### Bridged tee attenuator:
__Zin__ desired input impedance in &#x2126;<br>
__Zout__ desired output impedance<br>
__Z<sub>0</sub> = Zin = Zout__<br><br>

* __a__ attenuation in dB
* __L = 10<sup>a/20</sup>__ (the loss)<br><br>
* ___R1 = Z<sub>0</sub> \* (L - 1)___
* ___R2 = Z<sub>0</sub> / (L - 1)___