Activity for Andy aka
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| Edit | Post #295381 |
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| Edit | Post #295934 |
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| Edit | Post #295934 |
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| Edit | Post #295934 |
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| Edit | Post #295934 | Initial revision | — | 5 months ago |
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MFB band-pass filter transfer function derivation The band-pass MFB filter is easier to analyze compared to the low-pass (for example) filter. If you are only interested in the result skip to the end. The MFB band-pass filter: - Imagealttext The first thing to do is convert impedances and the op-amp to functional blocks using circuit theor... (more) |
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| Edit | Post #295759 |
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| Edit | Post #295759 |
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| Edit | Post #295759 | Initial revision | — | 6 months ago |
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A: Need Clarification on Op‑Amp Selection and Direct ADC Input Drive Requirements Your opening words appear to be at odds with your schematic but, assuming the schematic is correct I'm thinking why bother with an op-amp at all. According to sources on-line the input capacitance of the ADC is about 10 pF so, if that was directly fed from C44 in a slightly different arrangement ... (more) |
— | 6 months ago |
| Comment | Post #295563 |
I got suspended from the other place. Regarding what you are asking in comments, read my final paragraph. I don't know what you mean by "threat". I can only give generalizations about parasitic inductance because your images are not clear as to where the "inductor" is and, I don't watch videos an... (more) |
— | 7 months ago |
| Edit | Post #295563 |
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| Edit | Post #295563 |
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| Edit | Post #295563 | Initial revision | — | 7 months ago |
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A: Laying out Switching Loops on PCB for Minimum Loop Area and Parasitic Inductance > Planar Loop has the minimum depth ( a few µm) and therefore would produce the highest parasitic inductance. Vertical Loop 1 is on a 2-layer PCB and its depth is the height of the PCB ( a few mm), therefore, its parasitic inductance would be much lesser than the planar's. Vertical Loop 2 is o... (more) |
— | 7 months ago |
| Edit | Post #295519 |
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| Edit | Post #295519 |
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| Edit | Post #295519 |
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| Edit | Post #295519 |
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| Edit | Post #295519 | Initial revision | — | 7 months ago |
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A: Integrator saturating > Why is my integrator saturating even though the input frequency is extremely low (8.33 mHz) The lower the frequency, the greater the chance that an integrator's output will saturate and, this might be what you are referring to. But also, your input (the triangle wave) is wholly above the ... (more) |
— | 7 months ago |
| Edit | Post #295494 |
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| Edit | Post #295494 |
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| Edit | Post #295494 |
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| Edit | Post #295494 |
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| Edit | Post #295494 |
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| Edit | Post #295494 | Initial revision | — | 7 months ago |
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A: There are RCD units for DC exist. How do they sense the small DC current difference? > There are GFCI (RCD) units for DC. How do they sense the small DC current difference? and > But a transformer is an AC thing. What’s done for DC? The "board level module" you link requires a power supply (if you read the details) hence, it's not like a simple passive CT that is onl... (more) |
— | 7 months ago |
| Edit | Post #295476 |
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| Edit | Post #295476 |
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| Edit | Post #295476 |
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| Edit | Post #295476 |
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| Comment | Post #295381 |
Afternoon Tony. I see you're back active in the "other place". I (as bloody usual) am on another suspension but will be back soon lol. (more) |
— | 7 months ago |
| Edit | Post #295476 |
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| Edit | Post #295476 |
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| Edit | Post #295476 | Initial revision | — | 7 months ago |
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A: Cutoff frequency of lowpass filter for AVcc > Is this a good value? A 10 kΩ resistor in series with AVCC won't cut the mustard at all. AVCC does draw current (PLL and ADC for example) and, this can be several mA so, an inductor is needed (along with capacitor C2 in your diagram). Typically something like 10 μH appears to be reco... (more) |
— | 7 months ago |
| Edit | Post #295381 |
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— | 8 months ago |
| Edit | Post #295381 | Initial revision | — | 8 months ago |
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MFB low-pass filter transfer function derivation The low-pass MFB filter can be a little tricky to analyse so, if you are only interested in the result skip to the end. The MFB low-pass filter: - Imagealttext The first thing to do is convert impedances to functional blocks using circuit theorems: - Imagealttext The stages above shou... (more) |
— | 8 months ago |
| Comment | Post #294791 |
But, AVDD in the first part of what you say exactly matches AVDD in your 2nd sentence so, either you are repeating yourself illogically or you meant something else other than AVDD in the 2nd part. Ditto DVDD. (more) |
— | 11 months ago |
| Comment | Post #294791 |
You say you have "two regulators for powering the AVDD and DVDD of the ADC" then you say straight afterwards "Same regulator is used for powering the AVDD and DVDD" <-- are you intentionally repeating yourself for some reason? (more) |
— | 11 months ago |
| Edit | Post #294707 | Initial revision | — | 11 months ago |
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A: Electrolytic capacitors: capacitors vs. batteries > It looks to me like electrolytic capacitors are somewhat in the middle of these, some designed to follow the capacitor equation as close as possible, others focused more on energy storage. Not as far as I am aware. Even Ultracaps tend to fairly rigorously follow the capacitor equation. So... (more) |
— | 11 months ago |
| Edit | Post #294572 |
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| Edit | Post #294558 |
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| Edit | Post #294572 |
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| Edit | Post #294572 |
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| Edit | Post #294572 |
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