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Phaser: expose coarse mixer and document need to enable the DAC-mixer. 

in some use cases a larger tunable range than available via the DUC may
be needed. Some use cases may wish to combine the coarse mixer with the
DUC to extend the tunable range.

Signed-off-by: Marius Weber <marius.weber@physics.ox.ac.uk>
This commit is contained in:
Marius Weber 2021-04-02 21:05:23 +01:00
parent 4f812cc4ed
commit 515cfa7dfb
1 changed files with 27 additions and 0 deletions
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27
artiq/coredevice/phaser.py
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@ -570,6 +570,27 @@ class Phaser:
self.dac_write(0x1f, config1f & ~int32(1 << 1))
self.dac_write(0x1f, config1f | (1 << 1))
@kernel
def set_dac_cmix(self, fs_8_step):
"""Set the DAC coarse mixer frequency for both channels
The selected coarse mixer frequency becomes active without explicit
synchronisation.
Use of the coarse mixer requires the DAC mixer to be enabled. The mixer
can be configured via the `dac` device_db entries.
:param fs_8_step: coarse mixer frequency shift in 125 MHz steps. This
should be an integer between -3 and 4 (inclusive).
"""
# values recommended in data-sheet
# 0 1 2 3 4 -3 -2 -1
vals = [0b0000, 0b1000, 0b0100, 0b1100, 0b0010, 0b1010, 0b0001, 0b1110]
cmix = vals[fs_8_step%8]
config0d = self.dac_read(0x0d)
delay(.1*ms)
self.dac_write(0x0d, (config0d & ~(0b1111 << 12)) | (cmix << 12))
@kernel
def get_dac_alarms(self):
"""Read the DAC alarm flags.
@ -784,6 +805,9 @@ class PhaserChannel:
"""Set the NCO frequency.
The frequency is only applied after DAC synchronisation.
Use of the NCO requires the DAC mixer to be enabled. The mixer can be
configured via the `dac` device_db entries.
:param ftw: NCO frequency tuning word (32 bit)
"""
self.phaser.dac_write(0x15 + (self.index << 1), ftw >> 16)
@ -794,6 +818,9 @@ class PhaserChannel:
"""Set the NCO frequency in SI units.
The frequency is only applied after DAC synchronisation.
Use of the NCO requires the DAC mixer to be enabled. The mixer can be
configured via the `dac` device_db entries.
:param frequency: NCO frequency in Hz (passband from -400 MHz
to 400 MHz, wrapping around at +- 500 MHz)
"""