brief introduction： A circuit in which the output signal frequency is an integer multiplier of the input signal frequency. If the input frequency is f1, the output frequency is f0=nf1, and the coefficient n is any positive integer, it is called the octave frequency. The frequency multiplier is widely used. For example, after the frequency multiplier is used in the transmitter, the main oscillator can oscillate at a lower frequency to improve the frequency stability. An FM device uses a multiplier to increase the fr

frequency doubler

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