The Development Of Virtual And Actual Integrated Remote Experiment Platform About Frequency Selective Amplifier Circuit

The realization of teaching effect can not be separated from the cultivation of practical ability.Experiment is an indispensable link in helping students to deepen their understanding of the theoretical knowledge and enhance their operation abilities.With the continuous improvement of the complexity of the system circuit,with the help of circuit simulation tools to improve student engineering design capabilities and solve practical problems has become an inevitable trend.At present,most of the laboratories in colleges and universities are based on confirmatory experiments,while virtual simulation experiments only exist as a supplementary form of extra-curricular self-training,and "virtual" and "real" are separated in the teaching link.And then the virtual simulation experiments have the advantages of flexible settings of circuit parameters,which make up for the difficulties in changing the hardware circuit parameters.Integrating computer network technology,virtual simulation technology and virtual instrument technology to build the virtual and actual integrated remote-Controlled experiment platform has become an urgent need.This paper use Multisim as the simulation engine and implement NI ELVIS as a hardware platform,use the Lab VIEW as the experiment development platform,design and implement a circuit integration experiment platform of virtual-real fusion.The platform will closely combine the simulation analyses of circuit performances and the testing of the physical circuits to complete the fusion of real circuits and virtual circuits.In addition,using Lab VIEW Web publishing technology to achieve the remote access to the platform of virtual-real fusion.Firstly introduce the basic principle and characteristics of the frequency selective amplifier circuit and complete the circuit design.And then build a simulation model of the amplifier circuit in Multisim and use its powerful simulation analysis function to complete the simulation analyses of amplifier circuit performance,including the setting of the static bias circuit of the frequency selective amplifier and AC characteristics.Based on analyses,find out the key circuit elements that influence the DC and AC characteristics of the amplifier circuit and carry on reasonable parameter settings,which lays the foundation for the development of the experiment platform.Secondly,optimize the circuits by simulation analyses and complete the PCB design.It mainly includes the designs of single and double tuned frequency selective amplifier circuit,a circuit to achieve remote switch,communication Interface between hardware circuit and NI ELVIS Platform.Using Lab VIEW-Multisim joint technology to combine the data acquisitions?measurements of Lab VIEW with the powerful circuit analysis functions of Multisim and complete the design of automatic simulation analysis platform.Through using the platform,users can flexibility set the circuit component parameters and intuitively obtain the influence on circuit performance when circuit parameters changes.Immediately after that,the interface of virtual-real fusion experiment was developed by using sub VI technology in Lab VIEW.Complete the simulation analyses of the circuit that based on the Multisim and the testing of hardware circuit that connected to the ELVIS platform in the interface.At last,the remote access of experiment platform is completed by using Web publishing technology of Lab VIEW.Users can log in to the experiment platform remotely,set the circuit component parameters in the interface to carry on the circuit performance research and complete the hardware circuit performance test.This paper integrates a series of software,such as the Multisim?Lab VIEW,and NI ELVIS into one platform.Users only need to visit the Web server,the login interface can be verified to enter the remote experiment platform.And then according to their needs to complete the corresponding experiment contents.You can achieve resource sharing without purchasing or installing the appropriate hardware and software,which greatly saves the experiment resources.The remote experiment platform designed in this paper can be used in the theory and practice teaching of communication circuit,which not only broke the time limit of classroom and experiment space,but also explored the development and application of remote experiment to encourage students to carry out autonomous learning.The test results of the functional modules of the experimental platform show that the system has a friendly human-computer interface,easy to use,stable performance and the expected design goals are achieved.