I just ran across this thread. The manual for the GR 1382 noise genrator has a really good introduction into noise and its uses. https://www.ietlabs.com/pdf/Manuals/GR/1382 Noise Gen.pdf as well as the detailed schematic. They use a Zener for a noise source. However they grab a chunk of its RF spectrum and down convert to eliminate the 1/F problem. They also analyzed the probability density to confirm its randomness. It also has the circuitry for a pink noise filter.
I have need for a good reproducable noise source from 5 Hz to 150 KHz. Aside from the GR and the Quan-Tech I have found nothing. The pseudorandom + DAC is not flat to 100 KHz and I need that last HF piece. This circuit looks promissing. I'll build a variation and check it.
I have need for a good reproducable noise source from 5 Hz to 150 KHz. Aside from the GR and the Quan-Tech I have found nothing. The pseudorandom + DAC is not flat to 100 KHz and I need that last HF piece. This circuit looks promissing. I'll build a variation and check it.
Thanks, I downloaded that. Always interested. I had a circuit that frequency shifted, using some magical combo of analog multipliers. Was hoping to measure HF signals with a cheaper scope. Yeah, I need fingers like Alex Lifeson...
Analog Devices has a few generator examples using wideband SMD LNAs.
- https://electronics.stackexchange.com/questions/17174/why-use-lnas-in-a-noise-generator
- Pocket-Size White Noise Generator for Quickly Testing Circuit Signal Response | Analog Devices
- https://electricdruid.net/product-category/lfos-noise/
I have an Arduino LFSR program for any ESP8266. It disables the WiFI and interrupts for a loop time < 5 microseconds or 200khz.