What to study after discrete bjt amplifiers?

Question

I am a novice interested in learning amplifier design for audio projects.  I can design simple "elementary" amplifiers such as CE, CB, and CC and can make them work with desired impedances, good biasing, and properly-sized coupling capacitors.  I am good with basics like Ohms Law, KVL/KCL, and can do simple analysis of discrete bjt circuits.  I have probably a basic understanding of transistor models like hybrid-pi.
I'd like to get to the point where I can design more useful circuits with multiple stages that would actually work to drive real-life speakers, but have struggled to find a good source.
I don't know what I'm missing, but when I look online for information on combining stages, power amplifiers, class AB amplifiers and the like it's clear that there are gaps in my knowledge.
What is the next thing I need to learn about?  And, perhaps more importantly, can you suggest a book that might meet me at my level?

analogsystemsrf · Accepted Answer

I suggest you examine the various functions of this circuit (question asked today)
Output Stage Clipping
where

diffpairs are the input (PNPs) with current source

differential_to_single_ended converter

rail_to_rail gain stage

biasing, which is ttemperature-compensated

output devices that need debugging

with problems

greatly imbalanced source resistances into bases of the diffpairs; left transistor has 10Kohm; right transistor has (the global feedback network) 2K || 20K; these imbalances cause output DC offset voltage that will injure the loudspeaker load

no frequency compensation, so probably the amplifier will oscillate

no ZOBEL network (series R+C) on output, to help stabilize the amplifier

Phil Freedenberg · Answer

I'd suggest Field Effect Transistors as your next field of study. There are several different types and you will find widespread applications.

What to study after discrete bjt amplifiers?

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