A New Differential Crystal Oscillator Circuit

By using bipolar transistors in the differential crystal oscillator circuit and adding auxiliary vibration start circuit, the vibration start and phase noise problems of traditional differential crystal oscillators are solved, and better stability and noise performance are achieved.

CN114900130BActive Publication Date: 2025-03-18SINOWAY TECH (WUXI) CO LTD
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Patent Information

Application Number
CN202210587463.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-05-27
Publication Date
2025-03-18
Estimated Expiration
2042-05-27

AI Technical Summary

Technical Problem

When using bipolar transistors, traditional differential crystal oscillators are prone to cause vibration problems under mismatch conditions, and due to the flickering noise of the metal field effect tube, the output phase noise is poor.

Method used

A new differential crystal oscillator circuit was designed, using bipolar transistors as gain tubes, and the vibration problem was solved by adding auxiliary vibration start circuits, including low-resistance paths and field effect transistors.

Benefits of technology

It effectively reduces the phase noise at the output terminal, avoids the start-up problem of bipolar transistors under mismatch conditions, and improves the stability of the oscillator.

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Abstract

The invention discloses a novel differential crystal oscillator circuit, comprising an oscillator, a first load, a second load, a fifth resistor, a sixth resistor, a first bipolar transistor, a second bipolar transistor and a low-resistance path for assisting the oscillator in starting oscillation; one end of the oscillator is connected to the collector of the first bipolar transistor, the collector of the first bipolar transistor is connected to an external power supply through the first load, and is connected to the base of the second bipolar transistor; the other end of the oscillator is connected to the collector of the second bipolar transistor, the collector of the second bipolar transistor is connected to the external power supply through the second load, and is connected to the base of the first bipolar transistor; one end of the low-resistance path is connected in parallel with the oscillator, the other end of the low-resistance path is connected to the base of the first bipolar transistor through the fifth resistor, and the other end of the low-resistance path is connected to the base of the second bipolar transistor through the sixth resistor.
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