Abstract:Accompany with the technical development of integrated circuit( IC), the electronics design automation( EDA) becomes the important design means gradually, already extensive applied in imitate to wait many realms with numerical electric circuit system.The electronics design automation is a kind of technique that carries out the electronics system or the electronics products to automate the design, it with the electronics technique, the technical development of micro-electronics is closely related, it absorbed latest research result of the calculator science realm, being the work terrace with the calculator of the high performance, promoting engineering develop.EDA an important characteristic is to use the hardware description language( HDL) to come to finished design document, language of VHDL is through the standard hardware language that the IEEE confirm, designed the realm to be subjected to accept extensively in the electronics.This text first overview technical development general situation of EDA, the FPGA/ CPLD development process, and the development step of the VHDL language;Then introduced the basic electricity quantity of charged barbed wire net, include the frequency, power factor, mutually a general theory for measure;Emphasized to introduce to complete the frequency, power factor with the language of VHDL, mutually the design work of;Introduced the design and the system developments of the outer circle hardware electric circuit finally in of what time realize.