Noun
English Wikipedia has an article on:frequency multiplierWikipedia
frequency multiplier (plural frequency multipliers)
an electronic circuit that produces an output frequency that is an integral multiple of an input frequency
For example, if the phase locked loop were to implement a frequency multiplier, the oscillator signal could be divided in frequency before it is compared to the reference signal. Source: Internet
This element can be other elements such as a frequency multiplier, or a mixer. Source: Internet