Operational Amplifier Applications Unit 4 – High Pass Filter
Exercise 2 – Phase and Transient Response
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to deter-mine the phase and transient
response characteristics of a high pass filter by analyzing input and output waveforms. You will
verify your results with an oscilloscope.
DISCUSSION
- High pass filters cause phase shifts between the input and output signals. The phase shift
characteristics depend on the type of response (Butterworth, Bessel, or Chebyshev, for
example). - Phase shift decreases as frequency increases.
- Phase shift increases as the order number increases.
- Transient response of a high pass filter is its ability to react to changes in the input signal.
- Transient signals to a high pass filter can produce output distortion; examples are overshoot,
undershoot, and ringing. - Damping is used to reduce of eliminate overshoot, undershoot, and ringing.
- Large amounts of damping can result in an overdamped output, which can severely delay the
filter’s response to step input signals.