【正文】 reduction. Such as reducing a large RC work to a smaller RC work for faster simulation. This modeling method has known frequency limits for accuracy. B behavioral model Provides data on behavior at the input and output ports of a device. What the device consists of internally remains a black (opaque) box. Usually used when scanning a large design for the first time. At that point speed is desired over detail. behavioral modeling Systemlevel modeling consisting of a functional specification plus modeling of the timing of an implementation. A behavioral model consists of an HDL description of a device or ponent, which is expressed at a relatively high level of abstraction (higher than the registertransfer level or gate level). It uses underlying mathematical equations to represent the functional behavior of the ponent. See alsofunctional modeling. BEM Acronym for older Boundary Element Method. Method of numerical putational electromagics. Dates from before the 1980s. Requires ground plane. BER Acronym for Bit Error Rate. BGA Acronym for Ball Grid Array. BiCMOS Acronym for Bipolar Complementary Metal Oxide Semiconductor. BIRD Acronym for Buffer Issue Resolution Document – IBIS Committee. BJT Acronym for Bipolar Junction Transistor. BNC Acronym for Bayo Neill Concelman Connector. BOM Acronym for Bill Of Materials. BSIM Acronym for Berkeley Shortchannel IGFET Model. BTL Acronym for Backplane Transceiver Logic, as in 74BTL245. C C 1. Symbol for capacitance. 2. Abbreviation for degrees Celsius/Centigrade. CAD Acronym for Computer Aided Design. CAE Acronym for Computer Aided Engineering. CAM Acronym for Computer Aided Manufacturing. CB Acronym for Complementary Bipolar, as in 74CB245. CEM Acronym for Computational Electromagics. characterization model Another term for a device’s data sheet. Displays the behavior of various properties over current, frequency, temperature, population spread, etc. Characterize means to describe and depict. circuit Interconnection of ponents to provide an electrical path between two or more ponents. CISPR Acronym for Comit233。 leakage。 XAUI Si Abbreviation for Silicon. SI Acronym for Signal Integrity. SiGe Acronym for SiliconGermanium. sigma, s A standard deviation in a population distribution. A statistic used as a measure of the dispersion or variation in a distribution, equal to the square root of the arithmetic mean of the squares of the deviations from the arithmetic mean. Signal Integrity The technical discipline of maintaining the waveform integrity of a signal so that the digital logic can work properly. Actions include eliminating reflections, crosstalk, and noise on the signal. The 1’s and 0’s must be kept clean enough so that they are still recognized as 1’s and 0’s. simulation The process of verifying an electronic design using EDA software, which reads in models and input/output vectors, exercises the device under test. The software records the resulting electrical behavior and timing information for the purpose of identifying and debugging any incorrect or unexpected behavior. skin effect A physical effect on metallic conductors where, as frequency bees high enough, electric fields cannot perate into the conductor. All current then gets conducted on the outer surface (., skin) of the conductor. The thickness of the skin varies as 1/214。 enclosure resonances。cial des Perturbations Radioelectrotechnique. CMC Acronym for Compact Model Council. CML Acronym for Current Mode Logic. CMOS Acronym for Complimentary Metal Oxide Semiconductor. CMRR Acronym for Common Mode Rejection Ratio. Confidence interval A statistical range with a specified probability that a given parameter lies within the range. Confidence level Example: Suppose an opinion poll predicted that, if the election were held today, the Conservative party would win 60% of the vote. The pollster might attach a 95% confidence level to the interval 60% plus or minus 3%. That is, he thinks it very likely that the Conservative party would get between 57% and 63% of the total vote. Confidence limit Either of the two numbers that specify the endpoints of a confidence interval. correlation 1. How well a set of measurements agrees with a separate set of measurements on the same group of units. One or more attributes may be used. 2. Process of making a quantitative parison between two sets of data. Also, from the word roots co: together and relation. correlation metric A means of quantifying agreement between two sets of data. COTS Acronym for Commercial OffTheShelf apparatus. CPD Acronym for Cumulative Probability Distribution (function). crosstalk The amount of signal from one conductor that gets coupled onto an adjacent conductor through the mutual capacitance and inductance between them. The magnitude of the effect is always a fraction of the active, or aggressor, upon the passive, or victim, . The amount of coupling depends on the proximity of the s, the proximity of any ground/power plane, the length of any parallel runs, the risetime of the driving signal and the dielectric medium between them. current carrier A current carrier is either a conduction band electron or a conduction band hole. D DARPA Acronym for Defense Advanced Research Projects Agency. data sheet Documentation created after the properties and behavior of a population of devices, from a statistically incontrol process, are characterized. dB Acronym for decibel. The number of decibels denoting the ratio of the two amounts of power being ten times the logarithm to the base 10 of this ratio. With P1 and P2 designating two amounts of power and n the number of decibels denoting their ratio.(ANSI – 1992) N = 10log10 (P1/P2) dB dBmV/m Symbol for decibelsmicroVolts per meter. where dBmv = 20 log [Signal