Quartz crystal oscillator circuit

Abstract

The invention discloses a quartz crystal oscillator circuit, and relates to the technical field of integrated circuit design. The quartz crystal oscillator circuit includes a power supply, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a crystal oscillation circuit and an output circuit. An automatic amplitude control circuit and a biasing circuit are integrated in one circuit through the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the first resistor, the second resistor, the third resistor, the fourth resistor, the first capacitor, the second capacitor, the third capacitor and the fourth capacitor. When the oscillation frequency of the crystal oscillator is adjusted, the current of the biasing circuit can also be adjusted, and the current of the biasing circuit is prevented from being always maintained at a constant value, so that the power consumption of the quartz crystal oscillator circuit is remarkably reduced, and the ultra-low power consumption is realized.

Description

technical field [0001] The invention relates to the technical field of integrated circuit design, in particular to a quartz crystal oscillator circuit. Background technique [0002] At present, the quartz crystal oscillator circuit on the market controls the oscillation amplitude of the oscillator to maintain the target amplitude through an additional conventional automatic amplitude control circuit. The conventional automatic amplitude control circuit realizes the adjustment of the oscillation by adjusting the current of the crystal oscillator circuit in the quartz crystal oscillator circuit. The oscillation amplitude of the oscillator, the conventional automatic amplitude control circuit can control the oscillation amplitude of the crystal oscillator (the oscillation amplitude of the oscillator) to the target amplitude (the target amplitude is determined by the width-to-length ratio of the MOS tube of the bias circuit in the quartz crystal oscillator circuit) , so as to en...

AI Technical Summary

Problems solved by technology

[0003] In summary, there is circuit redundancy in the quartz crystal oscillator circuit on the market, and the conventional automatic amplitude control circuit in the quartz crystal oscillator circuit can only adjust the current of the crystal oscillator circuit, but cannot adjust the current of the bias circuit. The conventional bias circuit It is only responsible for providing a fixed current, and the current of the bias circuit will always be maintained at a constant value, so the power consumption of the crystal oscillator circuit is high, and the conventional automatic amplitude control circuit itself needs power consumption, which will also increase the power consumption of the crystal oscillator circuit. power consumption

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