EL4332
A Bandwidth Selectable Circuit
In Figure 30, a circuit is shown that allows three signals to be
either low pass filtered or full bandwidth.
This could be useful where an input signal is frequently
noisy. The component values shown give a Butterworth LPF
response, with a -3dB frequency of 50MHz. Note again, the
resistor values are low, so that stray capacitance does not
affect the desired cut-off frequency.
FIGURE 30. SWITCHED 50MHz LOW PASS FILTER FOR HIGH/LOW RESOLUTION MONITORS
11