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The Electronics of Radio by David Rutledge

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14Noise and Intermodulation

Fundamentally, a receiver is limited in sensitivity by noise that competes with the signal we want. A receiver is also limited in handling strong signals by its nonlinearities, which produce intermodulation products that block reception. Noise is a random voltage or current that is present whether a signal is there or not. We distinguish noise from interference, which is an unwanted signal coupled into the circuit, and from fading, which is a variation in the signal level, caused by interference between radio waves arriving by different paths. There are many different sources of noise. Several forms are caused by bias currents. In diodes, the random arrival times of electrons cause shot noise. Another current noise ...

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