Question:
The non-inverting amplifier circuit behaves very similar to the voltage follower circuit except that
The non-inverting amplifier circuit behaves very similar to the voltage follower circuit except that
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Voltage follower:
\[
A_v=1
\]
Non-inverting amplifier:
\[
A_v=1+\frac{R_f}{R_1}
\]
A voltage follower is simply a non-inverting amplifier with \(R_f=0\) and \(R_1=\infty\).
Updated On: Jun 25, 2026
- Only a portion of output is fed back
- High input impedance
- Low output impedance
- Very little voltage drop across \(R_1\)
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The Correct Option is A
Solution and Explanation
Concept:
A voltage follower is a special case of a non-inverting amplifier.
Both circuits use negative feedback and possess very high input impedance and low output impedance.
Step 1: Recall the voltage follower configuration.
In a voltage follower, \[ A_v=1. \] The entire output voltage is fed directly back to the inverting terminal. \[ v_f=v_o. \] Thus, \[ v_o=v_i. \]
Step 2: Recall the non-inverting amplifier configuration.
For a non-inverting amplifier, \[ A_v=1+\frac{R_f}{R_1}. \] The feedback network consists of resistors. Only a fraction of the output voltage is fed back to the inverting terminal. \[ v_f=\beta v_o \] where \[ \beta<1. \]
Step 3: Compare both circuits.
Both circuits have
• High input impedance
• Low output impedance
• Negative feedback The key difference is that the voltage follower feeds back the entire output, whereas the non-inverting amplifier feeds back only a portion of the output. Therefore, \[ \boxed{\text{Only a portion of output is fed back}} \] is correct.
Step 1: Recall the voltage follower configuration.
In a voltage follower, \[ A_v=1. \] The entire output voltage is fed directly back to the inverting terminal. \[ v_f=v_o. \] Thus, \[ v_o=v_i. \]
Step 2: Recall the non-inverting amplifier configuration.
For a non-inverting amplifier, \[ A_v=1+\frac{R_f}{R_1}. \] The feedback network consists of resistors. Only a fraction of the output voltage is fed back to the inverting terminal. \[ v_f=\beta v_o \] where \[ \beta<1. \]
Step 3: Compare both circuits.
Both circuits have
• High input impedance
• Low output impedance
• Negative feedback The key difference is that the voltage follower feeds back the entire output, whereas the non-inverting amplifier feeds back only a portion of the output. Therefore, \[ \boxed{\text{Only a portion of output is fed back}} \] is correct.
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