[email protected] said: > The typical noise generator chips uses a PRNG based on DFFs and XOR > gate(s). A typical weakness is that the chain of DFFs is to short, causing > a relatively high rate of cycling, which hearable as a beating. However, for > some uses, that is OK.
The buzzword for the typical PRNG is LFSR - Linear Feedback Shift Register. Many years ago, Xilinx published a good app-note on this topic. There is also a section in Art of Electronics. With the right generating polynomial, you get a sequence of bits that doesn't repeat until 2^N-1 bits. The math geeks like to collect them. Each 1 bit in the polynomial turns into an XOR gate, so you will also find collections of polynomials with fewest bits. It's hard to imagine serious problems with too-short. Each FF doubles the no-repeat length. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
