Question
Download Solution PDFWhat value of input resistance is needed in the given circuit to produce the given output voltage ?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
For an inverting amplifier, as shown above, the voltage gain is given by:
\(A_v=\frac{V_{out}}{V_{in}}\)
The ideal opamp will be having virtual ground and the current entering the op-amp will be 0.
Therefore, by applying KCL at the inverting terminal of opamp we get:
\(\frac{V_{in}-0}{R_1}=\frac{0-V_{out}}{R_f}\)
\(\frac{V_{out}}{V_{in}}=-\frac{R_f}{R_i}\)
Calculation:
\(\frac{V_{out}}{V_{in}}=-\frac{R_f}{R_i}\)
Ri = (60 × 10-3 × 200 × 103)/3
Ri = 4 kΩ
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