To build an amplifier with a $10 \mathrm {~K} \Omega$ input impedance and a voltage gain of 41 , use the amplifier, R_i=_______R_f= _________ A) inverting, $10 \mathrm { k } \Omega , 410 \mathrm { k } \Omega$ B) non-inverting, $40 \mathrm { k } \Omega , 200 \mathrm { k } \Omega$ C) non-inverting, $10 \mathrm { kO } \cdot 410 \mathrm { kO }$ D) inverting, $10 \mathrm { k } \Omega , 200 \mathrm { k } \Omega$

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Quizplus · Accepted Answer

DFor an inverting amplifier, the input impedance is determined by the input resistor, which can be directly set to $10 \mathrm {~K} \Omega$. The voltage gain ($A_v$) formula for an inverting amplifier is $-\frac{R_f}{R_{in}}$, where $R_f$ is the feedback resistor and $R_{in}$ is the input resistor. To achieve a gain of 41, if $R_{in} = 10 \mathrm {~K} \Omega$, then $R_f$ needs to be $410 \mathrm {~K} \Omega$, matching option A. Option D also suggests an inverting configuration with a $10 \mathrm {~K} \Omega$ input impedance, but the feedback resistor value is incorrect for the desired gain of 41.

To Build an Amplifier with A 10 KΩ10 \mathrm {~K} \Omega10 KΩ Input Impedance and a Voltage Gain of 41 , Use

To Build an Amplifier with A $10 \mathrm {~K} \Omega$ Input Impedance and a Voltage Gain of 41 , Use