Week 03
Multistage Amplifiers
I study differential stages, feedback, filters, and output stages as one connected signal path.
What I connect in this unit
In a multistage amplifier, each following input resistance loads the preceding stage, so overall gain is smaller than a naive product of unloaded gains. DC level shifts and quiescent points must also preserve signal swing through the chain.
Concept map
- Interstage loading
- Overall gain
- DC level shifting
- Signal swing
Technical anchor
For two stages, Av,total = Av1,loaded·Av2 with Av1,loaded = Av1,0·Rin2/(Rout1 + Rin2), explicitly including interstage loading.
How I review it
List each stage DC output and allowable peak swing, then calculate whether the first-stage maximum signal exceeds a later input range or final output rail.
Connection to the full course
Unit 3 of 12. Unit numbers follow concept dependencies rather than the historical lecture calendar.