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The Microcomputer Compensated Crystal Oscillator Based on TLC320AC02I

Author: QuZuo
Tutor: ChenXiaoLin
School: Hunan University
Course: Microelectronics and Solid State Electronics
Keywords: Microcomputer Compensated Crystal Oscillator Frequency Stability Temperature Compensation
CLC: TN752
Type: Master's thesis
Year: 2005
Downloads: 108
Quote: 2
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Abstract


The rapid development of modern electronic technology for quartz crystal oscillator frequency stability, size, power consumption and other technical indicators of the ever-increasing demands. In order to adapt to the development, the paper designs a success in 14 AD / DA data processing chip TLC320AC02I and AT89C4051 microcontroller as the core of the new microcomputer-compensated crystal oscillator (MCXO), and a comprehensive introduction to the work of the microcomputer compensated crystal oscillator principle, the system structure and SCM software design. The article first departure from the general framework of the system described in detail the various parts of the hardware circuit design and functions: describes the AD / DA data processing chip TLC320AC02I of primary and secondary communication data format settings, AD / DA converter synchronization, chip-down and other functions to achieve Methods; from \This paper creatively proposes a MCXO on-line real-time measurement program, which makes the entire measurement process is digital control mode, and the system is fully encapsulated, thereby greatly reducing the systematic errors, improved temperature compensation accuracy to achieve a temperature compensated crystal Oscillators \System through the use of microprocessor this critical components, to achieve a temperature compensated crystal oscillator three linear interpolation fitting operation and automatically compensate for crystal aging and to provide a sealed state in the system frequency tuning function; while optimizing software and hardware design, greatly reducing the overall power consumption and size. The MCXO using resistance welding hermetic package, to improve the system against electromagnetic interference and environmental adaptability. Article concludes with a list of the Japanese Systec Research Company and Hunan University, two prototypes of the main items on the performance of the test results: Frequency Stability ≤ ± 2 × 10 -7 (-40 ℃ ~ 85 ℃ ), size 35 × 23 × 10mm 3 , the average power consumption ≤ 50mW. At present, the temperature compensated crystal oscillator in the research and production there is a big gap compared with developed countries, has not been a practical microcomputer compensated crystal oscillator product coverage. This article is designed microcomputer temperature compensated crystal oscillator has a frequency high stability, small size, low power consumption, easy to use, ideal for automated production and other characteristics, the composite indicator leading domestic level, has great application value.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Oscillation technique,the oscillator > Oscillator
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