A novel source-drain follower for monolithic active pixel sensors
Monolithic active pixel sensors (MAPS) receive interest in tracking applications in high energy physics as they integrate sensor and readout electronics in one silicon die with potential for lower material budget and cost, and better performance. Source followers (SFs) are widely used for MAPS reado...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
28 March 2016
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| In: |
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
Year: 2016, Volume: 831, Pages: 147-155 |
| ISSN: | 1872-9576 |
| DOI: | 10.1016/j.nima.2016.03.074 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.nima.2016.03.074 Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0168900216300985 
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| Author Notes: | C. Gao, G. Aglieri, H. Hillemanns, G. Huang, A. Junique, M. Keil, D. Kim, M. Kofarago, T. Kugathasan, M. Mager, C.A. Marin Tobon, P. Martinengo, H. Mugnier, L. Musa, S. Lee, F. Reidt, P. Riedler, J. Rousset, K.M. Sielewicz, W. Snoeys, X. Sun, J.W. Van Hoorne, P. Yang |
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| 245 | 1 | 2 | |a A novel source-drain follower for monolithic active pixel sensors |c C. Gao, G. Aglieri, H. Hillemanns, G. Huang, A. Junique, M. Keil, D. Kim, M. Kofarago, T. Kugathasan, M. Mager, C.A. Marin Tobon, P. Martinengo, H. Mugnier, L. Musa, S. Lee, F. Reidt, P. Riedler, J. Rousset, K.M. Sielewicz, W. Snoeys, X. Sun, J.W. Van Hoorne, P. Yang |
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| 520 | |a Monolithic active pixel sensors (MAPS) receive interest in tracking applications in high energy physics as they integrate sensor and readout electronics in one silicon die with potential for lower material budget and cost, and better performance. Source followers (SFs) are widely used for MAPS readout: they increase charge conversion gain 1/Ceff or decrease the effective sensing node capacitance Ceff because the follower action compensates part of the input capacitance. Charge conversion gain is critical for analog power consumption and therefore for material budget in tracking applications, and also has direct system impact. This paper presents a novel source-drain follower (SDF), where both source and drain follow the gate potential improving charge conversion gain. For the inner tracking system (ITS) upgrade of the ALICE experiment at CERN, low material budget is a primary requirement. The SDF circuit was studied as part of the effort to optimize the effective capacitance of the sensing node. The collection electrode, input transistor and routing metal all contribute to Ceff. Reverse sensor bias reduces the collection electrode capacitance. The novel SDF circuit eliminates the contribution of the input transistor to Ceff, reduces the routing contribution if additional shielding is introduced, provides a way to estimate the capacitance of the sensor itself, and has a voltage gain closer to unity than the standard SF. The SDF circuit has a somewhat larger area with a somewhat smaller bandwidth, but this is acceptable in most cases. A test chip, manufactured in a 180nm CMOS image sensor process, implements small prototype pixel matrices in different flavors to compare the standard SF to the novel SF and to the novel SF with additional shielding. The effective sensing node capacitance was measured using a 55Fe source. Increasing reverse substrate bias from −1V to −6V reduces Ceff by 38% and the equivalent noise charge (ENC) by 22% for the standard SF. The SDF provides a further 9% improvement for Ceff and 25% for ENC. The SDF circuit with additional shielding provides 18% improvement for Ceff, and combined with −6V reverse bias yields almost a factor 2. | ||
| 650 | 4 | |a Low-power charge sensitive amplifier | |
| 650 | 4 | |a MAPS | |
| 650 | 4 | |a Sensor capacitance | |
| 650 | 4 | |a Source follower | |
| 650 | 4 | |a Source-drain follower | |
| 700 | 1 | |a Aglieri, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Hillemanns, H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Huang, G. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Junique, A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Keil, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kim, D. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kofarago, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Kugathasan, T. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Mager, M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Marin Tobon, C. A. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Martinengo, P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Mugnier, H. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Musa, L. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Lee, S. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Reidt, Felix |e VerfasserIn |0 (DE-588)1100572090 |0 (DE-627)859480321 |0 (DE-576)469721235 |4 aut | |
| 700 | 1 | |a Riedler, P. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rousset, J. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sielewicz, K. M. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Snoeys, W. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Sun, X. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Van Hoorne, J. W. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Yang, P. |e VerfasserIn |4 aut | |
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