Post History
Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some speciall...
#3: Post edited
by
Nick Alexeev
·
2025-08-03T21:42:25Z (about 1 year ago)
[Short version. Planning to come back, expand this, add few references. ]- Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some specially designed LDOs can smooth out ripple from switch mode converters up to 2 MHz. But that's as high as LDOs go.
- Ferrite beads block high frequency noise better than LDOs. The ferrite bead along with the decoupling capacitors prevent the noise generated by the digital section of the A/D from leaking through the power supply rails to the analog section of the A/D.
- Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some specially designed LDOs can smooth out ripple from switch mode converters up to 2 MHz. But that's as high as LDOs go.
- Ferrite beads block high frequency noise better than LDOs. The ferrite bead along with the decoupling capacitors prevent the noise generated by the digital section of the A/D from leaking through the power supply rails to the analog section of the A/D.
#2: Post edited
by
Nick Alexeev
·
2025-07-16T15:13:45Z (about 1 year ago)
[Short version. Planning to come back and expand this, and add references. ]- Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some specially designed LDOs can smooth out ripple from switch mode converters up to 2 MHz. But that's as high as LDOs go.
- Ferrite beads block high frequency noise better than LDOs. The ferrite bead along with the decoupling capacitors prevent the noise generated by the digital section of the A/D from leaking through the power supply rails to the analog section of the A/D.
- [Short version. Planning to come back, expand this, add few references. ]
- Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some specially designed LDOs can smooth out ripple from switch mode converters up to 2 MHz. But that's as high as LDOs go.
- Ferrite beads block high frequency noise better than LDOs. The ferrite bead along with the decoupling capacitors prevent the noise generated by the digital section of the A/D from leaking through the power supply rails to the analog section of the A/D.
#1: Initial revision
by
Nick Alexeev
·
2025-07-16T15:12:55Z (about 1 year ago)
[Short version. Planning to come back and expand this, and add references. ] Digital side of the A/D converter injects noise into the digital supply rail. LDOs can regulate out low frequency oscillations. But LDOs don't block high frequency noise very well. Some specially designed LDOs can smooth out ripple from switch mode converters up to 2 MHz. But that's as high as LDOs go. Ferrite beads block high frequency noise better than LDOs. The ferrite bead along with the decoupling capacitors prevent the noise generated by the digital section of the A/D from leaking through the power supply rails to the analog section of the A/D.