Aging compensating circuit of constant temperature crystal oscillator

Abstract

The invention relates to an aging compensating circuit of a constant temperature crystal oscillator and relates to the crystal oscillator technology field. The invention assists in solving a technical problem of aging property correction. The circuit comprises a one-chip microcomputer, an erasable memory and a digital-analog converter, wherein the one-chip microcomputer is provided with a voltage-controlled data output port; the erasable memory is connected with the one-chip microcomputer through a data bus; a digital signal input port of the digital-analog converter is connected with the voltage-controlled data output port of the one-chip microcomputer; a simulation signal output end of the digital-analog converter is connected with a voltage-controlled end of the constant temperature crystal oscillator through a resistor; and ground connection of the voltage-controlled end of the constant temperature crystal oscillator is carried out through a varactor. According to the circuit provided by the invention, aging property correction of the constant temperature crystal oscillator can be carried out timely.

Description

technical field [0001] The invention relates to crystal oscillator technology, in particular to the technology of an aging compensation circuit of a constant temperature crystal oscillator. Background technique [0002] Oven Controlled Crystal Oscillator, referred to as Oven Controlled Crystal Oscillator, or OCXO (Oven Controlled Crystal Oscillator) in English, is a crystal oscillator that uses a constant temperature bath to keep the temperature of the quartz crystal resonator constant and minimizes the output frequency change caused by ambient temperature changes. device. Constant temperature crystal oscillator is a high-end frequency basic component. As a signal source reference, it is widely used in synchronization equipment timing, measuring instruments, communication base stations and other fields. [0003] The performance of the constant temperature crystal oscillator requires not only good short-term stability, but also good enough long-term stability. However, due t...

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Problems solved by technology

[0004] Traditional constant temperature crystal oscillators use mechanical adjustment to correct the aging value. This correction method cannot correct the aging value in time. It is often corrected after the output frequency is unstable, which will affect the normal use of the application equipment.

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