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Bill Cox
2014-09-29 12:13:24 -04:00
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README.md
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@@ -79,13 +79,18 @@ an attacker.
There are currently 3 versions of Infinite Noise Multipliers documented here. The
infnoise_small directory describes a low part-count design that works well with op-amps
which have rail-to-rail inputs and outputs. The infnoise_fast directory contains a faster
design that uses a few more resistors and an additional op-amp. This design is suitable
for use with a wide range of op-amps.
which have rail-to-rail inputs and outputs. It runs at 4MHz, outputing 0.84 bits worth of
entropy on each clock (loop gain = 1.8), for a total of 3.36Mbit of entropy produced per
second. The infnoise_fast directory contains a 50% faster design that uses a few more
resistors and an additional op-amp. This design is suitable for use with a wide range of
op-amps. It runs at 6MHz, outputing 0.84 bits worth of entropy on each clock (loop gain =
1.8), for a total of 5.04Mbit of entropy per second.
Because Infinite Noise Mulitpliers are switched-capacitor circuits, it is important to use
components with low leakage. Op-amps with below 1nA of input bias current will enable
running at lower frequencies with less power.
components with low leakage, like the OPA4354 CMOS quad op-amp from TI. Op-amps with
below 1nA of input bias current will enable running at lower frequencies with less power.
To reproduce these simulations, download the TINA spice simulator from Ti.com.
![Schematic of small Infinite Noise Multiplier](infnoise_small/schematic.png?raw=true "Small
Infinite Noise Multiplier")