[AH] Red noize

[Martin Czech]

:::Idea : (may be stupid)
:::
:::Shift register noise has the advantage to be really white in the interesting
:::bandwidth, but it is not really random. How about using a junction avalanche
:::(that may not be white noise, depends on current, surface effects i.e. 
devices
:::etc.) to xor some of the shift registers inputs? I guess the shift register
:::will scramble (modulate) the avalanche pulses to something white,
:::but the sequence will be more random, there may be some correlation in it,
:::but it will never be the same, i.e. no cycles.
:::

Stupid addendum to first stupid idea:

We use phase modulation for the clocks of circuits, that would otherwise
generate too much clock noise.  I.e. we loose some clock frequency
margin to gain same damping of the clock partial and it's harmonics.

Shift register noise will suffer from clock feedthrough, too.  Perhaps one
could consider FREQUENCY modulating the clock, i.e. using a cheap 1MHz
VCO or so, this can be modulated in the first idea's junction noise,
a high pass filter will get us closer to real phase modulation


m.c.