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Bill Cox
2014-09-29 12:13:24 -04:00
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There are currently 3 versions of Infinite Noise Multipliers documented here. The 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 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 which have rail-to-rail inputs and outputs. It runs at 4MHz, outputing 0.84 bits worth of
design that uses a few more resistors and an additional op-amp. This design is suitable entropy on each clock (loop gain = 1.8), for a total of 3.36Mbit of entropy produced per
for use with a wide range of op-amps. 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 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 components with low leakage, like the OPA4354 CMOS quad op-amp from TI. Op-amps with
running at lower frequencies with less power. 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 ![Schematic of small Infinite Noise Multiplier](infnoise_small/schematic.png?raw=true "Small
Infinite Noise Multiplier") Infinite Noise Multiplier")