Transistor Feedback Circuits Unit 5 – Differential Amplifiers
Exercise 3 – Gain
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to measure common mode gain by
using a typical differential amplifier circuit. You will verify your results with an oscilloscope, a
signal generator, and a multimeter.
EXERCISE DISCUSSION
- A signal applied to both inputs (Vi1 and Vi2) at the same time is called a common mode
signal. - A characteristic of the differential amplifier is its ability to reject common mode signals.
- Common mode signals are rejected only at the differential output; the single-ended outputs
contain the common mode signals.