共查询到20条相似文献,搜索用时 93 毫秒
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本文介绍了数模转换器DAC7811的结构、工作原理及应用电路,并介绍了用单片机MSP430控制DAC7811实现程控增益放大器的方法。 相似文献
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程控技术在仪表中的应用 总被引:1,自引:0,他引:1
本文介绍了可编程放大器(PGA)在仪表中的几种用途。较祥细地讨论了PGA的3种基本组成方法及特点。同时,也指出了提高增益精度的一些措施 相似文献
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针对某型检测系统数据采集需求,运用数字电位器可编程控制阻值功能,设计了增益可自适应调整的数据采集系统,解决了ADC输入信号幅度动态范围不稳定的问题.描述了数据采集系统的设计过程,给出了硬件设计电路和软件结构框图,详细分析了仪表放大器、增益调节放大器的工作原理和实现方法,对于类似系统和电路的设计有一定的参考价值. 相似文献
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程控增益技术在数据采集中的应用 总被引:2,自引:0,他引:2
介绍了一种实用的程控增益技术,该技术利用DAC0832作为程控增益放大器,具有良好的控制特性,线性度好。文中详细介绍了其软、硬件设计,并给出了测试结果。实践证明设计是可行的,且已产生了较好的社会效益和经济效益。 相似文献
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本文介绍了数字荧光示波器1.2GHz带宽前置放大器的设计方法。首先介绍了系统的总体设计,然后给出了各个模块的设计,主要包括无源衰减网络的设计、阻抗变换网络的设计以及数控增益放大器的设计这三个部分。经过分析证明,该前置通道放大器实现了示波器基本功能,各项功能均能达到指定要求。与传统前置模拟通道放大器相比,该模拟通道放大器具有更高的带宽、更小的插入损耗等优点。 相似文献
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A. A. Titov 《Instruments and Experimental Techniques》2002,45(2):210-212
An ultrabroadband power amplifier with automatic control of the consumption current intended for operation into an unmatched load is described. To control the amplifier consumption current and gain, voltage sensors and output-current sensors are used at the amplifier output. The amplifier passband is 20–240 MHz; gain flatness, ±1.5 dB; gain, 40 dB; maximal output power, 20 W minimum; consumption current under no-signal condition, 2.2 A; and under peak-load conditions, 6.8 A. 相似文献
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测量放大器具有很强的抑制共模信号的能力,但由于电路的分析过程非常复杂,通常只在电路理想情况下,给出电路的差模增益.本文在电路非理想的情况下,分析了测量放大器抑制共模信号的机理,给出了放大器的差模、共模增益以及共模抑制比表达式.结论对测量放大器的设计和应用具有一定的指导意义. 相似文献
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Koçum C 《The Review of scientific instruments》2011,82(8):084702
The design of a digitally gain controlled high-voltage non-inverting bipolar linear amplifier is presented. This cost efficient and relatively simple circuit has stable operation range from dc to 90 kHz under the load of 10 kΩ and 39 pF. The amplifier can swing up to 360 V(pp) under these conditions and it has 2.5 μs rise time. The gain can be changed by the aid of JFETs. The amplifiers have been realized using a combination of operational amplifiers and high-voltage discrete bipolar junction transistors. The circuit details and performance characteristics are discussed. 相似文献
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ABSTRACT Details of a data acquisition system controlled by a SYM-1 single-board microcomputer are presented. The total cost of constructing the system was approximately $300. The system's variable gain amplifier coupled with a 10 bit analog-to-digital converter can be used to interface the SYM-1 to many laboratory instruments. In this report the data system is used to digitally integrate sample peaks from a high pressure liquid chromatograph. 相似文献
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涡街信号的幅值随频率成平方关系而变化,输出信号幅值的差别很大。为了保证测量精度,要求信号幅值控制在一个合适的范围内。为此,采用数字电位器和低功耗运算放大器研制了一种程控放大器。通过TMS320LF2407A DSP芯片计算涡街信号的绝对平均值来确定和调节放大器的增益,以适应涡街信号幅值的变化。实验结果表明,程控放大器的设计和幅值调整方法是有效的。 相似文献
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Lu SS 《The Review of scientific instruments》1979,50(6):772
A simple constant-temperatue hot-wire anemometer has been analyzed and tested in a shock tube and by electronic tests. In the derivation of the governing equations, the finite open-loop gain of an operational amplifier is considered. The measured values of the natural frequency and the damping coefficient for the anemometer system are in satisfactory agreement with the theory. For short probe cables, the frequency response is found to be limited by the finite open-loop gain of the amplifier. 相似文献
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A. A. Titov 《Instruments and Experimental Techniques》2002,45(5):665-667
A power amplifier is described in which, in order to combine the powers of channel amplifiers, directional couplers are used that are based on helical transmission lines placed in a cylindrical shield. The amplifier maximum output power is 200 W, the passband is 154–170 MHz, and the gain is 18 dB. The amplifier withstands a sudden prolonged load disconnection or short-circuiting when high-power (as high as 100 W) signals are applied to its input. 相似文献