Pass Transistor Logic. The loss in electrical performance is especially disconcerting when the pass block functionality is provided by an nmos transistor instead of a cmos transmission gate see this article for more information. Pass transistor logic ptl also known as transmission gate logic is based on the use of mosfets as switches rather than as inverters.
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The loss in electrical performance is especially disconcerting when the pass block functionality is provided by an nmos transistor instead of a cmos transmission gate see this article for more information. Pass transistors require lower switching energy to charge up a node due to the reduces voltage swing. Pass transistor logic working is given below.
Pass transistor logic ptl also known as transmission gate logic is based on the use of mosfets as switches rather than as inverters.
The bottom line with pass transistor logic is that you are trading electrical performance for the possibility of reducing transistor count. Pass transistor logic can result in simple small area circuits but is limited to special applications and requires the use of complementary inverters to restore signal levels especially when the switches are simple nmos transistors. The pass transistor logic is required to reduce the transistors for implementing logic by using the primary inputs to drive gate terminals source and drain terminals. The result is in some cases conceptual simplification but the cmos inverter s strict logic high logic low output characteristic is lost.
