Which of the following is not true for a voltage follower amplifier?a)...
Voltage Follower Amplifier
A voltage follower amplifier is a type of operational amplifier circuit that has a high input impedance and low output impedance. It is also known as a unity gain amplifier or a buffer amplifier because its output voltage is equal to its input voltage and it has a gain of one.
Features of Voltage Follower Amplifier
The following are the features of a voltage follower amplifier:
Input voltage is equal to output voltage
In a voltage follower amplifier, the input voltage is equal to the output voltage. This means that the output voltage follows the input voltage exactly. Hence, it is called a voltage follower.
Input resistance is infinite and output resistance is zero
In an ideal voltage follower amplifier, the input resistance is infinite, which means that no current flows into the input terminal. The output resistance is zero, which means that it can drive any load without affecting the output voltage.
It has 100% negative feedback
A voltage follower amplifier has 100% negative feedback because the output voltage is fed back to the inverting input of the operational amplifier through a feedback resistor. This stabilizes the gain of the amplifier and reduces distortion.
Not true for a voltage follower amplifier
None of the mentioned is not true for a voltage follower amplifier. All the mentioned features are true for a voltage follower amplifier. It has a gain of one, infinite input resistance, zero output resistance, and 100% negative feedback. Hence, option D is incorrect.