Low-jitter differential crystal oscillator

Abstract

The invention discloses a low-jitter differential crystal oscillator, which comprises a base, a metal cover plate, a quartz oscillator and a low-jitter differential chip, the base is provided with a groove with an upward opening; the low-jitter differential chip is electrically connected with a bonding pad at the bottom of the groove, and is used for cooperating with the quartz oscillator to generate an oscillation loop, performing phase-locked frequency multiplication on fundamental oscillation frequency generated by the quartz oscillator, and finally outputting a high-frequency differential signal; the quartz oscillator is arranged above the low-jitter differential chip and is used for cooperating with the low-jitter differential chip to generate an oscillation circuit; the metal cover plate is welded to the top of the base through the parallel welding packaging technology. The problem that low jitter and wide temperature range work cannot be met in a traditional differential crystal oscillator is solved, the indexes that the period jitter of the differential crystal oscillator is better than 30ps and the frequency stability is smaller than or equal to + / -65ppm in the wide temperature range of-55 DEG C to + 125 DEG C are achieved by optimizing the product structure and the debugging method, and the SMD5032 boundary dimension of the product is achieved through the miniaturization and integration design.

Description

technical field [0001] The present invention relates to the technical field of oscillators, in particular to a low-jitter differential crystal oscillator. Background technique [0002] With the wide application of differential crystal oscillators in electronic equipment, higher requirements are put forward for differential crystal oscillators in terms of volume, jitter, frequency and temperature stability, etc. Therefore, it is necessary to design differential crystal oscillators for miniaturization and low jitter to achieve small products The characteristics of modernization and high index meet the relevant requirements of electronic equipment. [0003] The traditional differential crystal oscillator requires the product to work at a temperature range of -40°C to +85°C in the working environment, which cannot meet the requirement of frequency stability ≤±65ppm in a wide temperature range of -55°C to +125°C, so it cannot meet the requirements of low jitter differential The ...

AI Technical Summary

Problems solved by technology

[0004] An object of the present invention is to provide a low-jitter differential crystal oscillator, which solves the problem that traditional differential crystal oscillators cannot meet the requirements of low jitter and wide temperature range operation, and realizes the differential crystal oscillator period jitter (peak-to-peak value) ) is better than 30ps and the frequency stability in the wide temperature range of -55°C to +125°C is ≤±65ppm. Through the miniaturization and integration design, the product's SMD5032 size is realized.

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