(8.1.8)--Chapter_11_OP-AmpApplications模拟电子技术基础.ppt

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1、Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsChapter 11 OP-Amp ApplicationsChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp Applications Outline Operation CircuitsSchmitt TriggerComparator Unit OperationChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Inverting Configuratio

2、n The inverting closed-loop configuration.Virtual ground.11.1 Operation CircuitsChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Inverting Configuration Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Inverting Configuration Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp

3、 ApplicationsThe Inverting Configuration Shunt-shunt negative feedbackClosed-loop gain depends entirely on passive components and is independent of the op amplifier.Engineer can make the closed-loop gain as accurate as he wants as long as the passive components are accurate.Chapter 11Chapter 11 OP-A

4、mp ApplicationsOP-Amp ApplicationsThe Noninverting Configuration The noninverting configuration.Series-shunt negative feedback.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Noninverting Configuration Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Voltage follower(a)T

5、he unity-gain buffer or follower amplifier.(b)Its equivalent circuit model.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Weighted SummerChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Weighted SummerChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsA Single O

6、p-Amp Difference AmplifierLinear amplifier.Theorem of linear Superposition.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsA Single Op-Amp Difference AmplifierApplication of superpositionInverting configurationChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsA Single Op-Amp Diff

7、erence AmplifierApplication of superposition.Noninverting configuration.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsIntegrators The inverting configuration with general impedances in the feedback and the feed-in paths.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe Inve

8、rting Integrators The Miller or inverting integrator.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsThe op-amp DifferentiatorChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp Applications11.2 Schmitt TriggerThe output signal only has two states:positive saturation(L+)and negative saturation

9、(L-).The circuit can remain in either state indefinitely and move to the other state only when appropriate triggered.A positive feedback loop capable of bistable operation.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsSchmitt Trigger The bistable circuit(positive feedback loop)The negat

10、ive input terminal of the op amp connected to an input signal vI.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsBistable CircuitThe transfer characteristic of the circuit in(a)for increasing vI.Positive saturation L+and negative saturation L-Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp

11、 ApplicationsBistable CircuitThe transfer characteristic for decreasing vI.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsBistable CircuitThe complete transfer characteristics.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsA Bistable Circuit with Noninverting Transfer Charact

12、eristicsChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsA Bistable Circuit with Noninverting Transfer CharacteristicsThe transfer characteristic is noninverting.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsComparator is an analog-circuit building block used in a variety appl

13、ications.To detect the level of an input signal relative to a preset threshold value.To design A/D converter.Include single threshold value and two threshold values.Hysteresis comparator can reject the interference.11.3 Comparator Unit Operation Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp Applica

14、tionsComparator Unit Operation Block diagram representation and transfer characteristic for a comparator having a reference,or threshold,voltage VR.Comparator characteristic with hysteresis.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsIllustrating the use of hysteresis in the comparato

15、r characteristics as a means of rejecting interference.Comparator Unit Operation Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsMaking the Output Level More PreciseFor this circuit L+=VZ1+VD and L=(VZ2+VD),where VD is the forward diode drop.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp

16、ApplicationsMaking the Output Level More PreciseFor this circuit L+=VZ+VD1+VD2 and L=(VZ+VD3+VD4).Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsGeneration of Square WaveformsConnecting a bistable multivibrator with inverting transfer characteristics in a feedback loop with an RC circuit

17、 results in a square-wave generator.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsGeneration of Square WaveformsThe circuit obtained when the bistable multivibrator is implemented with the positive feedback loop circuit.Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsWaveforms at various nodes of the circuit in(b).This circuit is called an astable multivibrator.Time period T=T1+T2Chapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsGeneration of Triangle WaveformsChapter 11Chapter 11 OP-Amp ApplicationsOP-Amp ApplicationsGeneration of Triangle Waveforms