MICRONETICS, HUDSON, NH 03051 / TEL: 603-883-2900 / FAX: 603-882-8987 / NOISESALES@MICRONETICS.COM

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SMN7108

D

ESCRIPTION

The SMN7108 noise module is designed

for a wide range of applications.

It features high noise output amplitude

for uses ranging from encryption to jam-

ming. All biasing and amplification circuit-

ry is built-in making it easy to design into

your system. It features a built-in voltage

regulator for highly stable output even if

your DC supply lines are not.

S

FOR

H

IGH

V

OLUME

P

RODUCTS

The SMN7108 noise sources being sur-

face mount, having a small footprint and

available on tape and reel, make them

ideal for production manufacturing.

Traditionally packaged noise sources

have been large and costly rendering

them less suitable for all but the more

expensive, exotic systems. Noise can

now be thought of as lower cost, more

reliable, smaller and an easier to imple-

ment alternative to costly microprocessor

based solutions such as PN generators,

arbitrary waveform generators and DSP

processors.

S

TIONS

• Frequency:

50 kHz to 100 MHz

• Noise Power Spectral Density (No):

-87 dBm/Hz (min)

• Noise Power (N): -7 dBm

• Spectral Flatness: 2 dB (total window)

• Bias:

12 Vdc

Internally Regulated

• Current Draw:

50 mA Max

• Peak Factor:

5:1

• Operating Temp: -55 to +85 C

• Storage Temp:

-55 to 125 C

Common Noise Applications

1. Built-in IF Testing: Highly stable flat over frequency noise sources serve to provide

built-in test for an IF subsystem. By injecting a stable signal reference through the IF

chain, one can calibrate the gain/loss and frequency response. In addition, the noise

source can be used to set up Eb/No for built-in stimulated BER testing of digital demod-

ulation.

2. Barrage Jamming: The noise source is fed into the tuning port of a VCO via a bias

tee and a positive DC voltage. The random nature of noise makes the output of the

VCO to hop around in a given frequency band randomly making an ideal jamming sig-

nal. Further circuitry can be used between the noise source and tuning port to shape

the noise probability density function (PDF) for the desired jamming effect.

3. Random Number Generation for Encryption: Noise sources being truly random (not

pseudorandom) give the ultimate in secure communication because of their ability to

generate a truly random number pattern. This can be used to seed an encryption key

for authentication. The noise signal can be fed directly into an A/D converter for sam-

pling or a simpler techniques might use a comparator. Further shaping of the noise is

often employed whether either analog if in front of the A/D converter or afterwards using

DSP.