i^)l 



HELL SYSTEM TECILXICAL JOLRSAL 



an operating point and load impedance such as to avoid these non-linear 

 effects as long as possible. Reverting to Fig. 24, since one wants as large a 

 product of AV- AI as possible, the problem may be thought of in geometrical 

 terms as appro.ximately that of constructing the largest possible rectangle 

 such that a load line extending diagonally across the corners of this rectangle 



COLLECTOR CURRENT, Ic, IN MILLIAMPERES 

 -25 -20 -15 -10 -5 



Fig. 24— Collector power output plot. 



lies within the "linear" region of operation. The slope of this line gives the 

 load impedance required, its intercept the collector supply voltage (for 

 resistance coupling), and the sides of the rectangle give the extreme values 

 of voltage and current. The center of the rectangle is approximately the 

 quiescent or small-signal operating point. 



Under optimum conditions of load impedance and operating point, 



