The signal is processed by simulated filter and digital filter.

Application of Mulitsim7 in active filter circuit amplitude-frequency characteristic test;

For solving the problem,the input filter circuit and output filter circuit of DC/DC conversion module are designed firstly.

The sine signal is gained from the rectangle wave,which is filtered by three order lowpass filter circuit.

This paper analysed the antenna tuner and the filtering circuit of the PDM pure solid-state transmitter,and analysed the feasibility of the two possible conditions (lightning and adjacent frequency interfe-(rence)) of the antenna matching network,works out the antenna s normalized impedance,makes the actual measurement of the matching network through the true exam.

This article introduced the design of pulse testing for experimental teaching, including the design of pulse signal amplifying and filtering circuit and the recording arterial pulse wave by depicting ECG.

The Study on Parallel Evolving Method of Evolvable Analog Filter;

The analog filter is the important unit of modern measurement and control system, but the traditional method has a very tedious design process.

It is necessary that the parameter of digital filter is transformed to the parameter of analog filter based on the indicated method (for example, the method of double linear transform or the method of non-changing impulse response etc.

Research on the fault diagnosis technology of analogue circuits;

Novel method for analogue circuit fault diagnosis based on clustering binary tree SVMs;

In this paper,we analysed the problem of the analogue electric control system which was adopted in the shaft hoist in Zhangji coal mine,and put forward the scheme of technical reconstruction by using the digital analogue circuit system.