A method for fast start-up of crystal oscillator
A crystal oscillator and crystal technology, applied in the field of oscillator circuits, can solve the problems of accelerating start-up, increasing positive feedback gain, reducing the absolute value of negative resistance, etc., to shorten the start-up time, speed up the start-up speed, and reduce sleep. The effect of power consumption
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[0036] The invention provides a method for fast start-up of a crystal oscillator. The method adopts a circuit with an ordinary capacitor to simulate the negative capacitance effect, and adds it to the positive feedback loop of the crystal oscillator to reduce or offset the negative capacitance effect. The feedback of the equivalent capacitor connected in parallel at both ends of the crystal can change the change curve of the negative resistance when the positive feedback gain is increased, and can break through the maximum negative resistance limit that can be achieved by increasing the gain, so that the positive feedback gain can be increased to speed up the crystal. The oscillator starts to vibrate.
[0037] The present invention will be further described below in conjunction with accompanying drawing and embodiment, comprises the following steps:
[0038] 1. First construct a crystal oscillator as follows:
[0039] 1) The crystal is placed in a positive feedback circuit co...
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