Question 1 |

A good transimpedance amplifier has

low input impedance and high output impedance. | |

high input impedance and high output impedance. | |

high input impedance and low output impedance. | |

low input impedance and low output impedance. |

Question 1 Explanation:

A good transimpedance amplifier should have low
input impedance and low output impedance

Question 2 |

A good transconductance amplifier should have

high input resistance and low output resistance | |

low input resistance and high output resistance | |

high input and output resistances | |

low input and output resistance |

Question 2 Explanation:

A good transconductance amplifier should have
very high input resistance and very high output
resistance.

Question 3 |

The desirable characteristics of a transconductance amplifier are

high input resistance and high output resistance | |

high input resistance and low output resistance | |

low input resistance and high output resistance | |

low input resistance and low output resistance |

Question 4 |

The feedback topology in the amplifier circuit ( the base bias circuit is not shown
for simplicity) in the figure is

Voltage shunt feedback | |

Current series feedback | |

Current shunt feedback | |

Voltage series feedback |

Question 4 Explanation:

The feedback topology in the amplifier circuit is

current series because

Sampling \rightarrow Current

Mixing \rightarrow Series

So current-series feedback

current series because

Sampling \rightarrow Current

Mixing \rightarrow Series

So current-series feedback

Question 5 |

In the ac equivalent circuit shown in the figure, if i_{in}
is the input current and
R_{F}
is very larger, the type of feedback is

voltage-voltage feedback | |

voltage-current feedback | |

current-voltage feedback | |

current-current feedback |

Question 5 Explanation:

Sampling \rightarrow current

Mixing \rightarrow voltage

Mixing \rightarrow voltage

Question 6 |

In a voltage-voltage feedback as shown below, which one of the following statements is TRUE if the gain k is increased?

The input impedance increases and output impedance decreases. | |

The input impedance increases and output impedance also increases. | |

The input impedance decreases and output impedance also decreases. | |

The input impedance decreases and output impedance increases. |

Question 6 Explanation:

The given configuration is a voltage-series feedback configuration.

So, the input impedance increases

R_{i f}=R_{i}\left(1+A_{0} K\right)

and, the output impedance decreases

R_{o f}=\frac{R_{o}}{1+A_{o} K}

So, the input impedance increases

R_{i f}=R_{i}\left(1+A_{0} K\right)

and, the output impedance decreases

R_{o f}=\frac{R_{o}}{1+A_{o} K}

Question 7 |

In a transconductance amplifier, it is desirable to have

a lage input resistance and a large output resistance | |

a large input resistance and a small output resistance | |

a small input resistance and a large output resistance | |

a small input resistance and a small output resistance |

Question 8 |

The input impedance (Z_{i}) and the output impedance (Z_{0}) of an ideal transconductance (voltage controlled current source) amplifier are

Z_{i}=0,Z_{0}=0 | |

Z_{i}=0,Z_{0}=\infty | |

Z_{i}=\infty ,Z_{0}=0 | |

Z_{i}=\infty ,Z_{0}=\infty |

Question 9 |

The effect of current shunt feedback in an amplifier is to

increase the input resistance and decrease the output resistance | |

increases both input and output resistance | |

decrease both input and output resistance | |

decrease the input resistance and increase the output resistance |

Question 10 |

Voltage series feedback (also called series-shunt feedback) results in

increase in both input and output impedances | |

decrease in both input and output impedances | |

increase in input impedance and decrease in output impedance | |

decrease in input impedance and increase in output impedance |

There are 10 questions to complete.