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phaser: rework docs

This commit is contained in:
Robert Jördens 2020-09-14 07:34:55 +00:00
parent b619f657b9
commit b449e7202b
1 changed files with 15 additions and 13 deletions
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artiq/coredevice/phaser.py
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@ -57,11 +57,11 @@ class Phaser:
Phaser contains a 4 channel, 1 GS/s DAC chip with integrated upconversion,
quadrature modulation compensation and interpolation features.
The coredevice produces 2 IQ data streams with 25 MS/s and 14 bit per
quadrature. Each data stream supports 5 independent numerically controlled
IQ oscillators (NCOs, DDSs with 32 bit frequency, 16 bit phase, 15 bit
amplitude, and phase accumulator clear functionality) added together.
See :class:`PhaserChannel` and :class:`PhaserOscillator`.
The coredevice produces 2 IQ (in-phase and quadrature) data streams with 25
MS/s and 14 bit per quadrature. Each data stream supports 5 independent
numerically controlled IQ oscillators (NCOs, DDSs with 32 bit frequency, 16
bit phase, 15 bit amplitude, and phase accumulator clear functionality)
added together. See :class:`PhaserChannel` and :class:`PhaserOscillator`.
Together with a data clock, framing marker, a checksum and metadata for
register access the streams are sent in groups of 8 samples over 1.5 Gb/s
@ -91,13 +91,13 @@ class Phaser:
attenuators and are available on the front panel. The odd outputs are
available at MMCX connectors on board.
In the upconverter variant, each of the two IQ (in-phase and quadrature)
output pairs feeds a one quadrature upconverter with integrated PLL/VCO.
This analog quadrature upconverter supports offset tuning for carrier and
sideband suppression. The output from the upconverter passes through the
31.5 dB range step attenuator and is available at the front panel.
In the upconverter variant, each IQ output pair feeds a one quadrature
upconverter with integrated PLL/VCO. This analog quadrature upconverter
supports offset tuning for carrier and sideband suppression. The output
from the upconverter passes through the 31.5 dB range step attenuator and
is available at the front panel.
The DAC, the analog quadrature upconverters and the two attenuators are
The DAC, the analog quadrature upconverters and the attenuators are
configured through a shared SPI bus that is accessed and controlled via
FPGA registers.
@ -373,7 +373,8 @@ class PhaserChannel:
The data is split accross multiple registers and thus the data
is only valid if constant.
:return: DAC data as 32 bit IQ. I in the 16 LSB, Q in the 16 MSB
:return: DAC data as 32 bit IQ. I/DACA/DACC in the 16 LSB,
Q/DACB/DACD in the 16 MSB
"""
return self.phaser.read32(PHASER_ADDR_DAC0_DATA + (self.index << 4))
@ -381,7 +382,8 @@ class PhaserChannel:
def set_dac_test(self, data: TInt32):
"""Set the DAC test data.
:param data: 32 bit IQ test data, I in the 16 LSB, Q in the 16 MSB
:param data: 32 bit IQ test data, I/DACA/DACC in the 16 LSB,
Q/DACB/DACD in the 16 MSB
"""
self.phaser.write32(PHASER_ADDR_DAC0_TEST + (self.index << 4), data)