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Frequency characteristic testing 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: 2015-04-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
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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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  • Frequency characteristic testing system based on virtual instrument
  • Frequency characteristic testing system based on virtual instrument
  • Frequency characteristic testing system based on virtual instrument

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Embodiment Construction

[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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Abstract

The invention discloses a frequency characteristic testing system based on a virtual instrument. The frequency characteristic testing system comprises a master computer and a slave computer, wherein the slave computer comprises a DDS (digital display scope) signal generator, an I / Q demodulator, a programmed gain amplifier, an AD (analogue-digital) converter and a single chip microcomputer; the master computer and the single chip microcomputer are subjected to two-way communication; the DDS signal generator generates two paths of orthogonal signals by program control of the single chip microcomputer; an Asin signal output end is connected into a tested circuit; signal stimulation is provided for the tested circuit; a signal output end of the tested circuit is connected with an input end of the I / Q demodulator; an Acos signal output end is connected with another input end of the I / Q demodulator; two input signals are subjected to down-conversion by the I / Q demodulator, so as to obtain two paths of direct current signals; the two paths of direct current signals are connected into the AD converter to be subjected to analogue-digital conversion after being amplified by the programmed gain amplifier of which the gain is set by the single chip microcomputer; the signal subjected to analogue-digital conversion is output to the master computer after being processed by the single chip microcomputer; the master computer achieves 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...

Claims

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Application Information

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IPC IPC(8): G01R31/28
Inventor 朱文忠刘小芳
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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