A doubler is an electronic device that doubles the frequency of an input signal . Doublers are occasionally used in wireless communications to obtain transmission frequencies higher than those normally possible for a given circuit design.
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A doubler works by introducing nonlinearity into the input signal; that is, the waveform is deliberately distorted. This results in the generation of signals at harmonic frequencies, which are whole-number multiples of the input, or fundamental, frequency. In a doubler, a tuned circuit in the output is adjusted for resonance at the second harmonic of the input frequency (twice the fundamental).
The term doubler is occasionally confused with the term splitter . A splitter is a device that allows two signal lines to merge into one line, or one line to be split into two lines, while maintaining a proper impedance match for all the input and output lines.
The term doubler is sometimes used in place of the term line doubler , a device that allows TV signals to be displayed on a computer monitor.
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