Question

An inverting amplifier circuit has R1= 1k-ohm and Rf = 3k ohm. determine the output voltage, the input resistance, and the input current for a input voltage of 2V. ​

Answer 1

Explanation:

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Answer 2

Given:

R1= 1 KΩ

Rf = 3 K Ω

Vin = 2 V

To find:

1) Vout =?

2) Rin =?

3) Iin =?

Explanation:

1)

An inverting amplifier is a type of operational amplifier circuit that produces an output that is out of phase with respect to its input by $\displaystyle 180^o$.

Vout =  $V_in (\frac{-R_f}{R_1})$

       =  $\frac{2 \times (-3) }{1}$

Vout = - 6 V

2)

Generally, R1 is considered as input resistance.

∴ R1 = Rin

Rin = 1 KΩ

3)

Input voltage is the product of input current & input resistance.

Vin = Iin × Rin

2 = Iin  × 1

lin = 2 KA