AC2 Fundamentals Unit 6 – Bandpass and Bandstop Filters
UNIT 6 – BANDPASS AND BANDSTOP FILTERS
UNIT OBJECTIVE
At the completion of this unit, you will be able to analyze the operation of bandpass and
bandstop filters by using standard electronics formulas.
UNIT FUNDAMENTALS
Various combinations of inductors, capacitors, and resistors can be used to produce low-pass,
high-pass, bandstop, and bandpass filters.
Bandpass filters and bandstop filters select a specific range of frequencies. The types of
bandpass and bandstop filters studied in this unit use resonant circuits.
Bandpass filters can be implemented by connecting a series or parallel resonant circuit with a
resistor. This combination forms a voltage divider across the generator (VGEN).
A bandpass filter allows a narrow band of frequencies to pass but rejects frequencies above and
below that band. The range of frequencies passed by a band pass filter is the bandwidth (B),
which depends on the upper (f 2 ) and lower (f 1 ) cutoff frequencies.