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Task Outcome Summary

Abstract

In this task, diagnostic data is collected during 160um, 70um, and 24um thermal anneals. The anneals executed properly. The temperature plots from these anneals are presented in the report for metatask MIPS-2050. Following the anneals, a Vrst optimization is performed on the Ge arrays. The results are presented below.

Analysis

We converted the diagnostic data from the thermal anneal into temperatures and generated temperature plots. These data are compared to the temperature curves from previous anneals. See the writeup for MIPS-2050 for details.

A Vrst analysis was performed on the Vrst data. In this test, the bias voltages for the 70um and 160um arrays are set to 0 mV, and then the Vrst voltages are adjusted between +5 mV and -5 mV relative to normal. A bright stim is turned on in manual mode during the test. The principle is that the array will produce a strong positive slope when positively biased and a strong negative slope when negatively biased, so the zero bias voltage point can be easily recognized. In practice, we calculate slope images and then look for this transition point.


Results

Temperature Plots from Anneal

The temperature plots can be seen in the writeup for MIPS-2050. The temperature behavior during the anneal was nominal.

Vrst Optimization

The Vrst data are presented below. The filenames are MIPS.2/3.0007642880.00??.0001.01.mipl.fits. 

File Bias 70_1  70_2  70_3  70_4  70_5  70_6  70_7  70_8 160_1 160_2 160_3 160_4
02   Nom  -50   -90  -130  -200  -220  -210  -180  -200    -2  -141   -43    -4
03   +5  -230  -250  -330  -310  -360  -280  -340  -260  -444  -685  -321  -327
04   +4  -150  -140  -210  -240  -270  -250  -270  -240  -461  -600  -278  -218
05   +3  -100  -110  -150  -190  -220  -230  -200  -190  -338  -250  -223  -151
06   +2   -60   -80  -110  -130  -180  -190  -170  -160  -174  -305  -136   -72
07   +1   -20     0   -70   -90  -120  -160  -140  -140   -27  -181  -102   -33
08   Nom   40    50    30   -70  -100  -130  -100  -100   142   -84    33    30
09   -1    70   100    20   -40   -80   -90   -70   -70   305   -35   105    87
10   -2    90   150    40     0   -70   -50   -60   -60   495    95   196   153
11   -3   140   180    80    30   -20   -30   -40   -40   696   199   318   239
12   -4   180   190   120    70    20     0    20   -20   920   321   423   595
13   -5   210   230   170   100    80    60    30     0  1174   452   562   464
14   Nom  -60   -90  -120  -200  -270  -230  -260  -210    94   -63    42    37

Vrst     +0.75 +1.0  -1.0  -2.0  -3.5  -4.0  -4.0  -5.0  +0.5  -1.0   0.0  +0.5
DAC Counts +3    +4    -4    -8   -14   -16   -16   -20    +2    -4     0    +2
DAC NOM   90E   8F7   910   8E7   916   90B   920   905   97D   91C   91C   913
New DAC   911   8FB   90C   8DF   908   8FB   910   8F1   97F   918   91C   915

CampJ_NOM 911   8FB   910   8E0   90C   8FF   912   8F3   97E   918   91C   915

The Vrst values from this campaign are very similar to the new defaults that were added to the mips-irs patch block following campaign I. The only place where large differences are seen is on side B of the 70um array, where the Vrst values are systematically changed by 0.5-1.0 mV. This variation in nominal Vrst value is likely related to the Vcasn problem. No new updates are recommended at this time.

Conclusions

The thermal behavior of the arrays is nominal. The Vrst behavior is very consistent with the previous two campaigns with the exception of side B on the 70um array. No changes are recommended at this time.

Output and Deliverable Products

None.

Actions Following Analysis

None.