专业英语复习题-0519.doc

专业英语复习题一、Select and fill in the blank according to professional knowledge（Thebig topic5 items,each item3,total of15 points）. 根据专业知识选择填空（本大题共5个小题，每题3分，共15分）1、One of the summing constraints is_ either input terminal of the ideal operational amplifier.2、When negative feedback is applied around the ideal operational amplifier, _apporaches zero.3、The gain of _ with the feedback loop closed is unity gain. 4、Assume the output impedance of ideal op amp to be zero, then it can be supply _ to the load being driven. 5、When a zero signal appera between the invertin and non-inverting inputs, the amplifier output_.6、The input impedance of the ideal operational amplifier is asummed _. 7、The closed loop gain of _ can be any desired value above unity. 8、The output voltage polarity of _is opposite with the input voltage. 9、The frequency response of an ideal operational amplifier will be flat and _.10、No current flows into _ of the ideal op amp.1、the differential input voltage2、 no current flows into3、will be zero 4、the voltage following5、as much current as necessary6、inverting amplifier 7、to be infinite8、non_inverting amplifier9、either input terminal10、infinite bandwidth二、Grammatical function analysize for the underlined parts(Thebig topic5 items,each item3,total of15 points).二、进行划线部分的语法功能分析（本大题共5小题，每题3分，共15分）1、These two statements will be used repeatedly in the analysis of the fedback circuits to be presented in the rest of this section.2、Since no current flows at the non-inverting input, the input impedance of the voltage follower is infinite.3、Its utility is reflected in the variety of intuitive devices that are commonly used to simplity its analysis.4、Such circuits are widely used in control and instrumentation where non-inverting gain is required.5、the summing point, the inverting input, will conduct no current to the amplifier.6、The voltage appearing between the inverting and noninverting inputs approaches zero when the feedback loop is closed.7、The feedback resistor is of partical importance if the op amp selected is a current-feedback type.8、Unity gain circuit are used as electrical buffers to isolate circuit or devices from one another.9、The stability of current-feedback op amps is dependent entirely on the value of feeback resistor selected.10、Such circuits are widely used in control and instrumentation where non-inverting gain is required.三、Systax analysize and mark its function with following sysbols: Subject: _; Predicate:; Object:; Attribute：( ); Adverbial: (Thebig topic5 items,each item6,total of30 points).三、句法分析，并用下列符号表示：主语_；谓语：；宾语：；定语：（ ）；状语： 。1、Input impedance to this circuit is not infinite as in the two previous circuits, the inverting input is at ground potential so the driving source effectively “see” Ri as the input impedance.2、This property is to become an important tools for circuit analysis and design, for it gives us an inherent restraint on our circuita place begin analysis.3、In the case of the ideal operational amplifier, circuit analysis was simplified by the ideal summing point restraints of zero voltage and zero current at the inverting input.4、The stability of current-feedback op amps is dependent entirely on the value of feedback resistor selected, and the designer should use the value recommended on the data sheet for the device.5、When feedback is used around an operational amplifier, the closed loop gain of the circuit is determined by a ratio involving the input and feedback impedance used.6、The rest of the ideal circuits to be studied will give any (finite) closed loop gain desired while maintaining control through feedback.7、Another such device uses the action of a lever to show as vector of the voltage relations that exist using the inverting input as the fulcrum.8、Although it is userful and ease to treat the op amp as a black box with a perfect input/output characteristic, it is important to understand the inner working, so that one can deal with problems that will arise due to internal parasitic capacitance, etc.9、Input impedance to this circuit is not infinite as in the two previous circuits, the inverting input is at ground potential so the driving source effectively “see” Ri as the input impedance.10、As a voltage following power amplifier, this circuit will allow a source with low current capabilities to drive a heavy load.四、Translate from english into chinese ( Thebig topic1 items,total of40 points ).四、英译汉（1个大题，40分）16、At the register level, a digital system is viewed as a collection of elements called register that store information, interconnected in some fashion(方式) by signal lines. Information is processed by the system by transferring(移动) it between registers along these signal lines. In some cases the informations is transformed during these register transfers(寄存器传输) by routing it through one or more functional models. Figure 1(a) and (b) illustrate the system- and register-level modules of a digital system that computes the sum of a sequence of(系列) binary numbers, supplied one at a time as inputs to the system. At the system level, all that is known as the basic function of the system, which is to compute: Combinational and sequential logic circuits completely define the logical behavior of a digital system. Ultimately（最终）, each logic gate must be realized by a lower-level transistor circuit, which in turn（依次） is realized by combining various semiconductor and other materials. The technologies used to construct gates and other logic elements have evolved from（由进化） mechanical devices to relays to electron tub