782 



BELL SYSTEM TECHNICAL JOURNAL 



result in an improvement in linearity comparable with the circuit of Fig. 50a 

 where the plate supply voltage was increased by the same factor. 



I+B 



n F' 



^lT 



(a) 



;c E, 



I+B 

 >R 



"LT 



(b) 



LOW- 



IMPEDANCE 



OUTPUT 



Fig. 50. — Radar sweep generation circuits — ^basic form and modified by negative 

 feedback to improve linearity. 



Fig. 51. — Circuit employed to improve linearity of sweep wave form b}- integration 

 method. 



A furtlier method of improving the linearity of the generated sweep wave 

 form is illustrated in Fig. 51 where an additional correction voltage is super- 

 imposed on the exponential sweep wave form. This correction voltage is 



