add note about setpoint resolution

2022-06-23 15:18:55 +00:00 · 2022-06-23 15:18:55 +00:00 · d8cfe22501
commit d8cfe22501
parent 2e834cf406
1 changed files with 4 additions and 0 deletions
--- a/artiq/coredevice/phaser.py
+++ b/artiq/coredevice/phaser.py
@ -1144,6 +1144,10 @@ class PhaserChannel:

        Gains are given in units of output full per scale per input full scale.

+        .. note:: Due to inherent constraints of the fixed point datatypes and IIR
+        filters, the setpoint resolution depends on the selected gains. This is
+        especially the case for low ``ki`` gains.
+
        The transfer function is (up to time discretization and
        coefficient quantization errors):