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UMUX 5 » History » Version 10

Version 9 (Chris Stoughton, 12/06/2019 04:04 PM) → Version 10/15 (Chris Stoughton, 12/06/2019 04:38 PM)

h1. UMUX 5

h2. 2019-12-02

Resonances seem be be between 5.2 to 5.4 GHz. Here is a photo of the network analyzer
!>{width:60%}umux5-network-analyzer-2019-12-02.jpg!

Found 22 clear resonances using qtTools.findresonances

Phasestream shows a strange pattern in many channels.

!phasestream1202.png!

Tried flux ramp, cannot see the fluxramp in the phase stream.

h2. 12-05-2019

Some signs of flux ramp signal from umux, but strange.
!Screenshot%20from%202019-12-05%2016-25-19.png!

above plot is for a flux a ramp input at 100Hz, a saw tooth wave 0-2.5V with 100% duty cycle.

!Screenshot%20from%202019-12-05%2016-28-13.png!

Increased the flux ramp input to 0-4V, see something like the flux ramp, but with a lot of noise.

!Screenshot%20from%202019-12-05%2016-30-18.png!

When the flux ramp input increased to -5V it disappears.

!Screenshot%20from%202019-12-05%2016-33-35.png!

Lowered the flux ramp input back to -4V, Connected the signal cable from channel 2 of the pulse generator. (output turned off). See a distorted flux ram like signal.

!Screenshot%20from%202019-12-05%2016-37-05.png!

fluxramp 0-3V. Signal is still turned off.

!Screenshot%20from%202019-12-05%2016-38-20.png!

flux ramp input 0-1V. Signal still turned off.

h2. 2019-12-06

We repeated the study, and see similar results, making sure to rotate and translate. This is also done with 50 Ohm terminators on both inputs.

!ch0-phases.png!
Here is the time stream of phases

!ch0-terminated-inputs.png!
Power spectrum of phases, zoomed in around a few hundred Hz. The first peak is 125 Hz.

h3. Capturing many phases

We ran streamToRamDisk for a few minutes and copied data to /home/stoughto/2019-12-06-umux5 and plotted phases for different channels. The variation seems to be correlated.

!phasesInTwoChannels.png!