1. Chapter 13 Signal Generators and Waveform- Shaping Circuits
13.4 Bistable multivibrators
13.5 Generation of square and triangular waveforms using astable multivibrators
13.6 Generation of a standardized pulse – The monostable multivibrator
13.7 Integrated – circuit timers

3. The oscillator feeback loop

4. The oscillation criterion

5. 13.4.1 The Feedback Loop . Fig.13.17 A positive – feedback loop capable of bistable operation

8. 13. 4. 2 Transfer Characteristics of the Bistable Circuit. Fig. 13
Transfer Characteristics of the Bistable Circuit . Fig (a) The bistable circuit of Fig with the negative input terminal of the op amp disconnected from ground and connected to an input signal vI ; (b) The transfer characteristic of (a) for increasing vI ; (c) The transfer characteristic for decreasing vI and (d) The complete transfer characteristics

16. A Bistable Circuit with Noninverting Transfer Charactewristics . Fig (a) A bistable circuit derived from the positive – feedback loop of Fig by applying vI through RI . (b) The trasnfer characteristic of the circuit in (a) is noninverting

17. 13-4-5 A bistable circuit with noninverting transfer characteristics

19. 13. 4. 6 Application of the Bistable Circuit as a Comparator. Fig. 13
Application of the Bistable Circuit as a Comparator . Fig (a) Block diagram representation and transfer characteristic for comparator having a reference , or threshold, voltage vR . (b) Comparator characteristic with hysteresis .

24. 13-5 Generation of square and triangular waveforms using astable multivibrators

25. Fig (a) Connecting a bistable multivibrator with inverting transfer characteristics in a feedback loop with an RC circuit

26. Fig (continued) (b) the circcuit obtained when the bistable multivibrator is implemented with the circuit in Fig (a) . (c) Waveforms at various nodes of the circuit in (b) . This circuit is called an astable multivibrator .

32. 13. 7 Integrated Circuit Timers. Fig. 13
13.7 Integrated Circuit Timers . Fig A block diagram representation of the internal circuit of the 555 integrated- circuit timer .

34. 13. 7. 2 Implementing a Monostable Multivibrator Using the 555 IC. Fig
Implementing a Monostable Multivibrator Using the 555 IC . Fig (a) The 555 timer connected to implement a monostable multivibrator . (b) Waveforms of the circuit in

40. 13. 7. 3 An astable multivibrator using the 555 IC. Fig. 13
An astable multivibrator using the 555 IC . Fig (A) The 555 timer connected to implement an astable multivibrator . (b) Waveforms of the circuit in (a) .