A low pass filter transmits low frequencies and attenuates high
frequencies. A typical frequency response is shown in Figure 18.5.
At low frequencies the output voltage is constant, but as the
frequency is increased a point will be reached when the output will
begin to fall. The cut-off frequency, /
c
, is where the output voltage
VQVT
1.0
3dB
down
0.707
0 ...
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