Related to 29870, 29804,

I have taken open loop transfer functions of the 1st loop in this morning to see where the UGF currently is.

Based on the measurements, I set the gain slider in the medm to 9 dB which gives us a UGF of 50-60 kHz.

Also, the raw data is attached as a zipped file.

Apart from these measurements, I confirmed two features as follows.

• The gain slider in the medm is miscalibrated. An X dB change in the gain slider introduces a 2X dB gain change in the open loop transfer function.
• The overall gain does not linearly scale with the gain slider any more if the UGF goes above roughly 70 kHz.
  • Also, a significant drop starts showing up at around 80 kHz due to presumably some saturation/nonlinearily somewhere in the circuit.

During the measurements, I kept the suspiciously high offset value of 20 for the 1st loop. The second loop was off.