Noisiness of the video amplifier made by the cascode circuit with dynamic load

Abstract

Relative influence of active elements on noises of video amplifier cascode circuit at resistive loading and at use of an active element as the cascade dynamic load has been considered. The conclusion is drawn that in both cases the second transistor of the cascode circuit contributes insignificantly into amplifier noises in comparison with the first one. The contribution of active element noises of dynamic load exceeds considerably the contribution of traditional resistive loading of the cascade and doubles practically in capacity the noises conditioned by the first active element.