A comparison of three common emitter transistor servo preamplifiers

Synoysis: Three multistage transistor servo preamplifiers representing transformer coupling, resistance-capacitance (R/C) coupling, and direct coupling respectively are compared on the basis of design problems and performance. Experimental data referring to temperature stability and voltage response supplement the design and performance calculations for a particular application. Primary advantages and disadvantages of each type are presented, together with a brief discussion of application generalities.