I reversed engineered a headphone amplifier based on composite topology with opa1612 and tpa6120a2.

There's two capacitor and one resistor (circled in red) that I don't quite understand. I know this is for stabilizing the circuit, but don't understand the theory behind it. could someone give some hints/pointers to help me understand it? Thanks!

circuit diagram

  • 1
    \$\begingroup\$ I'd argue that the top 560p cap is useless. Google "In-the-loop compensation" to understand how the caps from output to inverting input improve stability. It is needed for fast opamps like the opa1612 or when you have high feedback impedances. \$\endgroup\$ – tobalt Apr 19 at 6:38
  • \$\begingroup\$ Thank you so much @tobalt! This is exactly what I was looking for! \$\endgroup\$ – Yue Wang Apr 19 at 7:43

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