[AUDITORY] [Documentation] Fully Balanced Audio Amplifiers

Subject: [AUDITORY] [Documentation] Fully Balanced Audio Amplifiers

From: Pierre Rodriguez <pierre.rodriguez@xxxxxxxxxxxxxxxxxxxxxxxxx>

Date: Fri, 9 May 2025 14:27:44 +0200

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Sender: AUDITORY - Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx>

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Thread-topic: Fully Balanced Audio Amplifiers

Hello all,

At the moment, I am studying some audio amplifiers topologies.

I am looking for technical documentations about "fully differential" amplifier. It means that not only the inputs of the amplifier are differentials, but the amplification stage as well. Per channel, there are two amplifiers, amplifying two opposite-phase signals (V+ and V-), finally driving the speaker (so instead of just a V+ signal referenced to GND).

If anyone knows someone who have made or know some precise studies about this topology (distortion, matching requirements, etc), I would be glad to hear from it.

Only thing I've found right now is this nice little article from TexasInstruments (https://www.ti.com/lit/an/slyt165/slyt165.pdf)

Thanks !

Pierre Rodriguez