【正文】 observation of the waveform signal. Maximize the use of PLD system can streamline the logic of the ponents, so that the number of simplifying the circuit design to achieve the best. (3) High signal integrity analysis system (Advanced Integrity 99): signal integrity analysis system provides an accurate signal integrity simulator that can be used to analyze the PCB design, circuit design parameters to check the experimental overshoot, impedance and signal harmonic requirements. Second, Protel 99 The functional properties 1, openended design of integrated management system 2, superfunction, modify and edit function 33a powerful design automation.。 simulation and PLD in part (1) Circuit Simulation System (Advanced SIM 99): circuit simulation system includes a digital / analog signal simulator that provides a continuous digital signal and analog signals in order to signal to the circuit schematic simulation, in order to verify the correctness and feasibility. (2) programmable logic design system (Advanced PLD 99): programmable logic design system that contains a grammatical function in a text editor and a waveform editor (Waveform). The primary function of the system is。 update and modify the package ponents。 update and modify the circuit parts library。 users can work in accordance with the circuit judge and sizeband, choose to use.Protel99Protel99 is Windows9X/2000/NT operating system used in the EDA design software, design database management model that can be network design, has a strong capacity and open data exchange and 3D simulation capabilities, is a 32bit design software , to be pleted schematic circuit design, printed circuit board design and the design of programmable logic devices, etc., can be designed 32 signal layers, power supply 16 and 16 stratigraphic layer machining. first. Protel 99 ponents of the system divided in accordance with the system, Protel99 most of the major include the following two and six function modules. s Matlab simulation etc. HS (CoSimulation), bined with the application of the model ponents rich Library and measurement / verification between devices connection functions, will be able to increase the circuit and system design of the convenience, speed and accuracy. ADS software versions of ADS2008, ADS2006A, ADS2005A, ADS2004A, ADS2003C, ADS2003A, ADS2002C and ADS2002A and so on . 2). ADS software simulation analysis HighFrequency SPICE analysis and deconvolution analysis (Convolution) The provision of highfrequency analysis methods such as SPICE simulator SPICElike transient analysis of linear and nonlinear circuit analysis of the transient effect. In the SPICE simulator can not directly use the frequency domain analysis model, such as microstrip lines such as stripline, can be highfrequency SPICE simulators directly because when in the simulation of high frequency SPICE simulators in the frequency domain Analysis of pulltype model for transient analysis, after transformation, without the need for users of the model into the equivalent RLC circuit. Therefore can be done in addition to highfrequency lowfrequency SPICE transient circuit analysis, highfrequency circuits can be analyzed the transient response. In addition highfrequency SPICE also provides the function of transient noise analysis, circuit simulation can be used to the transient noise, such as oscillators or phaselocked loop jitter. Convolution analysis method for the structure of highfrequency SPICE simulators in the senior timedomain analysis methods, analysis by convolution with a more accurate method of timedomain analysis in the frequencydependent ponents, such as the definition of S parameters of the ponents, transmission lines , microstrip lines. Linear Analysis Linear analysis of frequencydomain circuit simulation analysis method can be linear or nonlinear RF and microwave circuit to do the linear analysis. When linear analysis, the software will first circuit for calculation of each ponent required for the linear parameters, such as S, Z, Y and H parameters, circuit impedance, noise, reflection coefficient, stability coefficients, gain or loss, etc. ( If the calculation of its nonlinear ponents of the linear operating point parameters), in the entire circuit analysis, simulation. Harmonic balance analysis (Harmonic Balance) Harmonic balance analysis of the frequency domain, steady, largesignal simulation of the circuit analysis methods, can be used to analyze the input signal with a multifrequency nonlinear circuit, the circuit to be nonlinear response, such as noise, power pression point, harmonic wave distortion. With the timedomain analysis of SPICE simulation, pared to harmonic balance circuit for the nonlinear analysis, can provide a more rapid and efficient analysis methods. Harmonic balance analysis of the emergence of fill SPICE transient response analysis and linear analysis of S parameters with multifrequency input signals on the nonlinear circuit simulation deficiencies. Especially in today39。 ADS support for RF and system design engineers developing all types of RF design, from simple to plex, from discrete RF / microwave modules for the munications and aerospace / defense integration of MMIC, is the domestic Most universities and research institutions in the use of the microwave / RF circuit simulation software and munications systems software. In addition Agilent semiconductor panies and manufacturers to build more than ADS Design Kit and Design Model File for the use. Users can use the Design Kit and simulation software for munication system design, planning and assessment, and MMIC / RFIC, analog and digital circuit design. In addition to the above simulation design features, ADSaided design software also provides features such as Design Guide is an example and model orders of the circu