Noise Generator

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< Radio Frequency Electronic ~ Noise Generator

eric

Posted: Mon Aug 28, 2006 10:53 pm Post subject: Noise Generator

Site Admin Joined: 01 Jan 1970 Posts: 311

The noise generator proposed here operates according
to the digital principle, in contrast with the more
classical noise generator, which usually employs the
noise voltage of a base/emitter junction to generate
the signal. The big difference between the method
used here and the classical analogue design is that we
are not generating a real noise voltage but a collection
of discrete frequencies.
The clock generator built around IC1a
produces a signal of about 40 kHz.
This signal is used to clock shift registers
IC2 and IC3. The data at the input
of the double shift register is provided
by a network of XNOR gates. (IC4a
through c), the output of which
depends in turn on the state of the outputs
of the shift-register.
If the feedback network forms a
primitive polynomial (in this case
1+V2+V3+V5+V16), then

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