Aim: To design OR and AND logic gates using diodes and resistors for a) positive logic (logic 1=5 V, logic 0=0V) b) negative logie (logic 1=-5 V, logic 0=0 V) Circuit Diagram D. D. Vour Vour D2 1 k Va 1 ka Positive logic OR gate Negative logic OR gate

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Expt.1 : Logic Gates Using Diodes
Aim: To design OR and AND logic gates using diodes and resistors for
a) positive logic (logic 1=5V, logic 0=0V)
b) negative logie (logic 1=-5V, logic 0 =0 V)
Circuit Diagram
Vour
Vour
1 ka
1 kn
Positive logic OR gate
Negative logic OR gate
Vaut
D.
1 kn
15V
Positive logic AND gate
1. The circuit diagram for the Positive logic OR gate, Negative logic OR gate and Positive logie
AND gate are shown in the figures. Test circuits with appropriate voltages of Vi and Va. Note
down your observations in the format shown in the table below.
VoUr
Y
(volts) (volts) (volts)
2. Design a Negative logic AND gate and test it in a similar way.
List/Explain the following
1. Typical voltage drop across the diodes (Silicon, Germanium, and Gallium Arsenide) for 10mA
of forward current.
2. Typical reverse saturation current in 1N4001 diode.
Transcribed Image Text:Expt.1 : Logic Gates Using Diodes Aim: To design OR and AND logic gates using diodes and resistors for a) positive logic (logic 1=5V, logic 0=0V) b) negative logie (logic 1=-5V, logic 0 =0 V) Circuit Diagram Vour Vour 1 ka 1 kn Positive logic OR gate Negative logic OR gate Vaut D. 1 kn 15V Positive logic AND gate 1. The circuit diagram for the Positive logic OR gate, Negative logic OR gate and Positive logie AND gate are shown in the figures. Test circuits with appropriate voltages of Vi and Va. Note down your observations in the format shown in the table below. VoUr Y (volts) (volts) (volts) 2. Design a Negative logic AND gate and test it in a similar way. List/Explain the following 1. Typical voltage drop across the diodes (Silicon, Germanium, and Gallium Arsenide) for 10mA of forward current. 2. Typical reverse saturation current in 1N4001 diode.
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