Frequenzmultiplikation

Frequenzmultiplikation is a process in electronics and signal processing where the frequency of an input signal is increased to a multiple of its original frequency. This is achieved using nonlinear circuit elements or specialized multipliers. The output signal contains components at frequencies that are integer multiples of the input frequency, commonly referred to as the fundamental frequency. The most prominent component is at the desired harmonic frequency, but other harmonics may also be present.

Common methods for frequency multiplication include using diodes, transistors, or integrated circuits designed for this purpose. The nonlinearity of these devices is crucial, as it introduces harmonics into the output spectrum. If the input signal is a sine wave with frequency f, the output of a perfect frequency multiplier will contain components at frequencies nf, where n is the multiplication factor. In practice, unwanted harmonics and intermodulation products can also be generated.

Frequency multipliers find applications in various fields. They are essential in radio transmitters to generate carrier frequencies, in frequency synthesizers to create precise and stable frequencies, and in communication systems for upconversion. The choice of multiplier depends on the required multiplication factor, the desired output power, and the acceptable level of spurious signals. The efficiency of a frequency multiplier is a key performance parameter, as it indicates how much of the input power is converted to the desired output frequency.