In this paper we present a design for LD pumped high-gain amplifier system. Factors that have influence on the stability of the structures and method of improvement were fully discussed.

Many practical amplifiers chain together a series of analog amplifier stages to obtain a high overall voltage gain.

An instrumentation amplifier offers precise gain without feedback resistors, and, at any value of gain, it provides high input impedances at its noninverting and inverting inputs.