共源共栅放大器

DD

Why the V

GS constant?

Fig.1 CG stage with (a) direct coupling at input (b) capacitive coupling at input.

in out

in G1out DS Simple cascode amplifier

2221111o mb m o o in m out r g g r r v g i ++=

Fig.1 (a) Simple folded cascode, (b) folded cascode with proper biasing, (c) folded