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Relying on the virtual instrument technology of LabVIEW, using co-simulation of LabVIEW and Multisim, the paper designs and developed a high-frequency power amplifier analyzer based on the virtual instrument technology.Using the powerful programming and data processing capabilities of LabVIEW, parameters can be set and acquired, the effect of the bias resistance on the conduction angle is studied, the influence of conduction angle on output power, collector efficiency and waveform of emitter output signal are analyzed, the integration of measurement, display and analysis have been realized. With the combination of data and graphics, the changes due to bias resistance or conduction angle in the circuit output are visually displayed on the instrument interface. The analyzer improves the intuitiveness and accuracy of circuit parameter setting and performance analysis, provides an efficient automated simulation training platform for circuit key parameter design and dynamic performance analysis. [ABSTRACT FROM AUTHOR]

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This paper adopted virtual instrument technology to realized the visualization and control of the quiescent operating point Q by using LabVIEW-Multisim. The impact of quiescent operating point setting on start-oscillation characteristics, including start-oscillation time, oscillation amplitude and stability of oscillation frequency were displayed in real time. This paper also realized the automation of experiment data measurement, recording and plotting by using the powerful data collection and processing function of LabVIEW. The amount of LC oscillator start-oscillation process that can't be measured by physical instrumentation was displayed intuitively and clearly in the virtual instrument panel developed by the authors. It greatly improved the efficiency of the experiment, practiced the teaching idea of " transforming abstraction into concrete" advocated by engineering subject. [ABSTRACT FROM AUTHOR]

The "isolation" teaching style in the field of electronic teaching in colleges and universities which caused by the asynchrony of theory, simulation and test, lets students not only shuttle between classrooms and laboratories, but also struggle between theory and practice. In order to solve this problem, by integrating these on a same platform, students can achieve the rapid integration and absorption of knowledge. By using LabVIEW and Multisim, we designed an analysis and testing instrument for free oscillation characteristic of two order RLC circuit. Results show that compared with general physical oscilloscopes, the analyzer can capture the transient charging and discharging process of two order RLC circuit by showing the processes described by complex mathematical formulas in waveform dynamically in real time. It can also help students to study how the oscillation characteristics are influenced by circuit parameters. [ABSTRACT FROM AUTHOR]

The analysis for tuned amplifier has been carried out through Multisim 13. 0 software. The suitable components which influence quiescent point were selected by sensitivity analysis, it is a quantitative analysis. The suitablecomponents of the biasing circuit were selected by parametric scanning analysis, and the importance of setting suitable quiescent point was proved. The suitable emitter resistances were selected by parametric scanning analysis and temperature scanning analysis. Al approved the stability of amplifier. The result were visual and precise, and could prove the theory very well. It was verified that the software has powerful simulation and analysis function. With the help of the software, we can convert the traditional qualitative analysis to quantitative analysis. The analysis and design of high frequency circuit are not only more precise and credible, but also more closed to the real circuit running status. [ABSTRACT FROM AUTHOR]