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suservo.py: remove unnecessary import

This commit is contained in:
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. 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]. 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 $k_i$. 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. Then, configure the DDS frequency to 10 MHz with 3V input offset.
When input voltage $\geq$ offset voltage, the DDS output amplitude is 0. 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]. SU-Servo encodes the ADC voltage in a linear scale [-1, 1].
Therefore, 3V is converted to 0.3. 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. 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. 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. 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 artiq.experiment import *
from scipy import signal
import numpy
class SUServoExample(EnvExperiment): class SUServoExample(EnvExperiment):