3 ms·
What I’m impressed by is getting noise of a consistent level out of a circuit. That’s a nice second layer of difficulty to the “make some noise” EE project.
by klodolph 1y ago
What I’m impressed by is getting noise of a consistent level out of a circuit. That’s a nice second layer of difficulty to the “make some noise” EE project.
- blobbers 1y agoI think the noise has to be random... so its inherently inconsistent ;) .. maybe?
- dragontamer 1y agoIts easy to think if you can see it in both frequency and time domains. So the fourier-transform of white noise is still.... white noise. Random is random as you say. But this has implications. That means the "wattage" of noise (ie: Voltage * Current == Watts aka its power) is a somewhat predictable value. If you have 0.5 Watts of noise, it will be 0.5 Watts of noise in the frequency-domain (after a fourier transform, across all frequencies). The hard part of amplification is keeping it consistent across all specifications. I assume the previous post was talking about keeping white noise (which is "flat" across all frequency domains), truly flat. IE: It means your OpAmps (or whatever other amplifer you use) CANNOT distort the value. Which is still student level (you cannot be a good EE / Analog engineer if you're carelessly introducing distortions). Any distortion of white-noise is easily seen because your noise profile weakens over frequency (or strengthens over frequency), rather than being consistent.
- DHRicoF 1y agoBut most common noises are not white. you had to decolor it before.
- dragontamer 1y agoAlternatively, you can choose a proven source of white noise. Such as the reverse-bias shot and/or avalanche noise at the pn junction of a reverse bias'ed Zener Diode. Which is white-noise into the hundreds-of-MHz. Maybe not good enough for RDSEED, but certainly good enough and fast-enough for most hobbyist projects who are experimenting with this for the first time.