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Hello, I am trying to work out the resistor values for an 'O' attenuator.

I am using the attached formula to work out resistor 3's value.

My values to insert into this formula are:

Input impedance (Z1) = 50 Ohm

Load impedance (Z2) = 600 Ohm

a =1.995

However when I substitute these figures I am getting a negative number result.

Obviously I can't have a negative Ohm resitor, so how do you interpret that ?

Thanks for any help

I am using the attached formula to work out resistor 3's value.

My values to insert into this formula are:

Input impedance (Z1) = 50 Ohm

Load impedance (Z2) = 600 Ohm

a =1.995

However when I substitute these figures I am getting a negative number result.

Obviously I can't have a negative Ohm resitor, so how do you interpret that ?

Thanks for any help

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