Passive signal processing and signal transmission 115
R/2
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lb
34
Screen Screen
IdB 2 dB 2 dB 5dBl()dB20dB 20 dB
(d)
Figure
5.2 Attenuators.
(a) Lossy line section used as an attenuator. Z,, = V(/?/G) and a = V(/?G), only true for small a (in nepers: see text).
(b) Attenuator design in exponential form: R, = Ro tanh a/2, Rp = /?„/sinha, true for all α (in nepers).
(c) Attenuator design in terms of input/output voltage ratio N: attenuation D = 201ogio Ν dB.
(d) 0-60 dB attenuator with 1 dB steps.
2
The attenuation constant α increase ...
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