Transistor Feedback Circuits Unit 4 – Multistage Amplifier Feedback
Exercise 2 – Shunt-Series Output Impedance
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to measure shunt-series output
impedance by using a typical shunt-series multi-stage amplifier circuit. You will verify your
results with an oscilloscope and a multimeter.
DISCUSSION
- Circuit output impedance (Zo) equals the transistor collector impedance in parallel with the
collector resistor. - Zo = (Rco x Rc)/(Rco + Rc)
- Because of the high output impedance of the circuit, it acts as a constant current source for
small loads.