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Production line calibration method, device and system for equipment clock, self-calibration method and equipment

A technology of equipment clock and calibration method, which is applied in the direction of clocks, timing pulses, electronic timers, etc., can solve the problems of not being able to reach GPS, difficult to solve, and large frequency deviation, and achieve cost reduction, clock signal maintenance, and clock signal stability Effect

Active Publication Date: 2022-01-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

Compared with VC-TCXO / TCXO, the cost of DCXO is lower, but since DCXO itself has no frequency adjustment mechanism, it needs to solve static and dynamic frequency errors. Static errors can generally be adjusted through the calibration process, but dynamic errors, that is, with temperature The changing frequency drift is difficult to solve, especially it is difficult to accurately obtain the real-time frequency deviation corresponding to the current temperature, which leads to the situation that the client device cannot locate the satellite due to the large frequency deviation at very high temperature, which cannot meet the requirements of GPS.

Method used

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  • Production line calibration method, device and system for equipment clock, self-calibration method and equipment
  • Production line calibration method, device and system for equipment clock, self-calibration method and equipment
  • Production line calibration method, device and system for equipment clock, self-calibration method and equipment

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Embodiment Construction

[0034] According to the background art, the conventional clock source of the GPS module or TCXO DCXO, wherein the high cost TCXO; DCXO the error can not be solved with dynamic frequency drift temperature change generated, so that the GPS module is not accurate positioning .

[0035] For the above problem, the temperature sensor can be a crystal oscillator (Temperature Sensor CrystalOscillator, abbreviated TSXO) providing a clock for the device, and different TSXO ordinary crystal (Crystal Oscillator) is characterized by comprising a temperature sensor inside TSXO, the temperature sensor is a thermistor or temperature of the diode, while the output of the TCXO frequency TSXO unlike closed-loop feedback control, the output frequency TSXO not temperature compensated, which makes the output frequency TSXO affected by the temperature. However, the crystal corresponding clock as a reference clock the entire device system requirements must be precise, which requires such strict 26MHz cry...

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Abstract

A production line calibration method, device and system, self-calibration method and equipment for an equipment clock, the equipment includes a TSXO and a Bluetooth module, wherein the production line calibration method for the equipment clock includes: eliminating the The built-in frequency offset of the TSXO; the temperature drift of the TSXO is calibrated. Through this method, a low-cost and high-precision clock solution with a built-in positioning function can be provided for ubiquitous connected devices.

Description

Technical field [0001] The present invention relates to clock calibration in the field of smart devices, particularly to a production line calibration method, apparatus and system clock apparatus, method and apparatus for self-calibration. Background technique [0002] Nowadays, mobile communications handsets and networking technology is booming, and things develop without intelligent positioning technology, currently, the use of global positioning module (Global Positioning System, referred to as GPS) intelligent positioning. Pan connecting a mobile communication apparatus such as mobile phones, computers, etc., generally comes with a mobile connection module (Connectivity) and a global positioning module (Global Positioning System, referred to as GPS). Wherein the mobile connection module may include a Bluetooth module (BlueTooth, referred to as BT) or a wireless network connection module (Wireless-Fidelity, referred to as WIFI). [0003] The GPS module, the clock source genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G04G3/04G04R20/02
CPCG04G3/04G04R20/02
Inventor 元恒敏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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