This Simple Programmable Attenuator Circuit performs the function of dividing the input signal by a
selected constant (1, 2, 4, 8, etc.). While T, Z, or L sections could
be used in the input attenuator, this is not necessary since the
amplifier loading is negligible and a constant input impedance is
maintained. The circuit is thus much simpler and more accurate than the
usual method of constructing a constant impedance ladder, and switching
sections in and out with analog switches. Two identical circuits can be used to attenuate a balanced line .
Simple Programmable Attenuator Circuit
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