Greetings. I have an audio chain that uses a SSM2167 to provide compression and limiting. My circuit works well until the input voltage exceeds the Rotation Point voltage (limit threshold). After the input exceeds VRP and drops back to 0 V, the output has a sawtooth waveform for about one second. The amplitude is above the noise floor (see photo below) so I hear a tone at the output of my system overall. The time duration for one period is about 1 mS (1 kHz) and the amplitude is about 75 mV. I don't see this sawtooth at the input of the SSM2167 but I do see it on the output.
The circuit with drive and load are provided here. Where DNS for a component value means Do Not Stuff and the part is not present on the board.
The input is AC coupled and comes from the output of an op-amp through a divider. The output drives a power amp through a capacitor. Seems pretty simple.
Here are two shots of the o'scope signal of the sawtooth. The first has bars on the time axis and the second on the voltage axis.
Delta time between the bars is 992 uS. Delta voltage between the bars is 76 mV
Best I can tell, the various component values are within the limits and the input/output loads are within spec. None of these values seem to correlate with a 1mS time duration.
If anyone has any advice, I would love to hear it and try it out.