50.1.4. Conclusion on Common Base Circuit

Try these first

1. 1.

   Define current gain in the context of common base circuits.

   Hint

   Think about the relationship between output and input currents in amplifiers.

2. 2.

   What does it mean for a circuit to be in an unloaded condition?

   Hint

   Consider how this configuration isolates the output for circuit analysis.

3. 3.

   What is the main advantage of low input resistance in a common base circuit?

   • Increases voltage gain
   • Allows use with lower power supplies
   • Accepts large input currents

   Hint

   Think about how input resistance affects current flow.

4. 4.

   True or False: The output current of a common base circuit can be equal to the input current under loaded conditions.

   • True
   • False

   Hint

   Consider what 'loaded condition' means.

5. 5.

   A common base amplifier has an input current of 2 mA and an output current of 1.8 mA. Calculate the current gain and discuss whether the circuit performs well as a buffer.

   Hint

   Consider the impact of the gain on circuit performance and its effectiveness in buffering.

6. 6.

   Design a common base circuit to amplify a current signal from a sensor that outputs 500 µA. If you need at least a factor of 5 gain, what should the output current be, and why might this configuration work well?

   Hint

   Reflect on how gain plays a role in the application of signal processing and amplification.