1、Unit 10 Electronic Instruments & MeasurementsLesson 30 Logic Analyzers電子信息工程專業英語教程任治剛 主編電子工業出版社 Lesson 30 Logic AnalysersBackgroundsText tour Language in useVocabulary Structure Reading/writing techniquesTerminology Threshold門限，開端，極限Timing diagram時序圖Pulse width脈沖寬度，脈沖持續時間Backgrounds2022/8/5電子信息工程專業英

2、語教程4Terminology SUT: System Under Test被測系統Impedance阻抗Time base時基，掃描基線，掃描發生器Backgrounds2022/8/5電子信息工程專業英語教程5Terminology Data acquisition數據采集Propagation delay傳播延遲Mnemonics 助記符；速記法BackgroundsText tour Outline Capabilities and FeaturesArchitecture and OperationProbeSetup (Clock Mode and Triggering)Acqui

3、sition: Real-time Acquisition Memory analysis and Display 2022/8/5電子信息工程專業英語教程7Capabilities and FeaturesThe logic analyzer has different capabilities than the oscilloscope. the number of channels (inputs) Typical digital oscilloscopes have up to four signal inputs. Some complex system designs requir

4、e thousands of input channels. Appropriately-scaled logic analyzers are available for those tasks as well.2022/8/5電子信息工程專業英語教程8Capabilities and FeaturesA logic analyzer measures and analyzes signals differently than an oscilloscope. The logic analyzer doesnt measure analog details. Instead, it detec

5、ts logic threshold levels. A logic analyzers waveform timing display is similar to that of a timing diagram found in a data sheet or produced by a simulator. All of the signals are time-correlated, so that setup-and-hold time, pulse width, extraneous or missing data can be viewed. 2022/8/5電子信息工程專業英語

6、教程9Capabilities and FeaturesIn addition to their high channel count, logic analyzers offer important features that support digital design verification and debugging. Among these are:Sophisticated triggering that lets you specify the conditions under which the logic analyzer acquires data.High-densit

7、y probes and adapters that simplify connection to the system under test (SUT).Analysis capabilities that translate captured data into processor instructions and correlate it to source code.2022/8/5電子信息工程專業英語教程10Architecture and OperationFigure 10-7 Simplified logic analyzer block diagram2022/8/5電子信息

8、工程專業英語教程11Architecture and OperationProbeThe probes internal comparator is where the input voltage is compared against the threshold voltage (Vth), and where the decision about the signals logic state (1or 0) is made. The probe provides a high-quality signal path to the logic analyzer, minimizes ele

9、ctrical loading on the SUT and adapts to the various types of connections on circuit boards and devices .2022/8/5電子信息工程專業英語教程12Architecture and OperationProbeThe impedance of the logic analyzers probes (capacitance, resistance, and inductance) es part of the overall load on the circuit being tested.

10、 It is always critical to choose a probe with the lowest possible total capacitance.2022/8/5電子信息工程專業英語教程13Architecture and OperationSetup (Clock Mode and Triggering)Asynchronous acquisition captures signal timing information. In this mode, a clock internal to the logic analyzer is used to sample dat

11、a. The faster that data is sampled, the higher will be the resolution of the measurement. There is no fixed timing relationship between the target device and the data acquired by the logic analyzer. This acquisition mode is primarily used when the timing relationship between SUT signals is of primar

12、y importance.2022/8/5電子信息工程專業英語教程14Architecture and OperationSetup (Clock Mode and Triggering)Synchronous acquisition is used to acquire the “state” of the SUT. A signal from the SUT defines the sample point (when and how often data will be acquired). The signal used to clock the acquisition may be

13、the system clock, a control signal on the bus, or a signal that causes the SUT to change states. Data is sampled on the active edge and it represents the condition of the SUT when the logic signals are stable. The logic analyzer samples when, and only when, the chosen signals are valid.2022/8/5電子信息工

14、程專業英語教程15Architecture and OperationAcquisition: Real-time Acquisition Memory The logic analyzers probing, triggering, and clocking systems exist to deliver data to the real-time acquisition memory. This memory is the heart of the instrument the destination for all of the sampled data from the SUT, a

15、nd the source for all of the instruments analysis and display.2022/8/5電子信息工程專業英語教程16Architecture and OperationAcquisition: Real-time Acquisition Memory key factors in choosing a logic analyzerwidth depthsome tips to help determine channel count and memory depth:How many signals do you need to captur

16、e and analyze? How much “time” do you need to acquire? 2022/8/5電子信息工程專業英語教程17Architecture and Operationanalysis and Display The waveform display a multi-channel detailed view that lets you see the time relationship of all the captured signalsThe listing displayprovides state information in user-sele

17、ctable alphanumeric form.The source code debug displayAn additional displaycorrelating the source code to the instruction trace historyArchitecture and Operationanalysis and Display The waveform display is ideal for: Diagnosing timing problems in SUT hardwareVerifying correct hardware operation by c

18、omparing the recorded results with simulator output or data sheet timing diagramsMeasuring hardware timing-related characteristics: Race conditionsPropagation delaysAbsence or presence of pulsesAnalyzing glitchesVocabulary Threshold concern probe Base Impedance StructureReading/writing techniquesLan

19、guage in useVocabulary2022/8/5電子信息工程專業英語教程21Threshold in dictionaryA piece of wood or stone placed beneath a door; a doorsill.門檻An entrance or a doorway.入口，門口The place or point of beginning; the outset.起點；開端2022/8/5電子信息工程專業英語教程22Threshold in dictionaryA point separating conditions that will produce

20、a given effect from conditions of a higher or lower degree that will not produce the effect, as the intensity below which a stimulus is of sufficient strength to produce sensation or elicit a response:上限，下限，閥值2022/8/5電子信息工程專業英語教程23Threshold in dictionaryA point separating conditions that will produc

21、e a given effect from conditions of a higher or lower degree that will not produce the effect, as the intensity below which a stimulus is of sufficient strength to produce sensation or elicit a response:上限，下限，閥值2022/8/5電子信息工程專業英語教程24Threshold in textA logic analyzer measures and analyzes signals dif

22、ferently than an oscilloscope. The logic analyzer doesnt measure analog details. Instead, it detects logic threshold levels.邏輯分析儀測量、分析信號的方式也和示波器不一樣。邏輯分析儀并不測量信號的模擬細節，而是檢測信號的邏輯門限電平。 2022/8/5電子信息工程專業英語教程25Threshold in use interference threshold干擾門限operating threshold工作閾pulse improvement threshold脈沖信噪比改

23、善閾值quantizer threshold量化器門限2022/8/5電子信息工程專業英語教程26Threshold in use threshold of reaction反應極限threshold of sensitivity靈敏度界限2022/8/5電子信息工程專業英語教程27Concern in dictionaryTo have to do with or relate to:涉及,相關To be of interest or importance to:有關This problem concerns all of us.To engage the attention of; inv

24、olve:參與We concerned ourselves with plishing the task at hand.To cause anxiety or uneasiness in:使擔憂The firms weak financial posture is starting to concern its stockholders.2022/8/5電子信息工程專業英語教程28Concern in dictionaryA matter that relates to or affects one.利害Regard for or interest in someone or somethi

25、ng.考慮,關心A troubled or anxious state of mind arising from solicitude or interest.顧慮A business establishment or enterprise; a firm.公司或企業A contrivance; a gadget.器具2022/8/5電子信息工程專業英語教程29Concern in textWhen you connect a logic analyzer to a digital circuit, youre only concerned with the logic state of th

26、e signal. 當把邏輯分析儀連接到數字電路的時候，人們只關心信號的邏輯狀態。 2022/8/5電子信息工程專業英語教程30Concern in use Concerned adj.Interested and involved 有關的sent a memorandum to those concerned.Anxious; troubled 擔憂；焦慮的the concerned parents of youthful offenders.Concerning prep.關于,有關I spoke to him concerning his behavior. 2022/8/5電子信息工程

27、專業英語教程31Probe in dictionaryAn exploratory action, expedition, or device, especially one designed to investigate and obtain information on a remote or unknown region:探索A slender, flexible surgical instrument used to explore a wound or body cavity.探針2022/8/5電子信息工程專業英語教程32Probe in dictionaryThe act of

28、exploring or searching with or as if with a device or an instrument.探查，探測An investigation into unfamiliar matters or questionable activities; a penetrating inquiry:調查，查究2022/8/5電子信息工程專業英語教程33Probe in dictionaryTo explore with or as if with a probe:探測To delve into; investigate.調查；查究2022/8/5電子信息工程專業英語

29、教程34Probe in textThe probes are capable of acquiring high-quality signals, and have a minimal impact on the SUT. 探頭能夠采集高質量信號，而且對被測系統的影響最小。 2022/8/5電子信息工程專業英語教程35Probe in use active probe有源探測器capacitance-divider probe電容分壓探針comb probe梳狀測針deep-space probe太空探測器2022/8/5電子信息工程專業英語教程36Probe in use four poi

30、nt probe四點探針gamma-ray probe射線探頭grounded probe接地探頭Hall probe霍爾探頭2022/8/5電子信息工程專業英語教程37Base in dictionaryIn a numeration system, the number that is raised to the power denoted by the exponent and then multiplied the mantissa to determine the number represented. 底數A reference value.基準2022/8/5電子信息工程專業英語

31、教程38Base in dictionaryIn a numeration system, the number that is raised to the power denoted by the exponent and then multiplied the mantissa to determine the number represented. 底數A reference value.基準2022/8/5電子信息工程專業英語教程39Base in dictionaryIn a document copying machine, a sup- porting material for

32、an emulsion or other sensitizing agent.基片, 基底In a bipolar transistor, the control area or the electrical connection to the control area.基極2022/8/5電子信息工程專業英語教程40Base in text Logic analyzers are designed to capture data from multi-pin devices and buses. The term “capture rate” refers to how often the

33、inputs are sampled. It is the same function as the time base in an oscilloscope. “采集速率”這個詞是指輸入信號的采樣頻率。其功能和示波器中的時基電路是一樣的。 2022/8/5電子信息工程專業英語教程41Base in use base basis foundation ground groundworkThese nouns all pertain to what underlies and supports. Base is applied chiefly to material objects: Basis

34、 is used in a nonphysical sense Foundation applies physically (the foundation of a house)and figuratively (a statement without foundation in fact). It often stresses firmness of support for something of relative magnitude: 2022/8/5電子信息工程專業英語教程42Base in use base basis foundation ground groundworkThese nouns all pertain to what underlies and