Question

Explain about pass transistor logic, what are the advantages and disadvantages of it?

Answer 1

Answer:

In electronics, pass transistor logic (PTL) describes several logic families used in the design of integrated circuits. It reduces the count of transistors used to make different logic gates, by eliminating redundant transistors. Transistors are used as switches to pass logic levels between nodes of a circuit, instead of as switches connected directly to supply voltages. This reduces the number of active devices, but has the disadvantage that the difference of the voltage between high and low logic levels decreases at each stage.

ADVANTAGES: The advantages of pass-transistor logic are the simple design, the reuse of already available signals, and the low contribution to static power. However, as against other types of logic, the x signals are not regenerated, instead, they are passed through an RC structure.

DISADVANTAGES: As integrated circuit supply voltages decrease, the disadvantages of pass transistor logic become more significant; the threshold voltage of transistors becomes large compared to the supply voltage, severely limiting the number of sequential stages.

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Answer 2

Pass transistor logic (PTL) are used in electronic system to make logic gates.

Explanation:

• Pass transistor logic (PTL) are used in electronic system to make logic gates.
• This transistor describes logic families that are used in the making of integrated circuits.
• It also reduces the number of transistors used to make different logic gates.

Advantage:

It is low cost transistor , Occupy less space and is simple.

Disadvantage:

Not capable of passing good logic 1 and 0