What Is Propagation Delay?

Propagation delay, symbol tpd, is the time required for a digital signal to travel from the input (s) of the logic gate to the output.

Propagation delay

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Propagation delay, symbol tpd, is the time required for a digital signal to travel from the input (s) of the logic gate to the output.

1) Propagation delay, the symbol t _pd , is the time required for a digital signal to travel from the input (s) of the logic gate to the output. The propagation delay time is usually measured in microseconds (s), nanoseconds (ns), or picoseconds (ps), where 1s = 10 ^-6 seconds, 1 ns = 10 ^-9 seconds, and 1 ps = 10 ^-12 seconds .

The propagation delay of an integrated circuit (IC) logic gate may vary for one input. If all other factors are set constant, the average propagation delay of a logic gate IC increases with the complexity of the internal circuit. Some integrated circuit technologies make interently longer tpd values higher than others, which is considered to be slower. In digital devices such as computers, propagation speed is important because it has a direct impact on speed. This applies to memory chips and microprocessors.

2) In a communication system, propagation delay refers to the time required for a signal to travel from source to destination. Here the delay time can vary from a satellite communication system's reach of about 0.25 seconds to several nanoseconds or microseconds of a local area network (LAN). ^[1]