EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 DIODE CLIPPING CIRCUITS 1. Pre-Lab Work 1) Using Protues, design

[answerhappygod]

Ee 4202 Electronic Circuits I Laboratory Experiment 2 Diode Clipping Circuits 1 Pre Lab Work 1 Using Protues Design 1 (130.76 KiB) Viewed 18 times

Ee 4202 Electronic Circuits I Laboratory Experiment 2 Diode Clipping Circuits 1 Pre Lab Work 1 Using Protues Design 2 (117.93 KiB) Viewed 18 times

Ee 4202 Electronic Circuits I Laboratory Experiment 2 Diode Clipping Circuits 1 Pre Lab Work 1 Using Protues Design 3 (108.23 KiB) Viewed 18 times

Ee 4202 Electronic Circuits I Laboratory Experiment 2 Diode Clipping Circuits 1 Pre Lab Work 1 Using Protues Design 4 (125.75 KiB) Viewed 18 times

Ee 4202 Electronic Circuits I Laboratory Experiment 2 Diode Clipping Circuits 1 Pre Lab Work 1 Using Protues Design 5 (123.2 KiB) Viewed 18 times

EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 DIODE CLIPPING CIRCUITS 1. Pre-Lab Work 1) Using Protues, design the simple diode clipping circuits to achieve the desired output waveforms below. Show these outputs in analog graph (See 'De 1/8 section). ... . 100%....................... .......... INPUT SIGNAL 0% .............. ..................... Title: CH1: 5V V/div CH2: V div Time div: 250us Circuit 1 Circuit 2 ♡ Л I Output 1 Output 2 ................ ................ ++++++ HAD A NV 10%................. ............... .... .............................. Title: Title CH1: 5V V/div CH2: V/div Time/div: 250us CH1: 5V V/div CH2 Vidiv Time div: 250us 1 EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 2. Description As you know, diodes can be used as switches depending on the biasing type, reverse or forward. The clipping circuit, also referred to as clipper, clips off some of the portions of the input signal and uses the clipped signal as the output signal. 本 中 以 Reversely turning off Forward turning-on Switch is closed Switch is opened Figure 1 2.1. Series Diode Clipping Circuit In these type of circuits, the diode is connected between the input and output voltage terminals (Figure 2) Vm 1 Ei Εο Ei Eo

Vm 3 51 Ei Εο Ei E Ει Εο EO EI Figure 2 As Figure 2 reveals, the negative cycle of the input voltage can be clipped off by this type of series clippers. Reversal of the diode pins results in a positive cycle clipping circuit as shown in Figure 3. 2. EE 4202 - ELECTRONIC CIRCUITS I LABORATORY 3/8 EXPERIMENT 2 Vm 31 Ei Eo Ei Εο Wr Εο Ei Ei Eo Figure 3 Previous circuits clip the values larger or smaller than zero voltage. This voltage, technically called "threshold voltage and can be changed to a desired value by inserting a D.C. voltage source. This is achieved in two different ways. In the first type, the voltage source of Em (positive or negative) is connected through output terminals as in Fig. 2.4. Depending on the diode connection (normal or reverse), the values smaller (Figure 4) or greater (Figure 5) than Em is clipped and assigned as Em. SR Ei Em Ei Eo w Em EO E Figure 4 BR Ei Em ៗ Ei Εο E Em Eo o Figure 5 Note that if Emis negative, (where the voltage source is reversely connected) again the values smaller or larger than this negative value is clipped, do not get confused.

In the second type of thresholded series clipping, the voltage source is applied between the input and output terminals, series with the diode. This time, the clipped values are assigned to zero and the net output voltage equals to the difference between the input and threshold values. (If Em is negative, then E = E-Em=E+ Eml) E ΕΙ Em EI Eo E-Em Eo o Figure 6 Em Ε. 0! OSCH E EI ŞRLE E+Vm Eo Figure 7 2.2. Parallel Diode Clipping Circuit In this type of clippers, the diode is connected between output terminals. The on/off state of diode directly affects the output voltage. These types of clippers may also have a non-zero threshold voltage by addition of a voltage series with diode. Following figures illustrate the clipping process. Em R Ei ☆ SR. E. TE Ei E. Figure 8 4 5/8 EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 Em E EI SRL Eo E Figure 9 Em R CA EI 7 Ei RL Eo E Εο Figure Em E Ε. Eo Eo -Ei Figure 11 3. Objectives • Understanding the operating principle of diode clipping circuit • Understanding the waveform change of diode clipping and clamping circuits when the bias is applied. 4. Experiment Equipment

4. Experiment Equipment • . KL-200 Linear Circuit Lab. Device Breadboard module Experiment Instruments: Oscilloscope, Function Generator 1N4148 Diode, 10K ohm resistor Cables for connections. . . 5 EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 5. Procedures 5.1. Series Diode Clipping Circuit 2) Build circuit shown in Figure 12. D1A4 DIK 1N4148 1N4148 Vi R1 10K Vo Vi R1 10k Vo Figure 12 Figure 123 3) Use function generator and produce a 20Vpp 1kHz Sine wave. Adjust oscilloscope voltage and time divisions until you have a clear view of the input signal. 4) Disconnect function generator output from oscilloscope and apply it to the circuit as V. 5) Measure the output signal from the second channel of oscilloscope as Vo. Record the plot on Graph 1. 6) Turn off all active devices, and reconfigure the circuit referring to Figure 13. 7) Measure the output signal and plot it on Graph 2. 100% 100% 110 10% ............. Title: Title CH1 CH2 Time div: V div V/div CH1: CH2 Time div V/div V/div Graph 1 Graph 1 6/8 6 EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 5.2. Thresholded Series Diode Clipping Circuit In this procedure, a threshold value is added to the previous circuit layout. 1) Turn off all active devices, and build circuit and connect voltage source +5 V DC by referring to Figure 14 D1 DINH DIKT 1N4148 1N4148 Vi R1 10K Vo Vi R1 10K Vo + V1 + V1 5V 5V

5.2. Thresholded Series Diode Clipping Circuit In this procedure, a threshold value is added to the previous circuit layout. 1) Turn off all active devices, and build circuit and connect voltage source +5 V DC by referring to Figure 14 Dist DIKA 1N4148 1N4148 Vi R1 10K Vo Vi R1 Vo 10k V1 + V1 5V Figure 144 Figure 14 2) Record the plot of output voltage on Graph 3. 3) Turn off all active devices and reconfigure circuit referring to Figure 15. 4) Plot output waveform on Graph 4. 100%...... 100%........... los vdiv Title Title CH1:. CH2: Time div: V/div CH1 CH2: Time diy: V/div V/div Graph 3 Graph 4 7 EE 4202 - ELECTRONIC CIRCUITS I LABORATORY EXPERIMENT 2 5.3. Parallel Diode Clipping Circuit 1) Build circuit refer to Figure 16. R1 R1 10K 10K Vi Vi Vo V D1 Vo 1N4148 D1 1N4148 Figure 16 Figure 17 2) Observe output voltage plot on Graph 5. 3) Turn off all active devices and rearrange the circuit by referring to Figure 17 4) Observe output voltage and plot on Graph 6 100%........ 100%........ 8/8 ++++ +++ HEHEHE 10 Title Title CH1 CH2 Time div V/div V div CH1 CH2: Time/div V/div V/div Graph 5 Graph 6