348 



THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 



In this case the fractional remainder consists of a zero at the origin 

 and two conjugate complex poles which are realized by the R-C structure 

 shown in Fig. 13(c). 



III. PRODUCTION OF DELAY 



It has also been proposed that a two terminal active delay eciualizer 

 can be constructed with the help of a negative resistance. As shown in 

 Fig. 14 a two terminal network Z is connected between a resistive source 

 and load, each of magnitude, one quarter R^. The network Z consists of 

 a parallel combination of a reactive network ^X and a negative resistance 

 ( — 7?o)- The transmission through Z is 



e = 



Ro 



"2" 



2" 



i^o - jX 

 jRoX Ro + jX 



■So 1^ ^ Ro ^^ 

 2 +^ ~2'^ Ro~jX 



This is the desired function, because the amplitude of the transmission 



2 4 6 8 10 12 14 16 18 



FREQUENCY IN KILOCYCLES PER SECOND 



Fig. 14 — Active all-pass section. 



