### Tee Attenuator
__Zin__ desired input impedance in &#x2126;<br>
__Zout__ desired output impedance<br>
__Zin = Zout__<br><br>

* __a__ attenuation in dB
* __L = 10<sup>a/20</sup>__ (the loss)
* ___A = (L + 1) / (L - 1)___<br><br>
* ___R2 = 2 &radic; (L \* Z<sub>in</sub> \* Z<sub>out</sub> ) / (L - 1)___
* ___R1 = Z<sub>in</sub> \* A - R2___
* ___R3 = Z<sub>out</sub> \* A - R2___
