micronetics, hudson, nh 03051 / tel: 603-883-2900 / fax: 603-882-8987 / noisesales@micronetics.com www.micr onetics.com CNS7109 c oaxial a mplified n oise s ource 5 mh zto 500 mh z d d escription escription the CNS7109 noise module is designed for a wide range of applications. it fea- tures 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. CNS7109 t ypical d ata s s pecifica pecifica tions tions ? frequency: 5 mhz to 500 mhz ? noise power spectral density (n o ): -103 dbm/hz (min) ? noise power (n): -16 dbm ? spectral flatness: 3 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 a a pplica pplica tions tions 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 demodulation. 1. barrage jamming: the noise source is fed into the tuning port of a vco via a bias tee and a posi- tive 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 den- sity function (pdf) for the desired jam- ming effect. 2. 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 num- ber 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 sampling or a sim- pler 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. available from stock
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