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CMOS logic families are associated with:
- Low power dissipation
- High noise immunity
- Low Fan-out
- Comparatively high logic voltage swing
- a)1, 2 and 4 only
- b)1, 2 and 3 only
- c)2, 3 and 4 only
- d)1, 2, 3 and 4
Correct answer is option 'A'. Can you explain this answer?
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CMOS logic families are associated with: Low power dissipation High no...
Complementary Metal-oxide-semiconductor (CMOS) uses complementary & symmetrical pair of P-type & N-type MOSFETS.
- The two important characteristics of CMOS devices are high noise immunity and low power dissipation.
- In CMOS, during static operation at a time, only one MOS is ON i.e. either PMOS or NMOS. So there is no direct path from the power supply to the ground. Hence, Power dissipation in CMOS is low in static operation but it has high power dissipation in dynamic operation.
- Fanout of CMOS is high.
- The gate has an almost ideal voltage-transfer characteristic. The logic swing is equal to the supply voltage and is not a function of the transistor sizes. The noise margins of asymmetrical inverter (where PMOS and NMOS transistors have equal current driving strength) approach VDD/2. The steady-state response is not affected by fanout.
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CMOS logic families are associated with: Low power dissipation High no...
Overview of CMOS Logic Families
CMOS (Complementary Metal-Oxide-Semiconductor) logic families are widely used in digital circuits due to their advantageous characteristics. The question evaluates four specific attributes associated with CMOS technology.
1. Low Power Dissipation
- CMOS circuits consume power primarily during switching.
- In static state (no switching), they draw negligible power, making them ideal for battery-operated devices.
2. High Noise Immunity
- CMOS logic offers robust noise margins.
- This means it can tolerate variations in voltage levels without affecting functionality, enhancing reliability in noisy environments.
3. Low Fan-out
- Fan-out refers to the number of inputs that a single output can drive.
- CMOS can indeed have lower fan-out compared to other logic families, particularly in older technologies. However, modern CMOS can drive multiple inputs effectively.
4. Comparatively High Logic Voltage Swing
- CMOS logic levels are clearly defined, typically resulting in higher voltage swings compared to other families like TTL (Transistor-Transistor Logic).
- This characteristic also contributes to better noise margins.
Conclusion
Given these attributes, the correct answer is "a) 1, 2, and 4 only."
- 1 (Low Power Dissipation): True
- 2 (High Noise Immunity): True
- 3 (Low Fan-out): While true, it is not as defining for modern CMOS.
- 4 (Comparatively High Logic Voltage Swing): True
Thus, options 1, 2, and 4 align with the strengths of CMOS logic families, confirming the answer choice.
CMOS (Complementary Metal-Oxide-Semiconductor) logic families are widely used in digital circuits due to their advantageous characteristics. The question evaluates four specific attributes associated with CMOS technology.
1. Low Power Dissipation
- CMOS circuits consume power primarily during switching.
- In static state (no switching), they draw negligible power, making them ideal for battery-operated devices.
2. High Noise Immunity
- CMOS logic offers robust noise margins.
- This means it can tolerate variations in voltage levels without affecting functionality, enhancing reliability in noisy environments.
3. Low Fan-out
- Fan-out refers to the number of inputs that a single output can drive.
- CMOS can indeed have lower fan-out compared to other logic families, particularly in older technologies. However, modern CMOS can drive multiple inputs effectively.
4. Comparatively High Logic Voltage Swing
- CMOS logic levels are clearly defined, typically resulting in higher voltage swings compared to other families like TTL (Transistor-Transistor Logic).
- This characteristic also contributes to better noise margins.
Conclusion
Given these attributes, the correct answer is "a) 1, 2, and 4 only."
- 1 (Low Power Dissipation): True
- 2 (High Noise Immunity): True
- 3 (Low Fan-out): While true, it is not as defining for modern CMOS.
- 4 (Comparatively High Logic Voltage Swing): True
Thus, options 1, 2, and 4 align with the strengths of CMOS logic families, confirming the answer choice.
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CMOS logic families are associated with: Low power dissipation High noise immunity Low Fan-out Comparatively high logic voltage swinga)1, 2 and 4 onlyb)1, 2 and 3 onlyc)2, 3 and 4 onlyd)1, 2, 3 and 4Correct answer is option 'A'. Can you explain this answer?
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