9/27/2023 0 Comments Ttl transistor diagram and gate![]() When switch A is close (supplied with high level input signal) and B is open (supplied with low level input signal) i.e.When both switches A and B are open (switches are supplied with low level input signal) i.e.Let the two switches be A and B, then the we can explain the switching operation of AND gate as The AND gate switching circuit will have two inputs with two manually toggled switches. Explanation of AND gate with light switch circuit The truth table describes us that the output of AND gate will be LOW with all combinations of inputs except for both high inputs condition. The truth table for logical AND gate is given below. This means the AND gate produces the multiplication of its inputs. If the inputs of the AND gate is X, Y and the output is Z then the operation of AND gate is mathematically expressed in the Boolean expression as Z = X. The AND gate is logically represented as shown below with two inputs and one output. So again the output is measured as 0.īut when the two inputs (two diodes) are connected to a HIGH voltage level, then the two diodes are in forward biased condition (diodes switches are ON) so the output of the AND gate is HIGH, and measured as logic 1.ĪND gate Logic Symbol and Boolean expression If the two inputs are connected to LOW level input, then also the diodes will turn to reverse biased condition and allows no current. When one of the inputs of the AND gate is connected to logic HIGH and other is connected to logic LOW then the diodes are at reverse bias condition and no voltage drop at the output. In logic gates, the terms high voltage level means +5 V and low logic level means 0 V or ground. The circuit driving voltage V is applied to the parallely connected diodes and the output is collected as the voltage drop at the diodes. Commonly available TTL and CMOS logic AND gate IC’sĪND gate can be designed by using two simple diodes.Explanation of AND gate with light switch circuit. ![]()
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