Measurement of Amplifier Open-Loop Amplitude Frequency Characteristics Based on Virtual Instrument

Abstract:

In the electronic measurement field, how to measure the open-loop amplitude frequency characteristics of the amplifier automatically is a question to be overcame. And now , the system ,which under the integrated development environment that the virtual instrument software LabVIEW provides, to measure the open-loop amplitude frequency characteristics of the amplifier is developed by combining the modern electronic measurement technology and computer data processing technology. The virtual signal generator which is based on the data acquisition card, signal acquisition, correlation analysis, frequency response analysis, etc is included in the system. This design mainly includes the hardware circuit and the software program. The hardware circuit consists of the low noise preamplifier, measured operational amplifier, data acquisition card, power supply, computer, etc. Modular design is adopted in the software part, which includes the design of soft panel, signal generation, collection and analysis module. The advantages of the virtual instrument, such as the digital signal processing, waveform data automatic storage, graphical programming, are fully used in the modern electronic measurement. Simple structure, low cost, high level of test automation are its characteristics.

• Periodical: Applied Mechanics and Materials (Volumes 475-476)
• Pages: 16-22
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.475-476.16
• Online since: December 2013
• Authors: Tian Tian*, Wu Jian, Nie Li
• Keywords: Amplifier, Amplitude-Frequency Characteristics, Software Cross-Correlation, Virtual Frequency Sweep Signal Source, Virtual Instrument (VI), Weak Signal

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