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1、-Unit 1 E*ercises(1) Translate the following sentences into Chinese.1. As with series resonance, the greater the resistance in the circuit the lower the Q and, accordingly, the flatter and broader the resonance curve of either line current or circuit impedance.对于串联谐振，电路中的电阻愈大Q值就愈低，相应地线路电流或电路阻抗的谐振曲线也
2、就愈平、愈宽。2. A wire carrying a current looks e*actly the same and weighs e*actly the same as it does when it is not carrying a current.一根带电的导线其外表与重量都与不带电导线完全一样。3. Click mouse on the waveform and drag it to change the pulse repetition rate, or directly enter a new value of the period in the provided dia
3、logue bo*, while keeping the pulse width unchanged.在波形上点击鼠标并拖动来改变脉冲重复频率，或者在提供的对话框中直接输入新的周期值，而保持脉冲宽度不变。 4. Electronics is the science and the technology of the passage of charged particles in a gas, in a vacuum, or in a semiconductor. Please note that particle motion confined within a metal only is n
4、ot considered electronics.电子学是一门有关带电粒子在气体、真空或半导体中运动的科学技术。注意，在本书中粒子运动仅限于金属的情况不属于电子学。5. Hardware technologies have played vital roles in our ability to use electronic properties to process information, but software and data processing aspects have not developed at the same speed.硬件技术在我们使用电子特性来处理信息的能力中
5、一直起着重要作用，而软件及数字处理方面却没能与硬件同步开展。6. However, in a properly designed DC amplifier the effect of transistor parameter variation, other than Ico, may be practically eliminated if the operation point of each stage is adjusted so that it remains in the linear operation range of the transistor as temperature
6、 varies.然而在设计得当的直流放大器中，假设调节每一级的工作点使之在温度变化时保持在晶体管线性区，就能在实际上消除Ico以外的晶体管参数变化所造成的影响。(2) Fill in the blanks with the most appropriate choice.1. A message signal can any amplitude value between 0 and A volts.A. assumeB. useC. receiveD. accept2. Each time a positive clock edge occurs, the flip-flop changes
7、 state, leading to half as many pulses at the output to the clock input.A. asB. paredC. dueD. so as3. In the previous section we discussed sine-wave or CW modulation systems in which the modulating signal _ of a digital pulse train.A. madeB. consistedC. containedD. got4. In this book we shall emphas
8、ize the limitations imposed on the information transmitted by the system through which it was _ and shall attempt some parison of different systems.A. putB. traveledC. passedD. viewed5. This signal either does not change, or it changes _ by an amount equivalent to one or more quantum steps.A. interr
9、uptedlyB. rudelyC. abruptlyD. absolutely6. We shall only be _ with logical representations, not absolute valuesA. interestedB. caringC. referredD. concerned(3) Choose the phrase that is closest in meaning to the underlined part.1. It is all too easy with linear circuits, which appear relatively simp
10、le when pared with todays ple* logic arrangements, to ignore detailed performance parameters which can drastically reduce the e*pected performance.A. which has bad influence upon the system performance B. which is important to ensure circuit linearityC. which is possible to enhance the system perfor
11、manceD. which is crucial for maintaining the desired performance2. Therefore there will be a slight time delay, due to the propagation delay of the flip-flops between the time one flip-flop changes state and the time the ne*t one changes state, i.e., the change of state ripples through the counter,
12、and these counters are therefore called ripple counters.A. the state change is propagated through the counter like ripplesB. the state changes cause ripples in the counterC. passing through the counter, the state ripple changesD. the state of the counter changes due to ripples3. Instead of triggerin
13、g on each pulse, a phase lock technique e*amines the relative phase between each oscillator and many of its sync pulses and adjusts oscillator frequency so that the average phase discrepancy is small.A. checks each oscillator for many sync pulsesB. checks the phase relationship between individual os
14、cillators and a collection of sync pulsesC. looks at the relations between the phase and the sync pulsesD. e*amines whether the phase is relative to the oscillator and the sync pulses4. By keeping the off state slightly below threshold, the delay between the applied electrical pulse and the resultin
15、g optical output pulse is minimized; this delay must indeed not be more than the bit interval so that the optical pulse can accurately reproduce the input signal.A. ensuring that the system is off the threshold by a small marginB. maintaining the systems shut-down state somewhat below a prescribed l
16、evelC. making sure the system is below its threshold so that the state is kept off D. keeping the system in a shut-down state that is under a given level with a tiny tolerance5. If the original signal is well behaved, the local oscillator will need very little information to be able to track, and that information can be obtained by averaging for a long peri
