The rejection time for inertial delays is required to be...

Name: Problem 7, Chapter 6: Logic and Computer Design Fundamentals
Uploaded: 2021-01-15T16:45:52-08:00
Duration: 5 min 6 s
Channel: Robin Corrigan
Description: The rejection time for inertial delays is required to be less than or equal to the propagation delay. In terms of the discussion of the example in Figure 6-6, why is this condition necessary to determine the delayed output?

The rejection time for inertial delays is required to be less than or equal to the propagation delay. In terms of the discussion of the example in Figure 6-6, why is this condition necessary to determine the delayed output?

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Key Concepts

Inertial Delay

Inertial delay is a model used in digital circuit simulation to represent real-world gate behavior by rejecting input pulses that are shorter than a certain duration. This ensures that only input changes which persist long enough (exceeding the rejection time) are allowed to propagate through the circuit, thereby filtering out transient glitches or noise that do not reflect true logical state changes.

Propagation Delay

Propagation delay refers to the time it takes for a signal change at the input of a gate or circuit element to arrive at the output. It represents the inherent delay due to the physical characteristics of the circuit components. In the context of inertial delay, the propagation delay determines the minimum duration an input pulse must have to be reliably transmitted to the output.

Rejection Time

Rejection time is the time threshold in inertial delay modeling that defines the minimum pulse width required for an input change to be considered significant enough to pass through the circuit. By requiring that the rejection time be less than or equal to the propagation delay, the circuit ensures that only pulses of sufficient length, and therefore likely to be intended changes rather than noise, are processed and affect the final output.

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