Automatic Measurement Of The Analog Circuits Parameters

Studies on the circuits usually focus on the amplifying circuits, the rectified filter circuits, the amplitude-limiting circuits and so on, while neglecting the study of the analog circuit parameters and the measure methods. But it can not be separated from the analog circuit parameters in the actual application. It is necessary to study the analog circuits parameters and the measurements. Software and hardware are two main ways of the current analysis and design of the analog circuits. Pspice, Multism and other circuits simulation software is used to simulate the analog circuits for the parameters in our country. However, the simulation software is often trial versions or the teaching editions, and the libraries of components are not complete. At the same time, the simulation and practical components are different, so the results of the simulation and the actual value are not the same. The frequency scanner, distortion analyzer, spectrum analyzer are often used in the laboratory. Because the cost and the quality of these instruments are high. Meanwhile the operation is complex, it is not widely applied. More important, they can only measure a single analog circuits parameter. A number of parameters are measured are impossible in a device. So it is essential to study the existing analog circuit parameters of measurement.In this paper, the measurement of the analog circuits parameters are studied in-depth atfirst. The PCI-6024E data acquisition card based on the NI's PCI bus are taken advantage of collecting real-time signal of the analog circuits. The acquired real-time signal of the analog circuits is processed in the virtual instrument platform (LabVIEW).A new method of the measurement of the analog circuits parameters are designed, that is, the multiplier based on the measurement of analog circuit parameters. The basic principles of the method are described. The method proves to correct and feasible by the theoretical analysis, simulation and the use of hardware. The hardware platform contains a phase-shifting circuit made by the author as signal source with the two orthogonal signals, a first-order RC circuit and the co-emitting amplifying circuit as the test of analog circuits. The functions of multiplication and filtering are realized with the welding components of the PCB as a signal processing circuit. The results show that the method has a high accuracy, a simple principle, a small amount of the calculation. It is relatively easy to achieve. At the same time the measurement has been compared with the others lies in a better real-time and automatic.Finally, the author accomplishes the data management system of the measurement of the analog circuits parameters taking advantage of free database access tool of the LabVIEW—LabSQL. As a matter of fact managing the collected data is effective by the database.