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Old 3rd November 2013, 01:59 PM   #1
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Default MAT12 / MAT14 based headphone amp

Due to the complete lack of interest this thread can be closed.
Thanks!
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Last edited by macplauder; 19th November 2013 at 02:25 PM. Reason: Can be closed
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Old 3rd November 2013, 04:37 PM   #2
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Here's a jpeg of the circuit.

I think the problem is the output network, I was trying to stabilize the amplifier for a maximum 10nF capacitive load and that requires either a big output resistor (~100 ohms) or a big compensation C.

So the compensation needs some fixup. Any suggestions?
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Old 3rd November 2013, 05:04 PM   #3
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Ok I changed the output network and compensation, it now has a loop compensation C from output to inverting input and an RC at the VAS output. Spice predicts 50 phase margin (see picture). I'm still a noob at this poles/zeroes stuff so no idea what the resistor in series with the VAS compensation C does but it did improve things

It now has 10.4V/us slew rate (tested with 1Vp 300K input signal).

Any suggestions on how to come up with an ideal combination of R's and C's to compensate this thing?
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Last edited by macplauder; 3rd November 2013 at 05:14 PM.
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Old 5th November 2013, 08:22 PM   #4
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Simulated results:
0.000534% THD @20kHz, 9.26Vp into 60 ohms,
0.000259% THD @1kHz, 9.26Vp into 60 ohms
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