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The collector to the base bias configuration of a common emitter transistor implicitly employs:
voltage series positive feedback
current series negative feedback
voltage shunt negative feedback
current shunt negative feedback
voltage shunt negative feedback
The collector-to-base bias configuration utilizes a feedback resistor connected from the collector output to the base input, providing negative feedback. Because the feedback signal is derived from the output voltage and is applied in shunt (parallel) with the input base-emitter junction, it is classified as voltage shunt negative feedback.
The collector-to-base bias configuration utilizes a feedback resistor connected from the collector output to the base input, providing negative feedback. Because the feedback signal is derived from the output voltage and is applied in shunt (parallel) with the input base-emitter junction, it is classified as voltage shunt negative feedback.
VBEтАЛ=VCтАЛтИТIBтАЛRBтАЛ
VCтАЛ=VCCтАЛтИТ(ICтАЛ+IBтАЛ)RCтАЛ
IBтАЛ=RBтАЛ+╬▓RCтАЛVCCтАЛтИТVBEтАЛтАЛ
In this configuration, if the collector current increases due to temperature, the collector voltage VCтАЛ drops. Since the base resistor RBтАЛ is connected to VCтАЛ, this reduction in voltage decreases the base current IBтАЛ. The reduction in IBтАЛ counteracts the initial increase in collector current, thereby stabilizing the operating point (Q-point).
Voltage shunt feedback stabilizes the output voltage against variations in transistor parameters.
The circuit is sensitive to changes in ╬▓ but provides better stability than simple fixed-bias circuits.
The feedback loop returns a portion of the output voltage to the input, reducing the overall voltage gain.
It is frequently used in common-emitter amplifiers to improve stability.
Simple circuit construction using only one additional resistor.
Provides a degree of negative feedback for improved stability over fixed bias.
Introduces input impedance reduction due to the shunt connection.
The feedback resistor reduces the overall voltage gain of the amplifier.
Small signal BJT amplifier stages.
Basic stabilization in low-cost transistor circuits.
Negative feedback is essential for amplifier stability in electronics.
Option A is incorrect as positive feedback leads to oscillation, not bias stability.
Option B (Current series) is typical of emitter-resistor stabilized bias.
Option D (Current shunt) is less common in standard BJT biasing configurations.
C is correct тАФ The collector-to-base bias circuit uses a feedback path from the collector to the base, forming a voltage shunt negative feedback loop.
Always remember: 'Voltage' feedback samples output voltage (parallel), while 'Current' feedback samples output current (series). If the feedback is connected in parallel with the input, it is 'Shunt'; if in series, it is 'Series'.
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