TRANSISTOR CIRCUITS FOR ANALOG AND DIGITAL SYSTEMS 331 



unilateral. Fortunately, in many applications, this voltage can be neg- 

 lected even at the gain and phase crossover frequencies. 



In the case of single loop feedback amplifiers. A""* will not have any 

 zeros in the right hand half of the complex frequency plane. A study of 

 the stability of the amplifier can then be based on F^-, or T^-, . 



Appendix II 



INTERSTAGE NETWORK SHAPING 



This appendix presents the analysis of the circuit shown in Fig. 7(a). 

 The input impedance of the common emitter connected junction tran- 

 sistor is given by the expression 



^iNPUT = n-\- re(l - Gl) (A4) 



where Gi is the current transmission of the common emitter stage, ex- 

 pression (13). The current transmission A of the complete circuit is equal 

 to 



A = ^ = ^ 



I\ Zz -\- ^ IN PUT 



G, 



(A5) 



where Z3 = i?3 + V^ + (l/p<^3). Combining (13), (A4), and (A5) yields 



ao 



A = 



1 — ao + 5 



1 + 



C03 



+ V 





\ W5/ I, Wl 



(A6) 



+ p^ 



W5 , CsOO^in + Te -\- R3) 



_C0iC03- 



+ 



PCO5 



where 



WaWc(l — tto -}- 6) J ' CO3^C0aC0c(l — ^Q "j- 6) j 

 ^ ^ Rl + Te 



COl = 

 Wc = 



CO3 



OJs = 



