Chapter 4 Common Diode Applications Clippers Clampers Voltage

Chapter 4 Common Diode Applications Clippers, Clampers, Voltage Multipliers, Displays, and Logic Circuits By jashvir chhikara 1

Objectives • State the purposes served by clippers, clampers, and voltage multipliers. • Describe the operation of series and shunt clippers. • Describe the effects of negative and positive clampers on an input waveform. • Describe the use of the LED in multisegment displays. • Study simple diode logic circuits. 2

Fig 4. 1 -11 Clipper (limiter) circuits. (1) Negative series clipper. 3

Fig 4. 1 -11 Clipper circuits. (2) Positive series clipper. 4

Fig 4. 1 -11 Clipper circuits. (3) Negative shunt clipper. 5

Fig 4. 1 -11 Clipper circuits. (4) Positive shunt clipper. 6

Fig 4. 1 -11 Clipper circuits. (5) Biased shunt clipper. 7

Fig 4. 1 -11 Clipper circuits. (6) Adjustable shunt clipper. 8

Fig 4. 12 -13 Clipper applications. (1) Transient-protection circuits 9

Fig 4. 12 -13 Clipper applications. (2) AM detector 10

Fig 4. 14 Clampers (DC restorers). 11

Fig 4. 15 Clamper operation. (1) Charge Discharge TC << TD 12

Example 4. 5 Determine the capacitor charge and discharge times for the circuit represented in Fig. 4. 15. Assume that the forward resistance of the diode (RD 1) is 10 W, RL = 10 k. W, and C 1 = 1 m. F. 13

Fig 4. 16 Clamper operation. (2) 14

Fig 4. 17 Clamper circuits. Negative clamper Positive clamper 15

Fig 4. 18 -19 Biased clampers. 16

Fig 4. 20 Voltage multipliers. (1) Half-wave voltage doublers. 17

Fig 4. 21 Voltage multipliers. (2) Operation of half-wave voltage doublers. 18

Fig 4. 23 Full-wave voltage doubler. 19

Cockcroft-Walton Circuit 20

Fig 4. 28 -29 Multisegment displays. 7 -segment display 16 -segment 5 x 7 dot matrix alphanumeric display 21

Diode Logic Circuits (1) V 1 0 V 0 V 5 V 5 V V 2 0 V 5 V Vo 0. 7 V 5 V AND function 22

Diode Logic Circuits (2) V 1 0 V 0 V 5 V 5 V V 2 0 V 5 V Vo 0 V 4. 3 V OR function 23

Summary • Clippers (limiters). • Clipper applications. • Clampers (dc restorers). • Voltage multipliers. • LED applications. • Diode logic circuits. 24