Find value of series arm resistance for designing a pi-type attenuator to give attenuation of 20 dB and characteristic resistance of 500 ohm.
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The formation of the resistive elements into a letter “T” shape means that the T-pad attenuator has the same value of resistance looking from either end. This formation then makes the “T-pad attenuator” a perfectly symmetrical attenuator enabling their input and output terminals to be transposed as shown
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