摘  要：對于現在更高的數據速率和串行總線，用戶需要專用工具來設計、調試和驗證設計。示波器噪聲、觸發器抖動和探針保真度都可能影響用戶對低電壓差分信號的測量。時鐘信號一般嵌入在用戶數據中，該數據可能經過8b/10b編碼，因此調試這種信號需要使用智能的示波器。當設計完成后，用戶必須進行一致性測試，這意味著要在短時間內進行很多復雜的測試。標準示波器對此無能為力。本設計通過線性移位寄存器發生器產生m序列的數字信號和偽隨機信號，數據率誤差絕對值均≤１%，其中數字信號發生器采用了曼斯特編碼，時鐘數據率在10~100kbps內以10kbps步進可調，偽隨機信號數據率為10Mbps。兩路信號的時鐘，均由序列的FPGA產生。低通濾波器由無限增益多路反饋二階低通濾波電路實現。兩路信號由高速運放AD811進行信號疊加后輸入示波器，顯示數字信號的信號眼圖。數字信號分析儀所采用的時鐘信號，通過開關切換，可使用數字信號發生器的時鐘信號，也可以使用FPGA及其外圍電路提取的同步時鐘信號。本系統由兩部分組成：1.數字信號發生器同時通過三個低通濾波器和一個偽信號發生器用來模擬傳輸信道。2.乘法器和三個低通濾波器所組成的數字信號分析電路，提取有效數字信號。

關鍵字：m序列發生器；同步信號提取；曼徹斯特編碼

Abstract:This topic is the widening project of " low-temperature wind driven generator basing on Cortex-M3 processor ".The wind driven generator in the original project has a bad field working environment since the  monitoring station is remote from the wind generator. The way of direct transmission of the signal will cause a certain degree of waste and inconvenience, while wireless transmission can make up the above shortcomings. 

      The system described in this passage has been successfully completed designed and produced .The system is a embedded temperature data detection system that made up of SCM AT89S52 and RFIC nRF905 and several other modules. The design of the temperature detection system adopts advanced digital temperature sensor. 

      This paper describes the system's specific work flow in detail, and on this basis gives out the workflow diagram of RFIC and the structure chart of hardware design of the  wireless data detection part and wireless host part. System software programming adopts the C language. 

      The system has passed the lab test. The test results show that the temperature measurement accuracy of the whole system reaches ± 0.5 ℃, Measurement accuracy of the instrument system 0.5 Level and the wireless transmission range goes up to 300 meters, and the system performance stay stable within 300 meters . The system also has good resistance to electromagnetic interference .So far the performance of the entire system has completely met the design expectations. 

      This system is not only for " low-temperature wind driven generator basing on Cortex-M3 processor " system, but also can be used for remote sensing, remote control, wireless meter reading, industrial data acquisition and home automation and other fields. Have some practical value.

Key words: temperature; wireless transceiver; SCM; sensor