Precision Measurement of Pixel Sensor Capacitance

H. Krüger; E. Kimmerle

doi:10.1088/1748-0221/16/01/p01029

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arXiv · 2010.03267

Precision Measurement of Pixel Sensor Capacitance

H. Krüger·E. Kimmerle

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Abstract

The capacitance of the charge collection node of a sensor system is an important parameter for the design of the analog front-end electronics. The analog front-end of high-granularity sensors like for example hybrid pixel detectors need to be optimized for timing resolution, power consumption, and electronics noise - parameters which all depend on the pixel capacitance. Current pixel detector developments for the HL-LHC upgrade typically use silicon sensors with a pixel size in the order of $50 \times 50 um^2$ which have a pixel capacitance of several tens of fF, depending on the sensor geometry. We have developed a dedicated integrated circuit to be bump-bonded to a pixel sensor, which enables a precise pixel capacitance measurement by using charge-based capacitance measurement method. In this paper, we will describe the measurement method and the implementation of the capacitance measurement chip (Pixcap65) and show measurement results of a planar pixel sensor whose pixel capacitance is influenced by variations of the implant geometry.

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BibTeX RIS

H. Krüger, E. Kimmerle. 2020-10-07. Precision Measurement of Pixel Sensor Capacitance. https://doi.org/10.1088/1748-0221/16/01/p01029

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