Operational Amplifier Applications Unit 4 – High Pass Filter
Exercise 1 – High Pass Filter Frequency Response
EXERCISE OBJECTIVE
When you have completed this exercise, you will be able to determine the frequency
characteristics of a high pass filter by examining input and output waveforms. You will verify
your results with an oscilloscope.
DISCUSSION
- Active high pass filters can be configured for different types of frequency response. The
relationship between circuit components defines the type of frequency response. - Three common high pass filters are Chebyshev, Butterworth, and Bessel.
- The Chebyshev filter has stopband characteristics closest to the ideal response.
- Bessel high pass filters have passband characteristics closest to the ideal response.
- Op amp (U1) is configured as a unity gain amplifier. The gain is one in the passband.
- R1 and C1 compose a lead network which makes the circuit a second order Butterworth
filter.