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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 ArticleRe: 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 ArticleRe: 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 ArticleRe: 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
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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...
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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...
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