Important Digital Logic and Design Short Questions
Chapter: 7
Question 1:
What is the typical supply voltage for TTL-based devices?
Answer:
TTL-based devices typically operate with a +5 Volt dc supply.
Chapter: 7
Question 2:
Which TTL series is characterized by the fastest switching speed and lowest power requirements?
Answer:
The 74ALS Advanced Low-Power Schottky TTL series is characterized by the fastest switching speed and lowest power requirements.
Chapter: 7
Question 3:
What are the two categories of CMOS technology based on dc supply voltage?
Answer:
The two categories of CMOS technology based on dc supply voltage are +5 V CMOS and 3.3 V CMOS.
Chapter: 7
Question 4:
What is the input voltage range for a logic high signal in TTL logic?
Answer:
In TTL logic, the input voltage range for a logic high signal is from 2 to 5 volts.
Chapter: 7
Question 5:
How does CMOS technology compare to TTL in terms of power dissipation?
Answer:
CMOS technology has lower power dissipation compared to TTL technology.
Chapter: 7
Question 6:
What is the effect of noise on the operation of a CMOS AND gate?
Answer:
Noise can cause temporary drops in input voltage, leading to incorrect logic levels and possible malfunction of the CMOS AND gate.
Chapter: 7
Question 7:
Define Noise Margin in digital circuits.
Answer:
Noise Margin is a measure of a circuit's immunity to noise, calculated as the difference between valid output voltage and the minimum acceptable input voltage.
Chapter: 7
Question 8:
What is the propagation delay in digital circuits?
Answer:
Propagation delay is the time it takes for a signal to propagate through a logic gate, affecting the frequency at which the gate can operate.
Chapter: 7
Question 9:
How is power dissipation different between TTL and CMOS devices?
Answer:
TTL devices have constant power dissipation, while CMOS devices' power dissipation depends on the frequency of operation.
Chapter: 7
Question 10:
What does the Speed-Power Product (SPP) indicate about a logic circuit?
Answer:
The Speed-Power Product (SPP) indicates the performance of a logic circuit, considering both propagation delay and power dissipation. Lower SPP values signify better performance.