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- Toward a Gigatracker Front-end - Performance of the NINO LCO and HCO. Matthieu Despeisse F. Osmic, S. Tiuraniemi, P. Jarron, P. Riedler. Electrical characterizations of NINO LCO. Laser Measurements :Data analysis w. induced signal calculations. NINO LCO + pre-amp.

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slide1

- Toward a Gigatracker Front-end -

Performance of the NINO LCO and HCO

Matthieu Despeisse

F. Osmic, S. Tiuraniemi,

P. Jarron, P. Riedler

slide2

Electrical characterizations of NINO LCO

Laser Measurements :Data analysis

w. induced signal calculations

NINO LCO + pre-amp

Characterization of the NINO HCO

OUTLINE

slide3

The 130 nm NINO test-ASIC

Integrated electronics :

- LCO, 3 channels

- HCO

NINO_v13: 1.4 mm × 1 mm

slide4

NINO LCO calibration

  • LCO optimized for 200 fF input capacitance
  • (Higher Cin degrades jitter + minimum threshold)

Calibration via a 1 pF injection capacitance OUTSIDE CHIP

Calibration via a 100 fF injection capacitance IN CHIP

corresponds to the expected performance in a hybrid pixel configuration of LCO

estimates what to expect from external measurements on this chip

Laser Measurements

on Silicon sensor pixel

Expected LCO

timing precision for hybrid detector

slide5

NINO LCO calibration

CALIBRATION w/ 100 fF injection capacitance

1 ns

Threshold @ 1.5 fC

slide6

NINO LCO calibration

CALIBRATION w/ 100 fF injection capacitance

Expected LCO global

timing precision

slide7

NINO LCO calibration

CALIBRATION w/ 1 pF injection capacitance

External TESTS

1 ns

slide8

NINO LCO calibration

CALIBRATION w/ 1 pF injection capacitance

External TESTS

Strong degradation of measured jitter compared to the 100 fF tests

slide9

NINO LCO calibration - Conclusion

  • LCO designed for 200 fF input capacitance
  • Higher Cin degrades jitter + minimum threshold

CALIBRATION w/ 1 pF injection capacitance

External TESTS

CALIBRATION w/ 100 fF injection capacitance

Laser Measurements

on Silicon sensor pixel

Expected LCO global

timing precision in the

Gigatracker application ?

Simulations

Data analysis

slide10

Electrical characterizations of NINO LCO

Laser Measurements : Data analysis

w. induced signal calculations

NINO LCO + pre-amp

Characterization of the NINO HCO

OUTLINE

slide11

Test set-up – Fadmar, Sakari

Silicon detector: 300 µm × 300 µm pixel, 200 µm thick sensor

Wire bond connection to a LCO channel

1060 nm pulsed Laser tests

Laser calibration – position done / Fadmar, Sakari

1 ns

slide12

Induced signal – simple calculations

Simple calculations based on 200 V detector bias

+ infinite parallel plate approximation

For a simultaneous generation

of e-/h+ pairs equally distributed

in the sensor thickness (MIP)

Ideal shape

slide13

Induced signal – simple calculations

Simple calculations based on 200 V detector bias

+ infinite parallel plate approximation

Taking into account the laser pulse shape

slide14

Induced signal – simple calculations

Simple calculations based on 200 V detector bias

+ infinite parallel plate approximation

Taking into account the laser pulse shape

slide15

1 ns

Tests results

Calculated signals + 1.2 pF total Cin give good fitting

measurements

1 ns

Simulations

w. calculated signals

slide16

NINO LCO SIMULATIONS w. calculated signals

Calculated signals + 1.2 pF total Cin give good fitting

Precise Jitter estimation

from simulations

measurements

measurements

Simulations

w. calculated signals

Simulations

w. calculated signals

slide17

NINO LCO SIMULATIONS w. calculated signals

CAPACITANCE INFLUENCE

sim. 1.2 pF

measurements

sim. 0.7 pF

measurements

sim. 0.7 pF

sim.

1.2 pF

sim. 0.3 pF

sim. 0.3 pF

slide18

NINO LCO SIMULATIONS w. calculated signals

CAPACITANCE INFLUENCE

Reducing the capa. reduces the pulse width and so the time walk variations

1 ns

Points simulated w. similar input signals

slide19

Measurements w. 100 fF injection

NINO LCO SIMULATIONS w. calculated signals

What we expect w. Ideal shape signals

Jitter estimation for the LCO connected via bump bonding to the sensor:

< 180 ps for Q > 1.5 fC

slide20

Electrical characterizations of NINO LCO

Laser Measurements :Data analysis

w. induced signal calculations

NINO LCO + pre-amp

Characterization of the NINO HCO

OUTLINE

slide21

Use of additionnal pre-amp for the Gigatracker pixel front end

NINO LCO SIMULATIONS w. pre-amp

Pre-amp

Under optimization

Ideal currents

1, 2, 3fC

LCO inputs

LCO outputs

slide22

Jitter performance (simulations)

NINO LCO SIMULATIONS w. calculated signals

Th @ 0.5 fC

Th @ 1 fC

Pre-amp

Under optimization

Jitter < 150 ps

for charges >= 0.8 fC

Th

@ 0.7 fC

slide23

Electrical characterizations of NINO LCO

Laser Measurements :Data analysis

w. induced signal calculations

Characterization of the NINO HCO

NINO LCO + pre-amp

OUTLINE

slide24

NINO HCO

HCO circuit optimized for few pF input capacitance

Tests via a 1 pF capacitance OUTSIDE CHIP, for a Rin ~ 75 Ω – Power ~ 4.5 mW / channel

Minimum charge @ 6 fC

Minimum charge @ 10 fC

Minimum charge @ 12.5 fC

slide25

NINO HCO

HCO circuit optimized for few pF input capacitance

Tests via a 1 pF capacitance OUTSIDE CHIP, for a Rin ~ 75 Ω – Power ~ 4.5 mW / channel

NB: Simulation technique for the jitter

shows good results on HCO too.

slide26

NINO LCO measurements - simulations

Pre-amp + LCO - simulations

HCO possible candidate for

end of column receiver

CONCLUSIONS

  • Showed that we can reach for a hybrid detector :
  • min. detectable charge of 1.5 fC @ 200 ps rms
  • jitter < 150 ps for charges > 2 fC
  • Showed that we can reach for a hybrid detector :
  • min. detectable charge of 0.5 fC @ 250 ps rms
  • jitter < 150 ps for charges > 0.8 fC

Measurements and simulations show < 20 ps rms

jitter for fast input signals w. charges > 10 fC

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