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Normally it is hard to find a digital potentiometer with frequency grater than 5 Mhz. This design can provide digital signal attenuation upto 700Mhz in 125 steps. The steps can be modified by changing the resistances.
Working principle:
This works by summation of the weighted value of the signal.
Vout= (RaKa+RbKb+RcKc) Vin
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