Talk:Frequency multiplier

Early Frequency Multipliers

This article explains how modern frequency multipliers work, but what about pre-vacuum tube circuits? For example, the arc-converter transmitter article mentions frequency multipliers and links here.--208.42.18.222 01:39, 6 September 2006 (UTC)

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Multiplier vs synthesizer

A frequency synthesizer should not be characterized as a frequency multiplier. Classic multipliers run the input through a nonlinear circuit and harvest a harmonic. They don't have an independent oscillator. That a frequency synthesizer happens to generate only multiples of a reference frequency does not mean it is a frequency multiplier. Where is a WP:RS that says a PLL is a frequency multiplier? Glrx (talk) 02:09, 5 December 2010 (UTC)

• I agree. The PLL has its own article and does not belong here. This article should cover only non-linear harmonic generator for frequency multiplication.Trojancowboy (talk) 23:08, 30 January 2011 (UTC)

• • Perhaps a passing reference should say that PLL's have replaced many classic frequency multipliers and provide a link to their article.Trojancowboy (talk) 23:10, 30 January 2011 (UTC)

I agree with both the above. Only a short mention that PLLs are also used to multiply frequencies is necessary. BTW in the first sentence the term "harmonic" should be replaced by "multiple" to make the article more understandable to elementary readers. Chetvorno^TALK 23:36, 30 January 2011 (UTC)

What is a YIG multiplier?

Can someone explain that please? 169.233.193.96 (talk) 02:49, 17 May 2012 (UTC)

Good question, that should probably be included in the article. A YIG multiplier is a tunable microwave frequency multiplier using a YIG filter after the mixer. It is used in microwave integrated circuits. A YIG resonator, made with a yttrium iron garnet (YIG) crystal sphere, functions similarly to a quartz crystal except that it is usable at microwave frequencies, and its resonant frequency is electrically tunable over a wide range by varying the magnetic field on the crystal. In a YIG multiplier, an input frequency is applied to a step-recovery diode mixer, generating harmonics. The YIG filter allows one harmonic to pass to the output and filters out the rest. Which harmonic is output can be changed by tuning the YIG filter, so the circuit can function as a frequency multiplier where the multiplication factor, N, can be varied. --Chetvorno^TALK 09:39, 17 May 2012 (UTC)