1、Unit 3 Electronic System Components,Lesson 9 Interconnects电子信息工程专业英语教程任治刚 主编电子工业出版社 ,2018/6/17,2,Lesson 9 Interconnects,BackgroundsText tour Language in useVocabulary Structure Reading/writing techniques,2018/6/17,3,Terminology VSWR frequency responsedecibelpad, lead ribbon cableBNC,Backgrounds,2018
2、/6/17,4,Terminology,2018/6/17,5,VSWR,Voltage Standing Wave Ratio 电压驻波比,2018/6/17,6,Frequency response,频率响应,2018/6/17,7,Decibel (dB),decibel 分贝A unit used to express relative difference in power or intensity, usually between two acoustic or electric signals, equal to ten times the common logarithm of
3、 the ratio of the two levels.,2018/6/17,8,Pad , lead,Pad 焊点，焊盘,Lead 引线,2018/6/17,9,ribbon cable,带状电缆扁平柔性电缆,2018/6/17,10,同轴电缆卡环形接头,BNC,2018/6/17,11,Text tour,Outline Introduction High-Speed Connector ProblemsCrosstalkLevels of Interconnects,2018/6/17,12,Interconnect devices are used for interconnecti
4、ng Performance requirements Tests that indicate signal integrity include ,Introduction,2018/6/17,13,Interconnect effects can play a significant part in the timing and noise characteristics of a circuit,High-Speed Connector Problems,2018/6/17,14,caused by inductive and capacitive coupling between con
5、tacts and/or lines feeding contacts. can be expressed in a percentage of the voltage swing of the signal, or in decibels (dB), Two types of crosstalk :backward crosstalk forward crosstalkCrosstalk can also be single-line or multiline. To completely understand the crosstalk specifications of a connec
6、tor, a user needs the following information:,Crosstalk,2018/6/17,15,Level 1: chip pad to package leads, e.g., wire bondsLevel 2: components to circuit board, e.g., PLCC socketLevel 3: circuit board (board-to-board) connector, e.g., edge-card for motherboard to daughter board connectionLevel 4: subas
7、sembly interconnects, e.g., ribbon cablesLevel 5: subassembly to I/O, e.g., BNC connectorLevel 6: system interconnects, e.g., Ethernet connectors,Levels of Interconnects,2018/6/17,16,Vocabulary loss, shield, detrimental, degradation, ratioStructureReading/writing techniques,Language in use,2018/6/17
8、,17,Vocabulary,2018/6/17,18,Loss in dictionary,The act or an instance of losing:失败One that is lost:损失The power decrease caused by resistance in a circuit, circuit element, or device.功率损耗The amount of a claim on an insurer by an insured.险损赔偿额,2018/6/17,19,Loss in text,Interconnect devices must meet c
9、ertain performance requirements in most or all of the following categories:Signal integrityPower loss互连器件必须满足下列大多数或者全部性能要求：信号完整性功率损耗,2018/6/17,20,Loss in use,absorption loss 吸收损耗antenna loss 天线损耗aperture loss 孔径失真conduction loss 传导损耗contact loss 接触损耗conversion loss 变换损耗coupling loss 耦合损耗crosstalk lo
10、ss 串话损耗,2018/6/17,21,Loss in use,2018/6/17,22,Shield in dictionary,A broad piece of armor made of rigid material and strapped to the arm or carried in the hand for protection against hurled or thrusted weapons. 盾A person or thing that provides protection. 后盾A protective device or structure 防护性装置或结构A
11、 technical safeguard that protects the circuit or unit from the influence of external electric or magnetic sources to produce harmful signal. 屏蔽,2018/6/17,23,Shield in text,Electrical characteristics: contact resistance, inductance and capacitance; voltage and power ratings; shielding; filtering 电气特
12、性（接触电阻，电感和电容，电压和功率额定值，屏蔽，滤波）,2018/6/17,24,Shield in use,arc shield 电弧罩baffle shield 隔音板cable shield 电缆套管electrostatic shield 静电屏蔽ground shield 接地屏蔽radiation shield 防辐射屏蔽,2018/6/17,25,Detrimental in dictionary,Causing damage or harm; injurious.引起损害的；有害的,2018/6/17,26,Detrimental in text,An interconnec
13、t that must pass the short rise time of a high-speed signal pulse can be detrimental to maintaining signal integrity due to an unwanted reflection. 因为出现了反射，所以在通过互连路径传送高速信号脉冲时，短促的上升时间就会破坏信号的完整性。,2018/6/17,27,Degradation in dictionary,The act or process of degrading.降级The state of being degraded; dege
14、neration.堕落，衰退A decline to a lower condition, quality, or level.退化，下降Decomposition of a compound by stages, exhibiting well-defined intermediate products.降解,2018/6/17,28,Degradation in dictionary,In data communications, a deterioration in the characteristics of a signal for whatever reason.A conditi
15、on in which the system operates at reduced levels of service. These circumstances are usually caused by unavailability of various equipment units or subsystems.,2018/6/17,29,Degradation in text,Signal integrity is defined by loss of quality of the input signal. Ideally, the signal at the output of a
16、n interconnect should be equal in all characteristics with the signal at the input of the interconnect. In reality, signal degradation occurs. 信号完整性是指输入信号质量的损失。理想情况下，互连器件的输出端信号和输入端信号在所有特性上都完全相同。实际中会发生信号质量的下降。,2018/6/17,30,Ratio in dictionary,Relation in degree or number between two similar things.比率
17、The relation between two quantities expressed as the quotient of one divided by the other:比例The ratio of 7 to 4 is written 7:4 or 7/4.,2018/6/17,31,Ratio in text,Tests that indicate signal integrity include:Voltage standing wave ratio (VSWR)Frequency responseRise-time of signal edgesCurrent flow能够反映
18、信号完整性的测试有：电压驻波比频率响应信号边沿的上升时间电流,2018/6/17,32,Ratio in use,abundance ratio 丰度amplification ratio 放大率aspect ratio 长宽比; 纵横比 availability ratio 可用率; 利用率; 资用率energy efficiency ratio 能量效率比faculty-student ratio 师生比limit ratio 限幅比power standing wave ratio 功率驻波比signal-noise ratio 信噪比,2018/6/17,33,Structure,2018/6/17,34,Reading / Writing techniques,
