| 摘要 |
A frequency double circuit includes an input terminal, a first voltage source, a multiplier, a second voltage source, and an output terminal. The input terminal receives an input signal and outputs to the first voltage source. The first voltage source filters out a direct current signal of the input signal. The multiplier includes two input ends receiving the input signal from the first voltage source for linear multiplication and gets a double frequency signal. The double frequency signal is output to the second voltage source for filtering out a direct current signal of the double frequency signal. The output terminal outputs the double frequency signal from the second voltage source.
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