纳米光栅微陀螺前置放大电路的设计与分析
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摘要
针对纳米光栅微陀螺输出微安甚至皮安级的微弱电流信号,设计微弱电流信号的前置放大电路,研究微弱电流信号检测与电路稳定性的理论,提出一种低成本、低噪声、高信噪比的微弱电流检测方法,即高阻型的I-V转化法,并给出高阻型I-V转化电路的响应带宽计算公式以及电路稳定性的分析方法。通过搭建测试台,对电路性能及功能进行实际测试。实验结果表明:该电路可对皮安级的微弱电流信号进行检测放大,电路灵敏度为10 mV/pA,最大检测误差为1.5%(当输入微弱电流值>10 pA时),满足纳米光栅微陀螺的微弱电流检测的需求。
In this paper, a preamplifier circuit of weak current signal was designed for the output of microampere or even pico-ammeter level of Nano-grating micro-gyroscope. The theory of weak current signal detection and circuit stability was studied. A weak current detection method of high resistance I-V transformation type with low cost, low noise and high signal-to-noise ratio was proposed. The calculation formula of response bandwidth of high resistance I-V converter circuit and the method of circuit stability analysis were given. The circuit performance and function were tested by setting up a test bench. The experimental result shows that the circuit can detect and amplify the weak current signal of pA level. The circuit sensitivity is 10 mV/pA, and the maximum detection error is 1.5%(when the input weak current value is greater than 10 pA). This performance shows that the circuit can meet the need of weak current detection for nano-grating micro-gyroscope.
In this paper, a preamplifier circuit of weak current signal was designed for the output of microampere or even pico-ammeter level of Nano-grating micro-gyroscope. The theory of weak current signal detection and circuit stability was studied. A weak current detection method of high resistance I-V transformation type with low cost, low noise and high signal-to-noise ratio was proposed. The calculation formula of response bandwidth of high resistance I-V converter circuit and the method of circuit stability analysis were given. The circuit performance and function were tested by setting up a test bench. The experimental result shows that the circuit can detect and amplify the weak current signal of pA level. The circuit sensitivity is 10 mV/pA, and the maximum detection error is 1.5%(when the input weak current value is greater than 10 pA). This performance shows that the circuit can meet the need of weak current detection for nano-grating micro-gyroscope.
引文
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[10]闫书雄,辜键洲,石梦桐,等.用于飞行时间质谱仪的微电流检测模块[J].电子测量技术,2016,39(9):64-68.
[2]姜利英,岳保磊,梁茂,等.一种改进型微弱电流低噪声放大应用电路[J].郑州轻工业学院学报(自然科学版),2015,30(4):118-122.
[3]谭同,何慧敏,李宝霞,等.光电模块中微弱电流测量电路的设计与测试[J].电子设计工程,2017,25(9):6-13.
[4]王宾,李孟委,吴倩楠,等.纳米光栅微陀螺噪声分辨率分析[J].中北大学学报,2017,38(2):225-230.
[5]王宾,李孟委,吴倩楠,等.双层纳米光栅微位移检测仿真[J].仪表技术与传感器,2018,6(4):6-9.
[6]孙旭鸿,高守玮.基于ARM的微弱电流检测系统[J].工业控制计算机,2016,29(12):131-132.
[7]李忠晶,鞠登峰,周兴,等.基于巨磁电阻传感器的微弱电流测量方法研究[J].电测与仪表,2016,53(15):28-32.
[8]李烜,黄韬.基于静电探测理论的对空探测技术研究[J].光电技术应用,2017,32(3):54-58.
[9]胡红钱,高奇峰,沈姗姗.新型微弱电流检测前置放大电路设计[J].核电子学与核探测技术,2016,36(8):847-851.
[10]闫书雄,辜键洲,石梦桐,等.用于飞行时间质谱仪的微电流检测模块[J].电子测量技术,2016,39(9):64-68.