The figure below shows a wide-band practical amplifier composed of two-stage common emitter amplifiers. Input, output and inter-electrode coupling are all capacitors. C4 and cs are emitter decoupling capacitors to eliminate AC negative feedback and enhance the ability to amplify AC signals. The inductor (10 yH) connected to the -15V power supply and It6, C3, Rii, island, C2, etc. are all filters to filter out ripples in the power supply.
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