![]() ![]() P-type and N-type semiconductor materials are used for the construction of diode and transistors. Apart from that, they are quite different in every other way.īefore going into the list of differences between diode and transistor, we are going to discuss their basics. Therefore voltage drop across Rc increase but voltage drop collects and emitter is zero, so output is zero.Įven giving high input at A out put is zero.What are the Key Differences Between Diode and Transistor?ĭiode and transistor are semiconductor-based electronic switches mostly used in every electronic device. ![]() ![]() When A is given +5 voltage Base current increases consequentially collector current increases in common emitter configuration. NOT gate is realised by transistor when A input is zero (grounded) so base is grounded.Īll the voltage drops across collector and emitter, so we will get high output. The potential difference across Rc due to forward biasing of emitter is just 5V equal and opposite to the potential difference across Rc due to battery in collector circuit. The value of Rb and Rc can be adjusted so that large Ic can flow. There will be emitter current, base current and collector current. (ii) When A = 1, the emitter base function gets forward biased. As the emitter current is zero, the base current is also zero and hence the collector current will also be zero. Now emitter base function is not forward biased but base-collector function is reverse biased. (i) When A = 0, the base of transistor also get earthed. The potential at C is equal to potential at D which is +5V with respect to earth. When A = 1, B = 1 none of diodes conduct and so no current flows through R. When A = 1, B = 0 for same reason, output is 0. Therefore a voltage drop of 5V takes place across R, having D at +5V and C at zero with respect to earth. Since D1 is ideal, no voltage drop occurs it. When A = 0, B = 1, D1 conducts diode D2 will not. Therefore potential difference of 5V takes place across R, with C at zero potential with respect to earth. The diodes being ideal, no voltage drop takes place across either diode. When A = 0 and B = 0 both diode D1 and D2 get forward biased and hence conduct. Hence the output Y will be 1 (in level).ġ. When A = 1 and B = 1, both diodes conducts since the diodes are ideal and connected in parallel, the voltage drop across R cannot exceed 5V, with C at +5V with respect to earth. ![]() For the same reason as stated above the output Y is 1 (in level).Ĥ. When A = 1 and B = 0, D1 conducts but D2 does not. Since D2 is ideal, no voltage drop takes place across D2 and a full voltage drop of 5V takes place across R at C, +5V with respect to earth. When A = 0 and B = 1 (i.e., connected to positive terminal), the diode D2 conducts but D1 does not. Therefore the voltage at C is zero with respect to earth. connected to low input 0), both the diodes do not conduct and no voltage develops across R. The symbol '.' or multiplication symbol is referred to as AND operation.ġ. The Boolean algebra '+' or addition symbol is referred to as OR operation. Truth table is a table that shows all possible input combination and the corresponding output combination for a logic gate. They are building blocks of any digital system. Under such condition the circuits are called logic gates. The circuits other wise called as gate allows the signal to pass only when some logical condition are satisfied. There are digital circuits which either allow a signal to pass through or stop it. ![]()
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