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Binary-state

4040 CMOS 12級二進制計數、分頻器

The CD4020BC, CD4060BC are 14-stage ripple carrybinary counters, and the CD4040BC is a 12-sta

標簽： 4040 CMOS 二進制計分頻器

上傳時間： 2013-05-15

上傳用戶：ajaxmoon
高效的CABAC解碼器設計及FPGA實現

H.264/AVC是ITU與ISO/IEC(International Standard Organization/Intemational Electrotechnical Commission國際標準化組織/國際電工委員會)聯合推出的活動圖像編碼標準。作為最新的國際視頻編碼標準，H.264/AVC與MPEG-4、H.263等視頻編碼標準相比，性能有了很大提高，并已在流媒體、數字電視、電話會議、視頻存儲等諸多領域得到廣泛的應用。基于上下文的自適應二進制算術編碼(Conrext-based Adaptive Binary Arithmetic Coding，CABAC)是H.264/AVC的兩個熵編碼方案之一，相對于另一熵編碼方案-CAVLC(基于上下文的自適應可變長編碼)，CABAC具有更高的數據壓縮率：在同等編碼質量下要比CAVLC提高10％～15％的壓縮率。CABAC能實現很高的數據壓縮率，但這是以增加實現的復雜性為代價的。在已有的硬件實現方法上，CABAC的解碼效率并不高。論文在深入研究CABAC解碼算法及其實現流程，并在仔細分析了H.264/AVC碼流結構的基礎上，總結出了影響CABAC解碼效率的各個環節，并以此為出發點，對CABAC解碼所需中的各個功能模塊進行了優化設計，設計出一種新的CABAC解碼器結構，相對于一般的CABAC解碼器，它的解碼效率得到了顯著提高。論文針對影響CABAC解碼過程的"瓶頸"問題一多次訪問存儲部件影響解碼速率，提出了新的存儲組織方式，并根據CABAC的碼流結構特性，采用4個子解碼器級聯的方式來進一步提高解碼速率。最后，用Verilog語言對所設計的CABAC解碼器進行了描述，用EDA軟件對其進行了仿真，并在FPGA上驗證了其功能，結果顯示，該CABAC解碼器結構顯著提高了解碼效率，能夠滿足高檔次實時通訊的要求。

標簽： CABAC FPGA 解碼器

上傳時間： 2013-07-03

上傳用戶：huazi
74LS90.pdf

英文描述： DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER 中文描述：十年計數器;分頻12項反，4位二進制計數器

標簽： 74 LS 90

上傳時間： 2013-05-16

上傳用戶：zhouchang199
74LS244.pdf

英文描述： OCTAL BUFFER/LINE DRIVERS WITH 3-STATE OUTPUT(NONINVERTED) 中文描述：八路緩沖器/線路驅動器具有三態輸出（NONINVERTED）

標簽： 244 74 LS

上傳時間： 2013-04-24

上傳用戶：chengli008
精典的C算法300例子

·文件列表: 1998.C A24.C A25.C A26.C ADD_F.C ARF.C ARR.C BINARY.C BINARY1.C BODY.C C1.H C2.H C3.H C31.H &nbs

標簽： 300 算法

上傳時間： 2013-04-24

上傳用戶：a155166
COOLMOS全面認識

Recently a new technology for high voltage Power MOSFETshas been introduced – the CoolMOS™ . Based on thenew device concept of charge compensation the RDS(on) areaproduct for e.g. 600V transistors has been reduced by afactor of 5. The devices show no bipolar current contributionlike the well known tail current observed during the turn-offphase of IGBTs. CoolMOS™ virtually combines the lowswitching losses of a MOSFET with the on-state losses of anIGBT.

標簽： COOLMOS

上傳時間： 2013-11-14

上傳用戶：zhyiroy
DAC技術用語 (D/A Converters Defini

Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains constant) for eachincrease in the input code. the converse is true for decreasing codes.

標簽： Converters Defini DAC

上傳時間： 2013-10-30

上傳用戶：stvnash
開關電源EMI設計(英文版)

Integrated EMI/Thermal Design forSwitching Power SuppliesWei ZhangThesis submitted to the Faculty of theVirginia Polytechnic Institute and State Universityin partial fulfillment of the requirements for the degree of Integrated EMI/Thermal Design forSwitching Power SuppliesWei Zhang(ABSTRACT)This work presents the modeling and analysis of EMI and thermal performancefor switch power supply by using the CAD tools. The methodology and design guidelinesare developed.By using a boost PFC circuit as an example, an equivalent circuit model is builtfor EMI noise prediction and analysis. The parasitic elements of circuit layout andcomponents are extracted analytically or by using CAD tools. Based on the model, circuitlayout and magnetic component design are modified to minimize circuit EMI. EMI filtercan be designed at an early stage without prototype implementation.In the second part, thermal analyses are conducted for the circuit by using thesoftware Flotherm, which includes the mechanism of conduction, convection andradiation. Thermal models are built for the components. Thermal performance of thecircuit and the temperature profile of components are predicted. Improved thermalmanagement and winding arrangement are investigated to reduce temperature.In the third part, several circuit layouts and inductor design examples are checkedfrom both the EMI and thermal point of view. Insightful information is obtained.

標簽： EMI 開關電源英文

上傳時間： 2013-11-10

上傳用戶：1595690
DN442 I2C可控降壓緊湊型同步DC/DC穩壓器

The LTC®3562 quad output step-down regulator is designedfor multicore handheld microprocessor applications thatoperate from a single Li-Ion battery. Its four monolithic, higheffi ciency buck regulators support Intel’s mobile CPU P-Stateand C-State energy saving operating modes. The outputvoltages are independently controllable via I2C, and eachoutput can be independently started and shut down. Designerscan choose from power saving pulse-skipping mode orBurst Mode® operation, or select low noise LDO mode. Thespace-saving LTC3562 is available in a 3mm × 3mm QFNpackage and requires few external components.

標簽： DC 442 I2C DN

上傳時間： 2013-10-07

上傳用戶：1583060504
DN465 超低功耗升壓轉換器

Industrial remote monitoring systems and keep-alivecircuits spend most of their time in standby mode. Manyof these systems also depend on battery power, so powersupply effi ciency in standby state is very important tomaximize battery life. The LT®8410/-1 high effi ciencyboost converter is ideal for these systems, requiringonly 8.5μA of quiescent current in standby mode. Thedevice integrates high value (12.4M/0.4M) output feedbackresistors, signifi cantly reducing input current whenthe output is in regulation with no load. Other featuresinclude an integrated 40V switch and Schottky diode,output disconnect with current limit, built in soft-start,overvoltage protection and a wide input range, all in atiny 8-pin 2mm × 2mm DFN package.

標簽： 465 DN 超低功耗升壓轉換器

上傳時間： 2013-11-23

上傳用戶：新手無憂