- Toward a Gigatracker Front-end - Performance of the NINO LCO and HCO

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M. Despeisse / 29th January 2008 - 1 -

- Toward a Gigatracker Front-end -

Performance of the NINO LCO and HCO

Matthieu DespeisseF. Osmic, S. Tiuraniemi,

P. Jarron, P. Riedler

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OUTLINE

Laser Measurements :Data analysis w. induced signal calculations

NINO LCO + pre-amp

Electrical characterizations of NINO LCO

Characterization of the NINO HCO

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LCO channel

180 m

35 m

The 130 nm NINO test-ASIC

Integrated electronics : - LCO, 3 channels

HCO channel

260 m

130 m

- HCO

NINO_v13: 1.4 mm × 1 mm

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NINO LCO calibration

Expected LCOtiming precision for hybrid detector

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

corresponds to the expected performance in a hybrid pixel

configuration of LCO

estimates what to expect from external measurements on this chip

Laser Measurementson Silicon sensor pixel

Calibration via a 100 fF injection capacitance IN CHIP

Calibration via a 1 pF injection capacitance OUTSIDE CHIP

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Threshold @ 1.5 fC

1 ns

CALIBRATION w/ 100 fF injection capacitance

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Expected LCO global timing precision


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1 ns

CALIBRATION w/ 1 pF injection capacitanceExternal TESTS

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Strong degradation of measured jitter compared to the 100 fF tests

CALIBRATION w/ 1 pF injection capacitanceExternal TESTS

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NINO LCO calibration - Conclusion

Expected LCO global timing precision in the

Gigatracker application ?

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

Laser Measurementson Silicon sensor pixel

CALIBRATION w/ 1 pF injection capacitance

External TESTS


SimulationsData analysis

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M. Despeisse / 29th January 2008 - 10

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OUTLINE

Laser Measurements : Data analysis w. induced signal calculations

NINO LCO + pre-amp



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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 testsLaser calibration – position done / Fadmar, Sakari

Laser Pulse Shapes

-0.005

0

0.005

0.01

0.015

0.02

0.025

0.03

0.035

4.80E+01 4.90E+01 5.00E+01 5.10E+01 5.20E+01 5.30E+01 5.40E+01 5.50E+01 5.60E+01

time [ns]

am

pl [V

]

1.55 V

1.60 V

1.65 V

1.70 V

1.75 V

1.80 V

1.85 V

1.90 V

1.95 V

2.00 V

1 ns

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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

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Taking into account the laser pulse shape

Laser Pulse Shapes

-0.005

0

0.005

0.01

0.015

0.02

0.025

0.03

0.035

4.80E+01 4.90E+01 5.00E+01 5.10E+01 5.20E+01 5.30E+01 5.40E+01 5.50E+01 5.60E+01

time [ns]

ampl

[V]

1.55 V

1.60 V

1.65 V

1.70 V

1.75 V

1.80 V

1.85 V

1.90 V

1.95 V

2.00 V

1 ns

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measurements

Simulations w. calculated signals

Tests results

1 ns1 ns

Calculated signals + 1.2 pF total Cin give good fitting

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measurements



measurements

Calculated signals + 1.2 pF total Cin give good fitting

NINO LCO SIMULATIONS w. calculated signals

Precise Jitter estimation from simulations

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measurements

measurements

sim. 1.2 pF

sim. 0.7 pF

sim. 0.3 pFsim.

1.2 pF

sim. 0.7 pF

sim. 0.3 pF

CAPACITANCE INFLUENCE


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CAPACITANCE INFLUENCE

Points simulated w. similar input signals

Reducing the capa. reduces the pulse width

and so the time walk variations


1 ns

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What we expect w. Ideal shape signals


Measurements w. 100 fF injection

Jitter estimation for the LCO connected via bump

bonding to the sensor:< 180 ps for Q > 1.5 fC

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OUTLINE


NINO LCO + pre-amp



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NINO LCO SIMULATIONS w. pre-amp

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

Ideal currents

LCO inputs

LCO outputs

1, 2, 3 fC

Pre-ampUnder optimization

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Jitter performance (simulations)

Th @ 1 fC

Th @ 0.7 fC

Th @ 0.5 fC

Jitter < 150 ps for charges >= 0.8 fC

Pre-ampUnder optimization

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OUTLINE


NINO LCO + pre-amp



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NINO HCO

HCO circuit optimized for few pF input capacitanceTests 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

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NINO HCO

HCO circuit optimized for few pF input capacitanceTests 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.

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CONCLUSIONS

NINO LCO measurements - simulationsShowed 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

Pre-amp + LCO - simulationsShowed 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

HCO possible candidate for end of column receiver

Measurements and simulations show < 20 ps rms jitter for fast input signals w. charges > 10 fC

- Toward a Gigatracker Front-end - Performance of the NINO LCO and HCO

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Transcript of - Toward a Gigatracker Front-end - Performance of the NINO LCO and HCO