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BELL SYSTEM TECHNICALpOURNAL 



of phase versus frequency and drawing a smooth curve weighting the points 

 in accordance with the errors known by experience to occur for various types 



(fo.Ao) 



f,0= OoWi'o.A'k)^ 



0.2 0.3 0.4 0.6 0.8 1 1.5 2 3 4 5 



FREQUENCY (f) 



6 8 10 15 20 30 40 50 



Fig. 5-20 log I Z|. 



of departures of the straight line approximation from the exact char- 

 acteristic. 



Although the degree and db relationship is applicable to attenuation and 

 phase computations, nepers and radians are proper theoretical units which 

 can be used in other problems^ For instance, Tables III and I\' give the 



* Bode, "Network Analysis and Fcedljack Amplifier Design," C'hapter XV, page 340. 



% 



