High-stability crystal oscillator circuit and implementation method

Abstract

The invention discloses a high-stability crystal oscillator circuit and an implementation method. The circuit comprises a broadband amplifier, a double-arm bridge network connected with the broadband amplifier, an amplifier connected with the double-arm bridge network, an amplitude limiter and an emitter follower, wherein the amplitude limiter and the emitter follower are connected with the amplifier through a DC blocking capacitor C403. The double-arm bridge network is composed of an RLC network and a crystal resonator. One end of the crystal resonator is connected with the broadband amplifier, and the other end is connected with the RLC network output end; the RLC network is connected in series with an adjustable resistor R402, an inductor L400 and a capacitor C401, and the capacitor C400 is connected in parallel with the two ends of the adjustable resistor R402, the inductor L400 and the capacitor C401 which are connected in series. The invention provides a novel oscillation circuit, which reduces the sensitivity of oscillation frequency to environmental conditions while ensuring other high-stability crystal oscillator technical means, and further improves the frequency stability index of the crystal oscillator.

Description

technical field [0001] The invention relates to the technical field of quartz crystal oscillators, in particular to a high-stability crystal oscillator circuit and an implementation method. Background technique [0002] As a precision frequency control device, quartz crystal oscillator occupies an important position in the field of electronic technology, and has always been the core device of various high-precision communication or information transmission equipment. With the rapid development of electronic information technology, quartz crystal oscillators are widely used in power systems, telecommunication, GPS applications, remote sensing, aerospace, precision testing instruments and various consumer electronics products. High-stability frequency reference is the guarantee of high-speed and high-quality signal transmission. The development of communication technology, especially the rapid development of high-speed optical fiber communication technology and wireless commu...

AI Technical Summary

Problems solved by technology

Since the Meacham bridge amplifier is a wide-band amplifier, it is difficult to design overtones, B-mode and other frequency selections. At the same time, due to the many parasitic oscillation modes of the crystal resonator, the circuit is relatively difficult to design and debug.

[0006] Higher frequency stability has been the pursuit of R&D technicians in the industry for nearly a century. Traditional crystal oscillator circuits are limited by temperature compensation accuracy, constant temperature control accuracy, and temperature characteristics of selected active and passive devices. room for improvement in terms of degree indicators is becoming more and more limited

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