Advanced Qualification · A-002 Advanced components and circuits · A-002-007-005
Dans un amplificateur en base commune, l'impédance d'entrée est __________ par rapport à l'impédance de sortie :
- Alégèrement plus haute
- Blégèrement plus basse
- Ctrès haute
- Dtrès basse
Correct answer: D — très basse. Question tirée de la banque officielle d'ISDE.
Why
In a common base amplifier, the signal enters at the emitter, which presents a very easy path for current to flow, resulting in an input impedance that is very low compared to the high impedance found at the collector output. The full explanation — and one for every question — is in Pro.
Practise this section
Advanced components and circuits is section A-002 of the Advanced exam: Advanced components and circuits: semiconductors, amplifier classes, oscillators, mixers, filters and digital logic.
Drill A-002 — free, no account