Question
Download Solution PDFIf the gain of a closed-loop inverting amplifier is 3.9 (magnitude) with an input resistor value of 1.6 K ohms, what value of feedback resistor is necessary ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
For an inverting amplifier, as shown above, the voltage gain is given by:
\(A_v=\frac{V_0}{V_{in}}=-\frac{R_f}{R_i}\)
Ri = Input resistance
Rf = Feedback resistance
Calculation:
Given Av = 3.9 and Rin = 1.6 kΩ
\(3.9=\frac{R_f}{1.6k}\)
Rf = 3.9 × 1.6k
Rf = 6.24 kΩ
Important Point:
The voltage gain of a non-inverting amplifier is given by:
\({A_v} = 1 + \frac{{{R_2}}}{{{R_1}}}\)
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