A Frequency Characteristic Test System Based on Virtual Instrument
A technology of frequency characteristics testing and virtual instruments, applied in the direction of electronic circuit testing, etc., can solve the problems of inconvenient portability, weak calculation and analysis functions, and high price, and achieve high cost performance, improve frequency characteristics analysis functions, and powerful calculation and analysis effect of ability
Active Publication Date: 2017-10-27
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a frequency characteristic test system based on virtual instruments for the problems of weak calculation and analysis functions, high price and inconvenient portability of traditional frequency characteristic testers
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[0029] A frequency characteristic test system based on a virtual instrument provided by the present invention includes a software part and a hardware part. The software part is an application software designed based on the Matlab virtual instrument software development platform. The software runs under Windows XP. Through the design of a friendly human-computer interaction interface, it is responsible for sending various signals, operating instructions, receiving and processing data, and displaying signal waveforms. , to realize automatic testing of the circuit network under test. The hardware part includes upper computer system and lower computer system; upper computer system includes computer; lower computer system includes DDS signal generator, I / Q demodulator, programmable gain amplifier, AD converter and single-chip microcomputer with USB interface.
[0030] 1. Overall scheme design: such as figure 1 As shown, the present invention takes the single-chip microcomputer as ...
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The invention discloses a frequency characteristic testing system based on a virtual instrument, which includes an upper computer and a lower computer, and the lower computer includes a DDS signal generator, an I / Q demodulator, a program-controlled gain amplifier, an AD converter and a single-chip microcomputer; the upper computer and the The single-chip microcomputer performs two-way communication; the single-chip microcomputer program-controlled DDS signal generator generates two orthogonal signals, in which the output terminal of the Asin signal is connected to the circuit under test to provide signal excitation for the circuit under test, and the signal output terminal of the circuit under test is demodulated with I / Q connected to one input terminal of the device, and the Acos signal output terminal is connected to the other input terminal of the I / Q demodulator. The program-controlled gain amplifier with set gain is amplified and connected to the AD converter for analog-to-digital conversion. The signal after the analog-to-digital conversion is processed by the single-chip microcomputer and then output to the host computer. The host computer realizes data calculation, analysis, and display through Matlab software.
Description
technical field [0001] The invention relates to the technical field of electronic measurement and signal processing, in particular to a frequency characteristic testing system based on a virtual system device. Background technique [0002] The frequency characteristic of the circuit network is an important circuit parameter in the field of electronic measurement and signal processing research. The quality of the frequency characteristic directly affects the performance indicators of the instrument where it is located. For example, in a digital oscilloscope, the frequency characteristics of the input signal conditioning circuit determine important indicators such as the passband bandwidth, passband flatness, and measurement accuracy of the whole machine. Another example is the frequency characteristics of the output channel in the signal generator, which determines the bandwidth, flatness and accuracy of the output signal amplitude. During the development of these electronic...
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IPC IPC(8): G01R31/28
Inventor 朱文忠刘小芳
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING