Obtaining a Specific Harmonic of a Frequency

Hello,

Many times we want to obtain in our devices a specific harmonic of our input frequency and in order to do that we can build a frequency multiplier:

A frequency multiplier is an electronic circuit that generates an output signal and that output frequency is a harmonic (multiple) of its input frequency. Frequency multipliers consist of a nonlinear circuit that distorts the input signal and consequently generates harmonics of the input signal. A subsequent bandpass filter selects the desired harmonic frequency and removes the unwanted fundamental and other harmonics from the output.

Frequency multipliers are often used in frequency synthesizers and communications circuits. It can be more economical to develop a lower frequency signal with lower power and less expensive devices, and then use a frequency multiplier chain to generate an output frequency in the microwave or millimeter wave range.

And we can do that using specific diodes, for example below we have some frequency-doublers:

 And the diodes we can use in building them (including their specs):

I'm attaching the document with details.

Regards,

Fighter