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Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Videos > Digital Circuits > Propagation Delay, Setup, and Hold times

Propagation Delay, Setup, and Hold times Video Lecture | Digital Circuits - Electronics and Communication Engineering (ECE)

FAQs on Propagation Delay, Setup, and Hold times Video Lecture - Digital Circuits - Electronics and Communication Engineering (ECE)

1. What is propagation delay in digital circuits?

Ans. Propagation delay is the time it takes for a signal to travel from the input of a digital circuit to the output. It is a crucial parameter that affects the overall speed of the circuit and is influenced by factors such as the physical distance the signal must travel and the characteristics of the materials used in the circuit.

2. How do setup and hold times affect the performance of digital systems?

Ans. Setup time is the minimum time before the clock edge that the input data must be stable to be reliably sampled by a flip-flop. Hold time is the minimum time after the clock edge that the input data must remain stable. If these times are not met, it can lead to incorrect data being captured, thereby affecting the reliability and performance of the digital system.

3. What are the typical values for setup and hold times in modern integrated circuits?

Ans. Typical setup and hold times can vary significantly depending on the technology used. In modern integrated circuits, setup times may range from a few hundred picoseconds to a few nanoseconds, while hold times are generally shorter, often in the range of tens to hundreds of picoseconds. It's essential to refer to the specific datasheet for accurate values.

4. How can designers minimize propagation delay in a circuit?

Ans. Designers can minimize propagation delay by using shorter interconnects, selecting faster switching components, implementing pipelining techniques, and optimizing the circuit layout. Additionally, using buffer stages can help improve signal integrity and reduce delay.

5. What is the relationship between propagation delay, setup time, and clock frequency?

Ans. The relationship between these parameters is crucial for determining the maximum operating frequency of a digital circuit. The clock frequency must be set such that the sum of the propagation delay and the setup time is less than the clock period. If this condition is not met, it can lead to timing violations and unreliable operation of the circuit.

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Oct 23, 2025 Last updated

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Video Description: Propagation Delay, Setup, and Hold times for Electronics and Communication Engineering (ECE) 2025 is part of Digital Circuits preparation. The notes and questions for Propagation Delay, Setup, and Hold times have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about Propagation Delay, Setup, and Hold times covers all important topics for Electronics and Communication Engineering (ECE) 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Propagation Delay, Setup, and Hold times.

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Digital Circuits

76 videos|188 docs|70 tests

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