Question

In an inverting amplifier circuit, the output voltage is expressed as a function of
(A) input current
(B) output current
(C) source voltage
(D) source current

Answer 1

Hint: In the inverting amplifier circuit the amplifier is connected with the feedback from the output to the input to form the closed loop. In the inverting amplifier circuit, there is no current flow into the input terminals. The input voltages both are the same.

Complete step by step solution:
Amplifier is an electronic device which is used to increase the amplitude of the signals, amplifier is used in the sound system as well as the communication system. An amplifier circuit is generally used in the control of the electronic circuits. For every circuit the applied input signal is in the form of voltage or current. The use of amplifiers in the electronic circuit is to produce the output signal which is larger than the input signal. If the input signal is in the form of voltage, the main purpose of the amplifier is to produce the more voltage of the output signal, likewise if the input signal is in the form of the current, then the main purpose of the amplifier is to produce the more current of the output signal.



The inverting amplifier is the normal operational amplifier, in the inverting amplifier the output is given as the feed back to the input by means of the resistor, so it makes the closed loop. If the input of the inverting amplifier is small voltage, the output of the inverting amplifier is very high voltage.

Hence, the option (C) is the correct answer.

Note: This large output gain is attained by the feedback to the inverting terminal of the input through a feedback resistor, by the feedback loop the overall gain of the output of the inverting amplifier is obtained. Now the inverting amplifier is said to be a closed loop which uses negative feedback to control the output.