CN-122001299-A - Low-power-consumption miniaturized constant-temperature crystal oscillator based on SiC surface heat conducting film

CN122001299ACN 122001299 ACN122001299 ACN 122001299ACN-122001299-A

Abstract

The invention provides a low-power-consumption miniaturized constant-temperature crystal oscillator based on a SiC surface heat conducting film, which comprises a voltage stabilizing circuit, a quartz crystal with the heat conducting film, a temperature control module, a driving detection circuit, an amplifying circuit and a filtering circuit, wherein the voltage stabilizing circuit is used for providing direct current points for all circuit modules, the driving detection circuit is used for providing proper driving signals for the quartz crystal and detecting resonance states of the crystal in real time and feeding detection signals back to a subsequent circuit, the amplifying circuit is used for linearly amplifying weak resonance electric signals generated by the quartz crystal, the filtering circuit is used for filtering noise in amplified signals and reserving fundamental frequency signals corresponding to crystal resonance, and the quartz crystal with the heat conducting film is used for generating stable resonance frequency through piezoelectric effect.

Inventors

LIU SHA
ZHANG SHENGKANG
XU HUIHUI
WANG CHAO
WANG JIANBING
LI YING
YUAN YAN
LI BOHONG
WU HUANHUAN

Assignees

北京无线电计量测试研究所

Dates

Publication Date: 20260508
Application Date: 20251226

Claims (10)

1. The low-power-consumption miniaturized constant-temperature crystal oscillator based on the SiC surface heat conducting film is characterized by comprising a voltage stabilizing circuit, a quartz crystal with the heat conducting film, a temperature control module, a drive detection circuit, an amplifying circuit and a filter circuit; The voltage stabilizing circuit is used for providing direct current points for all circuit modules, the driving detection circuit is used for providing proper driving signals for the quartz crystal, detecting the resonance state of the crystal in real time and feeding back detection signals to a subsequent circuit, the amplifying circuit is used for linearly amplifying weak resonance electric signals generated by the quartz crystal, the filtering circuit is used for filtering noise in the amplified signals and retaining fundamental frequency signals corresponding to crystal resonance, and the quartz crystal with the heat conducting film is used for generating stable resonance frequency through a piezoelectric effect.
2. The miniaturized constant temperature crystal oscillator with low power consumption based on the SiC surface heat conducting film according to claim 1, wherein the temperature control module comprises a thermistor, a heating element and a temperature control circuit.
3. The miniaturized constant temperature crystal oscillator based on the low power consumption of the Si C surface heat conducting film according to claim 2, wherein the temperature control module is used for stabilizing the quartz crystal resonator at a zero temperature coefficient point through closed loop control of temperature acquisition, signal processing and power adjustment.
4. A miniaturized constant temperature crystal oscillator based on SiC surface heat conducting film according to claim 3, characterized in that the temperature interval of the zero temperature coefficient point is 80-95 ℃.
5. The miniaturized constant temperature crystal oscillator based on the SiC surface heat conducting film, which is disclosed in claim 4, is characterized in that the quartz crystal with the heat conducting film comprises a quartz crystal, a silicon carbide SiC layer, an upper electrode and a lower electrode.
6. The miniaturized constant temperature crystal oscillator based on the SiC surface heat conduction film, which is characterized in that alpha-quartz phase single crystal quartz is selected as a substrate, ST cut is selected according to the requirement of constant temperature crystal oscillator frequency stability, and the surface of the substrate is subjected to precise polishing treatment.
7. The miniaturized constant temperature crystal oscillator based on the SiC surface heat conduction film with low power consumption, which is disclosed in claim 6, is characterized in that the silicon carbide SiC layer and the quartz crystal form a quartz matrix-silicon carbide directional heat conduction network structure, and SiC is combined with the quartz matrix in a nano particle form through lattice matching design to construct a directional heat conduction channel.
8. The miniaturized constant temperature crystal oscillator based on the SiC surface heat conduction film, which is characterized in that the upper electrode is made of metal material gold, the thickness range is 100-300nm, the upper electrode is used for receiving an electric signal output by an oscillating circuit, an alternating electric field is applied to a quartz crystal, and meanwhile, the upper electrode is used as an electric signal feedback end to conduct a weak electric signal generated by crystal resonance to a subsequent amplifying and filtering circuit.
9. The miniaturized constant temperature crystal oscillator with low power consumption based on the SiC surface heat conducting film according to claim 8, wherein the lower electrode is made of a high heat conducting metal material copper alloy, is closely attached to the heat conducting film, and is used for rapidly receiving heat transferred by the heating element, uniformly conducting the heat to the crystal body and leading out weak joule heat generated during operation of the crystal.
10. The miniaturized constant temperature crystal oscillator based on SiC surface heat conducting film of claim 9, wherein the amplifying circuit is further used for compensating for losses in signal transmission.

Description

Low-power-consumption miniaturized constant-temperature crystal oscillator based on SiC surface heat conducting film Technical Field The invention relates to the technical field of crossing of a microelectronic technology and a piezoelectric frequency control device, in particular to a low-power-consumption miniaturized constant-temperature crystal oscillator based on a SiC surface heat conducting film. Background An oven controlled crystal oscillator (OCXO) is a high precision frequency source whose core principle is to place a quartz crystal resonator in a controlled constant temperature environment to cancel interference of ambient temperature fluctuations with the resonant frequency. The device is widely applied to high-precision electronic systems such as communication, test measurement, navigation positioning, aerospace and the like, and is a core device for guaranteeing stable operation of the system. With the rapid development of electronic devices toward miniaturization, portability, low power consumption and high reliability, the inherent technical defects of the conventional OCXO have gradually become a key bottleneck restricting the technical upgrade in the related art, and are specifically presented as the following challenges: (1) The power consumption is high, and the endurance of the portable equipment is restricted, wherein the heat conductivity of a quartz crystal body of the traditional OCXO is low (about 1.4W/m.K), and the heat resistance of heat transferred from a heater to a crystal vibration core is as high as 10 4～105 K/W. In order to overcome the high thermal resistance and maintain the target temperature (usually 60-85 ℃), the preheating stage needs to output 1-3W peak power, and the steady-state stage needs to continuously output 0.3-1W maintaining power. For battery-powered portable devices (e.g., handheld spectrum analyzers, field monitoring terminals), this power consumption level can lead to a reduction in endurance to several hours, severely limiting the application scenarios. (2) The size is large, and the miniaturization requirement cannot be met, namely, in order to ensure the uniformity of a thermal field and reduce heat loss, a huge constant temperature tank structure needs to be designed in the traditional OCXO, namely, a cavity is generally constructed by adopting a plurality of layers of heat insulation materials (such as ceramics and polyimide), and enough heat buffering space is reserved in the cavity, so that the whole packaging volume is generally more than 20 multiplied by 8mm 3. This contradicts the stringent requirements of modern electronic devices (e.g., 5G micro base stations, wearable devices) on component volumes (requirements of 10×10×3mm 3 or less), and it is difficult to achieve system integration. (3) The preheating time is long, the response speed is insufficient, the heat transfer delay is caused by the low thermal conductivity of the quartz crystal body, the preheating time (from room temperature to target temperature and stability) of the traditional OCXO is usually 2-5 minutes, and the requirements of scenes such as emergency communication, quick start of test equipment and the like on instant response (the requirement is less than or equal to 60 seconds) cannot be met. (4) The prior improved proposal has inherent defects In the prior art, in order to reduce power consumption and reduce size, researchers have tried various schemes, and two approaches of optimizing a heating circuit and a heat insulating material are typical. However, the existing method can only reduce the power consumption by 10% -20% and the volume by 20%, and cannot fundamentally solve the core problem of low heat conduction efficiency. Therefore, how to improve the heat transfer efficiency, the rapid preheating start, the low working power consumption, the compact structure and the stable performance becomes one of the prior art problems to be solved. Disclosure of Invention The invention provides a low-power-consumption miniaturized constant-temperature crystal oscillator based on a SiC surface heat conducting film, which is used for improving heat transfer efficiency, and has the advantages of quick preheating starting, low working power consumption, compact structure and stable performance. In the first aspect, a low-power-consumption miniaturized constant-temperature crystal oscillator based on a SiC surface heat conducting film is provided, and the low-power-consumption miniaturized constant-temperature crystal oscillator comprises a voltage stabilizing circuit, a quartz crystal with the heat conducting film, a temperature control module, a drive detection circuit, an amplifying circuit and a filter circuit; The voltage stabilizing circuit is used for providing direct current points for all circuit modules, the driving detection circuit is used for providing proper driving signals for the quartz crystal, detecting the resonance state of the crystal in real time and feedin