Advanced Qualification · A-002 Advanced components and circuits · A-002-008-005
Quelle est l'impédance d'entrée d'un amplificateur opérationnel théoriquement idéal?
- AExactement de 100 ohms
- BExactement de 1 000 ohms
- CTrès haute
- DTrès basse
Correct answer: C — Très haute. Question tirée de la banque officielle d'ISDE.
Why
A theoretically ideal operational amplifier, or op-amp, is designed to sense voltage without drawing any current from the source, which means its input impedance must be extremely large. 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