TRANSISTOE PULSE REGENERATIVE A.MPLIFIERS 



1081 



This goal of reliable circuit operation can be realized if the amplifiers 

 have : 



a. Simple circuitry with a minimum number of parts. 



b. The ability to operate with wide variations of signal level. 



c. Ample margins against crosstalk and noise. 



d. Low sensitiveness to changes in component values. 



e. Low power dissipation to realize long component life. 



f . Sufficient gain margins with system variations. 



Although these features are desirable in any circuit, they are often 

 subordinated in order to obtain special performance, usually at the ex- 

 pense of reliability. In the amplifiers under discussion these features rep- 

 resent the primary design goal. 



As is so often true, some compromises usually must be made to obtain 

 a suitable balance of these features in a particular design. It is sometimes 

 possible to accept an increase in power consumption for other desired 

 performance. However, because of the large number of amplifiers em- 

 ployed, low power operation is desirable in order to reduce the physi- 

 cal size and weight of a system. In this paper considerable emphasis is 

 placed on efficient low power circuits which do not require critical com- 

 ponents. 



A convenient way to study regenerative amplifiers is to consider an 

 amplifier as a small system. The following functional breakdown has- 

 been found useful: 



a. Transistor properties. 



b. Feedback circuits. 



c. Input trigger circuits. 



d. Output coupling circuits. 



e. Synchronizing circuits. 



The block diagram of an amplifier then might take the form shown in 



Fig. 2 — Regenerative amplifier block diagram. 



