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RFC choke is placed in Colpitts oscillator instead of resistor is to provide _________
- a)High impedance to DC
- b)High resistance to DC
- c)Low resistance to DC
- d)Less bulkiness
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
RFC choke is placed in Colpitts oscillator instead of resistor is to p...
RFC choke present in Colpitts oscillator is to provide high reactance to AC oscillation and low reactance to DC supply to improve performance. If resistor is used there will be some power loss in DC biasing which is unnecessary.
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RFC choke is placed in Colpitts oscillator instead of resistor is to p...
Explanation:
In a Colpitts oscillator, the choke is placed in parallel with the capacitor instead of a resistor. The purpose of this choke is to provide low resistance to DC.
Importance of DC resistance:
In an oscillator circuit, the choke is used to provide impedance to the DC component of the input voltage. The DC resistance of the choke is important because it determines the biasing conditions of the active device (usually a transistor) in the oscillator circuit.
Role of choke in Colpitts oscillator:
1. Impedance to DC: The choke provides a high impedance to the DC component of the input voltage. This prevents the DC component from flowing through the LC tank circuit, which consists of the inductor and capacitors.
2. Preventing biasing issues: The choke ensures that the DC biasing conditions of the active device are not affected by the DC component of the input voltage. This is important because any variation in the biasing conditions can affect the operating point of the active device and the stability of the oscillator.
3. Stabilizing the oscillator: The choke helps in stabilizing the oscillator by providing a stable DC biasing condition to the active device. This ensures that the oscillator operates at a consistent frequency and amplitude.
4. Reducing bulkiness: The use of a choke instead of a resistor in the Colpitts oscillator helps in reducing the overall bulkiness of the circuit. This is because a choke can provide higher impedance to DC with a smaller physical size compared to a resistor.
Therefore, the correct answer is option 'C' - the choke is placed in the Colpitts oscillator to provide low resistance to DC.
In a Colpitts oscillator, the choke is placed in parallel with the capacitor instead of a resistor. The purpose of this choke is to provide low resistance to DC.
Importance of DC resistance:
In an oscillator circuit, the choke is used to provide impedance to the DC component of the input voltage. The DC resistance of the choke is important because it determines the biasing conditions of the active device (usually a transistor) in the oscillator circuit.
Role of choke in Colpitts oscillator:
1. Impedance to DC: The choke provides a high impedance to the DC component of the input voltage. This prevents the DC component from flowing through the LC tank circuit, which consists of the inductor and capacitors.
2. Preventing biasing issues: The choke ensures that the DC biasing conditions of the active device are not affected by the DC component of the input voltage. This is important because any variation in the biasing conditions can affect the operating point of the active device and the stability of the oscillator.
3. Stabilizing the oscillator: The choke helps in stabilizing the oscillator by providing a stable DC biasing condition to the active device. This ensures that the oscillator operates at a consistent frequency and amplitude.
4. Reducing bulkiness: The use of a choke instead of a resistor in the Colpitts oscillator helps in reducing the overall bulkiness of the circuit. This is because a choke can provide higher impedance to DC with a smaller physical size compared to a resistor.
Therefore, the correct answer is option 'C' - the choke is placed in the Colpitts oscillator to provide low resistance to DC.
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