suservo.py: remove unnecessary import
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@ -821,16 +821,16 @@ In the following example, the amplitude of DDS is proportional to the ADC input
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First, initialize the RTIO, SU-Servo and its channel.
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Note that the programmable gain of the Sampler is $10^0=1$, the input range is [-10V, 10V].
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\inputcolorboxminted{firstline=12,lastline=19}{examples/suservo.py}
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\inputcolorboxminted{firstline=10,lastline=17}{examples/suservo.py}
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Next, setup the PI control as an IIR filter. It has -1 proportional gain $k_p$ and no integrator gain $k_i$.
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\inputcolorboxminted{firstline=20,lastline=27}{examples/suservo.py}
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\inputcolorboxminted{firstline=18,lastline=25}{examples/suservo.py}
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Then, configure the DDS frequency to 10 MHz with 3V input offset.
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When input voltage $\geq$ offset voltage, the DDS output amplitude is 0.
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\inputcolorboxminted{firstline=28,lastline=32}{examples/suservo.py}
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\inputcolorboxminted{firstline=26,lastline=30}{examples/suservo.py}
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SU-Servo encodes the ADC voltage in a linear scale [-1, 1].
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Therefore, 3V is converted to 0.3.
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@ -838,7 +838,7 @@ Note that the ASF of all DDS channels are capped at 1.0, the amplitude clips whe
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Finally, enable the SU-Servo channel with the IIR filter programmed beforehand.
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\inputcolorboxminted{firstline=34,lastline=35}{examples/suservo.py}
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\inputcolorboxminted{firstline=32,lastline=33}{examples/suservo.py}
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A 10 MHz DDS signal is generated from the example above, with amplitude controllable by ADC.
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The RMS voltage of the DDS channel against the ADC voltage is plotted.
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@ -1,6 +1,4 @@
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from artiq.experiment import *
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from scipy import signal
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import numpy
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class SUServoExample(EnvExperiment):
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