mirror of https://github.com/m-labs/artiq.git
55 lines
2.5 KiB
Python
55 lines
2.5 KiB
Python
from artiq.coredevice.spline import Spline
|
|
|
|
|
|
class SAWG:
|
|
"""Smart arbitrary waveform generator channel.
|
|
The channel is parametrized as: ::
|
|
|
|
oscillators = exp(2j*pi*(frequency0*t + phase0))*(
|
|
amplitude1*exp(2j*pi*(frequency1*t + phase1)) +
|
|
amplitude2*exp(2j*pi*(frequency2*t + phase2)))
|
|
|
|
output = (offset +
|
|
i_enable*Re(oscillators) +
|
|
q_enable*Im(buddy_oscillators))
|
|
|
|
Where:
|
|
* offset, amplitude1, amplitude2: in units of full scale
|
|
* phase0, phase1, phase2: in units of turns
|
|
* frequency0, frequency1, frequency2: in units of Hz
|
|
|
|
:param channel_base: RTIO channel number of the first channel (amplitude).
|
|
Frequency and Phase are then assumed to be successive channels.
|
|
"""
|
|
kernel_invariants = {"channel_base", "core",
|
|
"amplitude1", "frequency1", "phase1",
|
|
"amplitude2", "frequency2", "phase2",
|
|
"frequency0", "phase0", "offset"}
|
|
|
|
def __init__(self, dmgr, channel_base, parallelism, core_device="core"):
|
|
self.core = dmgr.get(core_device)
|
|
self.channel_base = channel_base
|
|
width = 16
|
|
time_width = 16
|
|
cordic_gain = 1.646760258057163 # Cordic(width=16, guard=None).gain
|
|
# cfg: channel_base
|
|
self.offset = Spline(width, time_width, channel_base + 1,
|
|
self.core, 1/2)
|
|
self.amplitude1 = Spline(width, time_width, channel_base + 2,
|
|
self.core, 1/(2*cordic_gain**2))
|
|
self.frequency1 = Spline(3*width, time_width, channel_base + 3,
|
|
self.core, self.core.coarse_ref_period)
|
|
self.phase1 = Spline(width, time_width, channel_base + 4,
|
|
self.core, 1.)
|
|
self.amplitude2 = Spline(width, time_width, channel_base + 5,
|
|
self.core, 1/(2*cordic_gain**2))
|
|
self.frequency2 = Spline(3*width, time_width, channel_base + 6,
|
|
self.core, self.core.coarse_ref_period)
|
|
self.phase2 = Spline(width, time_width, channel_base + 7,
|
|
self.core, 1.)
|
|
self.frequency0 = Spline(2*width, time_width, channel_base + 8,
|
|
self.core,
|
|
self.core.coarse_ref_period/parallelism)
|
|
self.phase0 = Spline(width, time_width, channel_base + 9,
|
|
self.core, 1.)
|