R–L–C series circuits are often used as filters. The
common use of R–L–C circuits as band-pass and
band-stop filters are described in the following
sections.
4.3.1 Band-pass Filter
A series R–L–C circuit with L–C part placed in between the input and the output has been
shown in Figure 4.5. The output is taken across the resistor as shown. At resonant frequency,
the capacitive reactance is equal to the inductive reactance and the two reactances cancel each
other. The circuit works as a band-pass filter. Signals at resonant frequency are allowed to pass
from input to output without ...
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