capacitors don't help your...

View Article
Browsing latest articles
Browse All 12 View Live