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Crystal oscillations, used to generate pulses, have their theoretical roots in "high-frequency electronic circuits". In "high frequency electronic circuits", it is the theory and circuit of high frequency oscillator, transmit, receive, modulation, demodulation and so on.

Advances in electronic technology have made it possible to replace the large scale plug-in crystal oscillator with a small, thin chip crystal oscillator. The previously known plug-in crystal oscillator is generally 2-pin, but the patch crystal oscillator is different.