Performance of SPIROC chips in SKIROC mode

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Presentation transcript:

Performance of SPIROC chips in SKIROC mode Michele Faucci Giannelli, Jérémy Rouene, Vincent Vandenbussche

Outline Test bench description Tests on two SPIROC2 chips: ADC Gaussian response ADC linearity and stability tests Bond gap measurement and correction Noise level and stability Tests on SPIROC1 chips: Preamplifier linearity Fast shaper linearity Conclusions

Test bench setup Power pulse generator Voltmeters Power supply Test board with SPIROC2 chip Laptop with LabView

Test bench setup Power supply Input signal USB connection Ext. trigger ALTERA chip SPIROC2 chip Band gap monitor

ADC test This scheme is repeated for 16 channels SIGNAL OFF

Gaussian form Generator from 1.2V to 2.4V with 0.2V steps 32000 entries per step per channel The response is not perfectly Gaussian ( c2/ndf = 200/6) due to a small asymmetry

Linearity test Generator parameters: 10 runs per step from 1.2V to 2.5V 250 mV steps 10 runs per step 16 measurement (depth of memory) per run All 36 channels received the same input Long time measurement may be affected by instability of the chip Automated routine Analysis in ROOT

Result and fit All 36 channels are plotted and fitted

Residuals and RMS Residuals No major problems Some instabilities in the residuals Range +-1 ADC counts RMS Spikes are due to known issues with the acquisition (see later) Problem not present when using faster computer.

Comparison of 3 voltages The shift between channels is constant as function of the voltage The RMS are not correlated in the same channel at different voltages

Stability measurement Preliminary 50h measurement without control on band gap Then a 20h measurement two voltages Monitored both the generator voltages and the band gap value Measured performed during weekend (no people in the room) and with air conditioning to stabilize the temperature Band gap correlated with ADC output in order to characterize its effect

Stability Problem with band gap caused an drift of 8 ADC counts Once the band gap was fixed the drift was reduced to 3 ADC counts in 20 hours Periodicity observed in both ADC and generator output, maybe due to air conditioning turning on and off

Band gap correlated with ADC output Band gap correlation Band gap correlated with ADC output The points were fitted with a linear function to correct the linearity measurement

Corrected linearity Correcting the points using the BG information and the function obtained before The residual reduced from ±1 to ±0.5 ADC counts Non corrected Band gap corrected CH 1 CH 8

Noise measurement Electronics in front of ADC is activated and ADC output measured Similar to noise measurement ON

Similar level of noise in the two chips Noise level Similar level of noise in the two chips No correlation between the two chips, hence the noise is not correlated to the chip design

Noise level RMS of noise Clear problem in channel 32 High number of 0s increase the RMS dramatically, the problem is due to lag in communication with laptop The RMS is normal once the 0s are removed

Measurements on SPIROC1 Simpler setup than before no automated measurement Signal injected manually varying input charge or internal gain On SPIROC1 it is possible to probe internal points in the chip the signal after each component is measured at the oscilloscope Study of pre-amplifier, fast shaper and slow shaper raise time, length, value of maximum focus on fast shaper

Linearity of fast shaper Gain is fixed (200fF) Value and time of maximum of the output from FS as function of injected charge Ch4 Ch17 The FS is linear up to 100 fC The time response is logarithmic for a larger range

Fast shaper Now fixed charge (100fC) Same measurements changing internal gain Ch4 Ch17 Expected 1/gain behavior in both for both maximum and the time at which it is reached

Conclusion and outlook Important experience for future performance studies ADC is working correctly once connected to fast pc and BG is monitored Need to test in power pulsing mode Band gap need to be stabilised The full acquisition with SPIROC2 chip still need some debugging difficult due to lack of internal probe More test will be performed on analog part of the chip to fully characterise all components

Backup Slides

Gaussianess of signal When changing voltage, a small tail appears Larger for channels with higher mean Identical for both channels!!! Not at all voltages