Simplified "Y" Parameter Analysis of Multistage Linear Amplifiers

Cascaded amplifier stages are commonly found today in both the discrete and integrated circuit applications. The circuit designer would like to simplify the complex problem of analysis and design and wind up with an equivalent circuit expressed in terms of readily available parameters. To accomplish this, various building block amplifier stages are considered. The composite equivalent circuit of the various building block amplifiers are presented in their exact and approximate forms in terms of common emitter "y" parameters. An example of this technique is used in the analysis of a 45 MHz integrated circuit amplifier.