SMD (Surface Mounted Device) micro constant-temperature crystal oscillator

Abstract

The invention discloses an SMD (Surface Mounted Device) micro constant-temperature crystal oscillator which comprises a temperature control circuit and an SMD temperature compensation crystal oscillator connected with the temperature control circuit. The SMD micro constant-temperature crystal oscillator is characterized in that the temperature control circuit comprises a temperature control chip, a thermistor, an MOS (Metal Oxide Semiconductor) transistor and a current-limiting resistor, wherein the thermistor, the MOS transistor and the current-limiting resistor are connected with the temperature control chip respectively and the thermistor and the MOS transistor are connected with the SMD temperature compensation crystal oscillator respectively. By using the crystal oscillator, high-precision temperature control of the constant-temperature crystal oscillator in a small volume, the better uniformity and stability of the crystal oscillator and the high integration and automatic debugging of the temperature control circuit are realized, therefore the crystal oscillator has a relatively high digitalization level and the batch production of the constant-temperature crystal oscillator can be realized easily; and the crystal oscillator has the advantages of small size, low power consumption and low manufacturing cost.

Description

Technical field [0001] The present invention relates to a crystal oscillator, and more specifically, to a miniature oven controlled crystal oscillator with high stability time reference and high stability. Background technique [0002] In the crystal oscillator design, in order to obtain higher frequency-temperature characteristics, we usually use the temperature control method of the crystal and its oscillation circuit to improve the frequency stability of the crystal oscillator, which is the so-called high-precision temperature control technology, which uses The crystal oscillator of temperature technology is called an oven controlled crystal oscillator. Oven-temperature crystal oscillators generally use the method of heating the crystal resonator, that is, the crystal resonator is heated by a heating temperature control circuit in the crystal oscillator, so that the temperature of the crystal resonator is controlled at a constant temperature value (usually 85°C). About), thro...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a SMD miniature constant temperature crystal oscillator, which solves the defects of complex circuits, low integration, large volume and power consumption in the existing crystal oscillator temperature control technology, and achieves small volume, low power consumption and high frequency- The purpose of temperature stability and high integration

Images