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The first frequency doubler simulation was based on a
JFET that has a single source, namely Linear Systems.
I have nothing against Linear Systems but most people I know, would rather use common off the shelf, parts that are easy to obtain. This makes sense for future maintenence as well. Well, Dr. Bruce Griffiths was thinking along the same lines and, as usual, put together a very nice design using 2N3904 transistors. I think most of us have these parts in our spare parts box. The two transformers would be Mini Circuits parts with similar chracteristics. Here is the schematic and the analysis:
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And here are the THD results:
FOURIER COMPONENTS OF TRANSIENT RESPONSE V(VOUT) DC COMPONENT = 7.208965E-05 HARMONIC FREQUENCY FOURIER NORMALIZED PHASE NORMALIZED NO (HZ) COMPONENT COMPONENT (DEG) PHASE (DEG) 1 1.000E+07 2.679E+00 1.000E+00 -1.336E+02 0.000E+00 2 2.000E+07 8.894E-02 3.320E-02 -1.006E+01 2.571E+02 3 3.000E+07 2.975E-02 1.111E-02 -4.051E+01 3.603E+02 4 4.000E+07 8.089E-03 3.020E-03 1.593E+02 6.937E+02 5 5.000E+07 2.410E-03 8.998E-04 9.042E+01 7.584E+02 TOTAL HARMONIC DISTORTION = 3.515475E+00 PERCENT Not bad!
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And here are the appropriate waveforms:
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