Impedance: The Key to Understanding MOS Transistors?

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SUMMARY

This discussion centers on the concept of impedance in relation to MOS transistors and AC circuits. Impedance combines resistance and reactance, which is crucial for understanding current behavior in these systems. The conversation highlights that while resistors exhibit resistance, capacitors and inductors introduce reactance, affecting the phase relationship between voltage and current. This understanding is essential for grasping the complexities of AC circuit analysis.

PREREQUISITES
  • Understanding of basic electrical concepts, including voltage and current.
  • Familiarity with AC circuit theory, particularly the role of capacitors and inductors.
  • Knowledge of resistance and reactance in electrical components.
  • Basic grasp of phase relationships in alternating current systems.
NEXT STEPS
  • Study the principles of impedance in AC circuits, focusing on its mathematical representation.
  • Learn about the differences between resistance and reactance in electrical components.
  • Explore the role of MOS transistors in circuit design and their relationship with impedance.
  • Investigate the implications of phase shifts in AC circuits and their impact on circuit performance.
USEFUL FOR

Electrical engineering students, circuit designers, and anyone interested in the principles of AC circuit analysis and MOS transistor functionality.

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Hello.

In a class today, the lecturer said, in an introduction to the material that will be covered, something along the lines of "..and the current is kept relatively flat (low?) thanks to impedance ..."

Is this because impedance acts like resistance (but in AC circuits), or would there be another reason?

I was going to ask after the class, but the fire alarm went off, and we all hightailed it out of there.

I only ask because, for some reason, impedance always seems a bit complicated to me ...more complicated than it needs to be I am sure.

-S
 
Last edited:
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I love it...'the fire alarm went off'
You are on the right track... Resistors have resistance, capacitors and inductors have 'Reactance'...a different name is needed because volts and amps are 90 degrees out of phase for these components so volts/amps has a subtly different meaning but can still be called 'ohms'
Impedance is the name given to the combined resistance and reactance in a circuit.
You are in for some fun by the sound of it...you will look forward to the fire alarm going off again!
 

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