Unit 13. Cascaded Amplifier Stages

The cascade electronic circuit configuration is that formed by connecting the output of one stage to the input of the one following. In analog amplifiers, such as the operational amplifier, high gain is achieved through cascading a number of stages. Mixing NMOS and PMOS circuits provides the major advantage of direct coupling between stages. The amplifier investigated is the cascade of a differential stage and a common-source stage. Circuit bias stability is explored as an example of problems in general with direct stage coupling.