I've recently built a stripped down version of the LME49600TSBD headphone amp in TINA-TI to simulate it. All measurements analysed well except for Square Wave. I placed a 10mA, 10kHz, 10ns square wave at the input and got a wildly oscillating transient response.
I've stripped the DC servo, and only simulated one channel in to a 25 Ohm load.
Can I get some assistance with making sense of this?