23.7.2. Loading Effects in Current to Voltage Conversions

Try these first

1. 1.

   What is a current amplifier?

   Hint

   Think of the function it serves in electronics.

2. 2.

   Explain the purpose of DC bias in a current amplifier.

   Hint

   Consider what happens if a transistor is turned off.

3. 3.

   What is the unloaded current gain of a current amplifier?

   • 1
   • The ratio of output to input current
   • Always greater than 1

   Hint

   Think about what happens when no load is connected.

4. 4.

   True or False: Coupling capacitors allow DC signals to pass.

   • True
   • False

   Hint

   Consider the primary function of coupling capacitors.

5. 5.

   Design a current amplifier circuit to amplify a 10uA input current to 100uA with a load of 10 ohms. Calculate the required A, and resistance values.

   Hint

   Use the unloaded current gain formula.

6. 6.

   Discuss the primary trade-offs between high input resistance and low output resistance in application circuits for current amplifiers.

   Hint

   Consider how input and output impedances influence overall performance.