Question

1) Since current normally flows out of the emitter of a PNP, the emitter is usually drawn pointing down towards the negative power supply.

Select one:

True

False

2)

For a MOS common-source amplifier, which of the following is true ?

Select one:

a. The voltage gain is typically low

b. The input resistance is typically high

c. The voltage gain is positive

d. None of these

e. The output resistance is typically low

3)

The gain of a common-emitter BJT amplifier can be estimated by the ratio of the bias voltage across the collector resistor to the bias voltage across the emitter resistor.

Select one:

True

False

Answer 1

1. False

The PNP transistor emitter is made up of P type material, so it sinks the current into the base. So current is flow into the emitter. Also emitter junction is always forward bias and it usually drawn pointing down towards the positive power supply.

2. b. The input resistance of amplifier is typically high.

The input resistance of MOS CS amplifier is infinite.

3. False

CE BJT amplifier has two form of gain: current gain and voltage gain. The current gain ? for the CE amplifier circuit is the ratio of collector current to base current. The voltage gain is the ration of change in amplifiers output voltage to the change in input voltage.