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Transistor turn off time is_______.
- a)Sum of storage and fall time
- b)Maximum value of storage time
- c)Maximum value of fall time
- d)Sum of rise and fall time
Correct answer is option 'A'. Can you explain this answer?
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Transistor turn off time is_______.a)Sum of storage and fall timeb)Ma...
Device turn off time= storage time + fall time.
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Circuit turn off time is always greater than device turn off time.
Becouse gate circuit require some time recovery purpose.
For proper circuit operation.otherwise it turn on any time.this is causes maloparation of circuit.
Circuit turn off time =device turn off time+gate recovery time.
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Transistor turn off time is_______.a)Sum of storage and fall timeb)Ma...
Transistor turn-off time refers to the time taken for the transistor to switch from an ON state to an OFF state. It is an important parameter in transistor switching applications as it affects the overall performance of the circuit. The turn-off time is influenced by various factors, such as storage time and fall time.
1. Storage Time:
- The storage time is the time taken for the transistor to switch off after the base current has been removed.
- During the storage time, the transistor is in a quasi-saturation state, and the collector current remains high.
- This delay is due to the presence of minority carriers stored in the base region of the transistor.
- The storage time is typically measured from the point where the base current falls to 10% of its peak value until the collector current reaches 90% of its peak value.
2. Fall Time:
- The fall time is the time taken for the transistor to transition from the ON state to the OFF state.
- It is the time required for the collector current to decrease from 90% to 10% of its peak value.
- The fall time is influenced by the time required for the minority carriers to be swept out of the base region.
- This time is dependent on the reverse bias applied to the base-collector junction.
3. Relationship between Turn-off Time, Storage Time, and Fall Time:
- The turn-off time of a transistor is the sum of the storage time and the fall time.
- This is because both the storage time and the fall time contribute to the overall delay in switching off the transistor.
- The storage time affects the initial delay, while the fall time affects the final part of the turn-off process.
- By summing these two times, we obtain the total turn-off time.
In conclusion, the turn-off time of a transistor is the sum of the storage time and the fall time. This parameter is crucial in transistor switching applications as it determines the speed and efficiency of the switching process. By understanding and optimizing these times, engineers can design circuits with faster and more reliable transistor switching characteristics.
1. Storage Time:
- The storage time is the time taken for the transistor to switch off after the base current has been removed.
- During the storage time, the transistor is in a quasi-saturation state, and the collector current remains high.
- This delay is due to the presence of minority carriers stored in the base region of the transistor.
- The storage time is typically measured from the point where the base current falls to 10% of its peak value until the collector current reaches 90% of its peak value.
2. Fall Time:
- The fall time is the time taken for the transistor to transition from the ON state to the OFF state.
- It is the time required for the collector current to decrease from 90% to 10% of its peak value.
- The fall time is influenced by the time required for the minority carriers to be swept out of the base region.
- This time is dependent on the reverse bias applied to the base-collector junction.
3. Relationship between Turn-off Time, Storage Time, and Fall Time:
- The turn-off time of a transistor is the sum of the storage time and the fall time.
- This is because both the storage time and the fall time contribute to the overall delay in switching off the transistor.
- The storage time affects the initial delay, while the fall time affects the final part of the turn-off process.
- By summing these two times, we obtain the total turn-off time.
In conclusion, the turn-off time of a transistor is the sum of the storage time and the fall time. This parameter is crucial in transistor switching applications as it determines the speed and efficiency of the switching process. By understanding and optimizing these times, engineers can design circuits with faster and more reliable transistor switching characteristics.
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Transistor turn off time is_______.a)Sum of storage and fall timeb)Maximum value of storage timec)Maximum value of fall timed)Sum of rise and fall timeCorrect answer is option 'A'. Can you explain this answer?
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