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It simply means that the DC component of diode output is proportional to the square

of the AC input voltage. So if you reduce RF input voltage by half, you'll get one quarter as much DC output.

Or if you apply ten times as much RF input, you get 100 times as much DC output as you did before. An

increase of 3dB results in twice as much output voltage.All diodes will follow

the square-law rule for small signals. We

should choose one that is fast, so 1N4000-

series power diodes are out. Any diode with a

lot of capacitance is out. Diodes with a sharp

I vs. V curve will give more output, so silicon

diodes are less desirable. Schottky diodes are

great, but they require DC biasing to get into

the really curved part of the I vs.V curve.

With zero bias, a germanium diode has very

decent qualities (apart from nasty

temperature effects). When Hewlett Packard

makes square-law diodes using exotic

semiconductors like gallium arsenide with

molecular-beam-epitaxy machines, the result

looks remarkably similar to a simple pointcontact

germanium diode like a 1N34A.

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Q: What is the square law detector?
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