Precision Measurement of Pixel Sensor Capacitance
H. Kr\"uger, E. Kimmerle

TL;DR
This paper presents a new integrated circuit for precise pixel capacitance measurement in high-granularity sensors, aiding the optimization of front-end electronics for applications like the HL-LHC upgrade.
Contribution
Development of a dedicated capacitance measurement chip (Pixcap65) and a charge-based method for accurate pixel capacitance evaluation.
Findings
Measurement of pixel capacitance influenced by implant geometry variations.
Implementation of a charge-based capacitance measurement method.
Successful demonstration on a planar pixel sensor.
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 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…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
