Multistage Transistorized Current Modules

The choice of current as signal parameter leads to the design of amplifiers, in which voltage swings are minimized throughout. These amplifiers utilize the full accidental current gain of the transistors by employing a particular class of feedback systems, whose natural frequencies approach asymptotically a well-defined value as the loop-gain at dc approaches infinity. This design method provides complete control by external circuitry over transistors by grouping them in pairs or triples into building blocks which may be suitably interconnected into complete feedback amplifiers comprising six or more transistors in a single loop. Two practical examples are given for commerical current amplifiers( Manufactured by Elron Electronic Industries, Ltd., Haifa, Israel.) incorporating these design principles.