From d8cfe22501e3e85654d20dab90bceb822de00c57 Mon Sep 17 00:00:00 2001 From: SingularitySurfer Date: Thu, 23 Jun 2022 15:18:55 +0000 Subject: [PATCH] add note about setpoint resolution --- artiq/coredevice/phaser.py | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/artiq/coredevice/phaser.py b/artiq/coredevice/phaser.py index bb3cfd6df..c6e614a01 100644 --- 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):