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suservo.py: remove unnecessary import

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occheung 2022-01-20 17:00:54 +08:00
parent ac8d398f5e
commit 708330a57a
2 changed files with 4 additions and 6 deletions
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8
4410-4412.tex
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@ -821,16 +821,16 @@ In the following example, the amplitude of DDS is proportional to the ADC input
First, initialize the RTIO, SU-Servo and its channel.
Note that the programmable gain of the Sampler is $10^0=1$, the input range is [-10V, 10V].
\inputcolorboxminted{firstline=12,lastline=19}{examples/suservo.py}
\inputcolorboxminted{firstline=10,lastline=17}{examples/suservo.py}
Next, setup the PI control as an IIR filter. It has -1 proportional gain $k_p$ and no integrator gain $k_i$.
\inputcolorboxminted{firstline=20,lastline=27}{examples/suservo.py}
\inputcolorboxminted{firstline=18,lastline=25}{examples/suservo.py}
Then, configure the DDS frequency to 10 MHz with 3V input offset.
When input voltage $\geq$ offset voltage, the DDS output amplitude is 0.
\inputcolorboxminted{firstline=28,lastline=32}{examples/suservo.py}
\inputcolorboxminted{firstline=26,lastline=30}{examples/suservo.py}
SU-Servo encodes the ADC voltage in a linear scale [-1, 1].
Therefore, 3V is converted to 0.3.
@ -838,7 +838,7 @@ Note that the ASF of all DDS channels are capped at 1.0, the amplitude clips whe
Finally, enable the SU-Servo channel with the IIR filter programmed beforehand.
\inputcolorboxminted{firstline=34,lastline=35}{examples/suservo.py}
\inputcolorboxminted{firstline=32,lastline=33}{examples/suservo.py}
A 10 MHz DDS signal is generated from the example above, with amplitude controllable by ADC.
The RMS voltage of the DDS channel against the ADC voltage is plotted.

2
examples/suservo.py
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@ -1,6 +1,4 @@
from artiq.experiment import *
from scipy import signal
import numpy
class SUServoExample(EnvExperiment):