27.4. Impact of Emitter Resistor on Gain

Try these first

1. 1.

   What is the formula for voltage gain in a common emitter amplifier?

   Hint

   Consider how R_E affects gain.

2. 2.

   Define transconductance.

   Hint

   Think about what controls the output current.

3. 3.

   What effect does an emitter resistor have on amplifier gain?

   • It increases gain
   • It decreases gain
   • It does not affect gain

   Hint

   Consider the role of gain in relation to stability.

4. 4.

   True or False: The emitter resistor can improve the amplifier's input resistance.

   • True
   • False

   Hint

   Think about how R_E connects in relation to input source.

5. 5.

   You are tasked with designing a common emitter amplifier with a specific voltage gain of 50. If the transconductance g_m is 5 mS, calculate the required values for R_C and R_E assuming a specific configuration.

   Hint

   First isolate R_C or R_E and consider realistic resistor values.

6. 6.

   Explain how to mitigate input signal loss while keeping the emitter resistor in a circuit and provide a design example using bypass capacitors.

   Hint

   Refer to the RC time constant and how it affects frequency response.