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What is the input and output resistance of common collector amplifier?
A common-collector (CC) amplifier typically has a high input impedance (typically in the hundred kΩ range) and a very low output impedance (on the order of 1Ω or 10Ω). This makes the common- collector amplifier excellent for “driving” small loads.
What is the input resistance for common collector configuration?
Dynamic input resistance is defined as the ratio of change in input voltage or base voltage (VBC) to the corresponding change in input current or base current (IB), with the output voltage or emitter voltage (VEC) kept at constant. The input resistance of common collector amplifier is high.
What is the input and output terminal in common collector configuration?
The common collector configuration has high input impedance and low output impedance. The input and output signals are in phase. Here also the emitter current is equal to the sum of collector current and the base current.
Which one of the following type of negative feedback increases the input resistance and decreases the output resistance?
Q:- The effect of current shunt feedback in an amplifier is to. Increase the input resistance and decrease the output resistance.
What is the output resistance of a common collector?
The output resistance of common collector amplifier is low. The current amplification factor is defined as the ratio of change in output current or emitter current IE to the change in input current or base current IB.
When to use the common collector amplifier as a buffer?
If R E is 1 kΩ, and β+1 is 200 Ω, one can easily calculate that R source +r ∏ can be neglected in the r input equation. With a small output resistance and a large input resistance, the common-collector amplifier is mostly used as a buffer.
How is base current and base collector voltage determined?
The input current or base current (IB) is taken along y-axis (vertical line) and the input voltage or base-collector voltage (VBC) is taken along x-axis (horizontal line). To determine the input characteristics, the output voltage VEC is kept constant at 3V and the input voltage VBC is increased from zero volts to different voltage levels.
What happens to a transistor in a common collector configuration?
In common collector configuration, if the input current or base current is zero then the output current or emitter current is also zero. As a result, no current flows through the transistor. So the transistor will be in the cutoff region. If the base current is slightly increased then the output current or emitter current also increases.