MCQOPTIONS
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MCQOPTIONS
| 1. |
In a voltage-series-feedback amplifier with open loop gain Av and the feedback factor β, the input resistance becomes |
| A. | \(\frac{{{R_i}}}{{\left( {1 + \beta {A_v}} \right)}}\) |
| B. | \({R_i}\sqrt {\left( {1 + \beta {A_v}} \right)} \) |
| C. | Ri (1 + βAv) |
| D. | \(\frac{{{R_i}}}{{\sqrt {\left( {1 + \beta {A_v}} \right)} }}\) |
| Answer» D. \(\frac{{{R_i}}}{{\sqrt {\left( {1 + \beta {A_v}} \right)} }}\) | |