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FIXED  ATTENUATORS

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FIXED ATTENUATORS

 

Fixed attenuators can be designed to have either equal or unequal impedances and to provide any amount of attenuation (theoretically) equal to or greater than the configuration's minimum attenuation - depending on the ratio of Z1/Z2. Attenuators with equal terminations have a minimum attenuation of 0 dB. Unequal terminations place a lower limit on the attenuation.

K = power in / power out, or in decibels = 10 * log (K) dB

, or in decibels KMIN = 10 * log (Kmin) dB
 

Unbalanced Tee Attenuator

If Z1 = Z2, then:

Balanced Tee Attenuator
 
Unbalanced Pi (p) Attenuator

If Z1 = Z2, then:

 

Balanced Pi (p) Attenuator