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What is a good propagation delay?
Propagation delay, or delay, is a measure of the time required for a signal to propagate from one end of the circuit to the other. Network propagation delay is measured in nanoseconds (nS). Typical propagation delay for category 5e UTP is a bit less than 5 nS per meter (worst case allowed is 5.7 nS/m).
How do you calculate propagation delay in a circuit?
It can be computed as the ratio between the link length and the propagation speed over the specific medium. Propagation delay is equal to d / s where d is the distance and s is the wave propagation speed. In wireless communication, s=c, i.e. the speed of light.
What is propagation delay time?
Propagation delay is defined as the flight time of packets over the transmission link and is limited by the speed of light. For example, if the source and destination are in the same building at the distance of 200 m, the propagation delay will be ∼ 1 μsec.
What causes propagation delay in circuits?
Propagation delay typically refers to the rise time or fall time in logic gates. This is the time it takes for a logic gate to change its output state based on a change in the input state. It occurs due to inherent capacitance in the logic gate.
Which has the lowest propagation delay time?
The digital logic family which has the lowest propagation delay time is
| 1) | TTL |
|---|---|
| 2) | ECL |
| 3) | PMOS |
| 4) | CMOS |
| 5) | NULL |
Which logic family has highest propagation delay?
CMOS is the standard logic family used in most ICs except in specialized applications. Compared to TTL and its su-families, ECL is a much faster architecture and was widely used in computing architecture for some time. ECL offers propagation delay reaching ~1 ns, making it useful with GHz clock rates.
Which logic family has lowest propagation delay?
TTL
Among the given options, TTL has the least propagation delay.
Which family has highest switching speed?
Emitter-coupled-logic (ECL) is a BJT logic family that is generally considered the fastest logic available. ECL achieves its high-speed operation by employing a relatively small voltage swing and preventing the transistors from entering the saturation region.