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add note about setpoint resolution

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SingularitySurfer 2022-06-23 15:18:55 +00:00
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artiq/coredevice/phaser.py
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@ -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):