一種應用于CAN收發(fā)器的寬輸入范圍的遲滯比較器設計
2021年電子技術應用第7期
馮世勤,,馮全源
西南交通大學 微電子研究所,四川 成都611756
摘要: 為了將CAN(Controller Area Network)總線上的-12~12 V的信號轉(zhuǎn)化為0~5 V的串行數(shù)字信號,,設計了一種應用于CAN收發(fā)器的寬輸入范圍的遲滯比較器,。實現(xiàn)的方案是先使用電阻將電源和總線上的信號線性疊加得到5 V電壓內(nèi)的信號,再使用全差分放大器進行鉗位,,使用共模反饋穩(wěn)定共模工作點,,最后使用對尾電流進行溫度補償?shù)膬?nèi)部正反饋的遲滯比較器比較得到數(shù)字信號?;赩IS 0.4 μm BCD工藝,,使用Hspice進行了仿真驗證。仿真結(jié)果表明:電路能夠?qū)?12~12 V的電壓比較得到正確的數(shù)字信號,。在常溫即25 ℃,,TT工藝角下,遲滯門限為108.9 mV,。在溫度從-40 ℃~125 ℃變化時,,遲滯門限電壓變化小于9.16 mV,溫度系數(shù)為0.055 5 mV/℃,。
中圖分類號: TN402
文獻標識碼: A
DOI:10.16157/j.issn.0258-7998.201253
中文引用格式: 馮世勤,,馮全源. 一種應用于CAN收發(fā)器的寬輸入范圍的遲滯比較器設計[J].電子技術應用,2021,,47(7):52-56.
英文引用格式: Feng Shiqin,,F(xiàn)eng Quanyuan. Design of a hysteresis comparator with wide input range for CAN transceiver[J]. Application of Electronic Technique,2021,47(7):52-56.
文獻標識碼: A
DOI:10.16157/j.issn.0258-7998.201253
中文引用格式: 馮世勤,,馮全源. 一種應用于CAN收發(fā)器的寬輸入范圍的遲滯比較器設計[J].電子技術應用,2021,,47(7):52-56.
英文引用格式: Feng Shiqin,,F(xiàn)eng Quanyuan. Design of a hysteresis comparator with wide input range for CAN transceiver[J]. Application of Electronic Technique,2021,47(7):52-56.
Design of a hysteresis comparator with wide input range for CAN transceiver
Feng Shiqin,,F(xiàn)eng Quanyuan
Institute of Microelectronics,,Southwest Jiaotong University,Chengdu 611756,,China
Abstract: A hysteresis comparator with wide input range for Controller Area Network(CAN) transceiver is designed to convert the
-12~12 V signals on CAN bus into 0~5 V serial digital signals. The solution is to use resistance to linearly superimpose the signals on the power supply and bus to get the signals in the 5 V voltage, then use full differential amplifier to clamp, use common mode feedback to stabilize the common mode working point, and finally use the internal positive feedback hysteresis comparator that can compensate the temperature of the tail current to get the digital signal. Based on VIS 0.4 μm BCD process, Hspice is used for simulation and verification. The simulation results show that the circuit can get the correct digital signal by comparing the voltage of -12~12 V. The hysteresis threshold was 108.9 mV at room temperature(25 ℃) and TT process corner. When the temperature changes from -40 ℃ to 125 ℃,,the change of hysteresis threshold voltage is smaller than 9.16 mV,the temperature coefficient is 0.055 5 mV/℃.
Key words : hysteresis comparator,;wide input range,;hysteresis threshold voltage;temperature compensation,;fully differential operational amplifier
0 引言
CAN總線作為一種現(xiàn)場總線,,因為其可靠安全、實時通信和靈活控制的特點,,在工程實踐中廣受工程師的歡迎[1],。CAN總線整體由物理總線、收發(fā)器和控制單元三部分構(gòu)成,。CAN收發(fā)器是負責MCU或DSP等CAN控制單元和物理總線之間信號傳遞的結(jié)構(gòu)[2],。CAN總線上的信號CANH和CANL是擺幅為-12~12 V的差分電壓信號,而CAN控制單元僅識別數(shù)字信號,,所以CAN收發(fā)器中的比較器需要將共模范圍為-12~12 V的模擬信號轉(zhuǎn)化為0~5 V的串行數(shù)字信號,。CAN收發(fā)器中比較器的性能對整個網(wǎng)絡系統(tǒng)的安全性、可靠性和電磁兼容性起到了關鍵作用[3],。本文設計的比較器目的就是將總線信號CANH和CANL得到的差分信號VID轉(zhuǎn)化為數(shù)字信號,,比較器輸出的遲滯范圍約為108.9 mV。
本文詳細內(nèi)容請下載:http://forexkbc.com/resource/share/2000003654,。
作者信息:
馮世勤,,馮全源
(西南交通大學 微電子研究所,四川 成都611756)
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