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Buffer
A buffer is a logic circuit that amplifies the current or power. Basically it is used change the driving capability of a logical circuit. Therefore it is sometimes referred as drive. A simple buffer and tri state buffers (active high and active and low ) are shown in figure.
A tri state buffer if enabled provided the same logic level of the output as that of input i ,e if input is at logic 1 then it provides logic 1 output.
Q. Show that the block diagram of Figure can be reduced to the form of Figure. Find G eq (s) and H eq (s).
Input output The parallelogram symbol is used to represent the input output process as shown below. IN01H
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