The Evolution Of Analog Active Filters

Since 1992,digital evolvable thinking which based on Genetic Algorithm was advanced.This achieved great success in the many field of application,and caused the concern of the scholars.Employment of this thought,and the fusion of Programmable logic Device and Genetic Algorithm produced a new schools of hardware,so it as,Evolvable Hardware.In the last few years,Analog circuits introduced this thought.The fusion of Programmablity Logic Array and Analog Circuits produced Analog Evolvable Hardware,it has been proved to be really effective.Filter which is one of the most basic unit of signal processor and measure instrument,has been penetrated every aspect of the technique of modern electronics.Now RC filter electric circuits have been made into a chip.But the finished product rate of the high precision Analog Filer are lower,because the deviations that the integrated circuit is produced are difficut to avoid of.Therefore we draw the thought of Evolvable Hardware into Analog active Filter design,and advance the Evolvable Analog Filter hardware structure.Then we engage in simulated experiment of programmable four ranks Active Analog Filter.According to the experiment and the characteristics of the EHW,we know that adoption Analog Evolvable Hardware can reduce production condition and condition costs.Moreover,the adoption Analog Evolvable Hardware can reduce the size of the device and cut down the consumption of power.In the future,Analog Evolvable Hardware will be commercially avialable,such as high precision Analog Filter and precision sensor.This will achieve great technology benefit, economy and social benefit. This paper describes an application of the EHW ideology to the Analog Active Filter design,and advances the Analog Evolvable Filter hardware structure.In order to find out the Active Analog Filter parameter,this paper proposes a new Genetic Algorithm.The results show that applying Genetic Algorithm designed the hardware structure of the Analog Evolvable Filter,which is satisfied with demands for specifications.This paper realizes the combination Genetic Algorithm theory with Active RC Filter theory.Under the Pspice environment,the simulated results show that the design of the Programmable four ranks Analog Active Filter is satisfied with specifications.