Front-end hybrid designs for the CMS Phase-2 Upgrade towards the production phase

Abstract

Sixteen thousand 2S front-end hybrids and twelve thousand PS front-end hybrids will be produced for the CMS Tracker Phase-2 upgrade. The hybrids consist of flip-chips, passives and mechanical components mounted on a flexible substrate, laminated onto carbon-fibre stiffeners with thermal expansion compensators. In the prototyping phase, several critical issues have been solved to manufacture these complex circuits. Final designs are now reaching readiness for the full-scale production. Lessons learned during the prototyping phase and different improvements implemented for manufacturability will be presented in this contribution.

CMS Outer Tracker Phase-2 Upgrade on-module powering

“…Two module types (2S and PS) will be used in the OT (figure 1). The 2S modules contain a double strip sensor configuration with an active area of (10 × 10) cm 2 , wire-bonded to two front-end hybrids (FEH) [2] that are powered and controlled by a service hybrid (SEH) [3]. The PS modules contain a macro-pixel sensor bump-bonded to 16 readout application-specific integrated circuits (ASICs) and a strip sensor, both with a size of (5 × 10) cm 2 .…”

“…The 2S modules contain a double strip sensor configuration with an active area of (10 × 10) cm 2 , wire-bonded to two front-end hybrids (FEH) [2] that are powered and controlled by a service hybrid (SEH) [3]. The PS modules contain a macro-pixel sensor bump-bonded to 16 readout application-specific integrated circuits (ASICs) and a strip sensor, both with a size of (5 × 10) cm 2 . Wire-bonds connect the macro-pixel ASICs and the strip sensor to two FEHs interconnected with a power hybrid (POH) on one side and with an optical readout hybrid (ROH) on the opposite side.…”

Commissioning of the test system for PS and 2S hybrids for the Phase-2 Upgrade of the CMS Outer Tracker

“…• Short and open finder procedures, which use antenna injections [5] to verify the silicon sensors input lines. Utilized by the Front-end hybrid [6] (FEH) TC (figure 2). • High voltage circuits and filters -2 -…”

CMS Outer Tracker Phase-2 Upgrade module noise and mitigation

“…Two module types (2S and PS) will be used in the CMS OT Phase-2 Upgrade. The 2S modules contain a double strip sensor configuration with an active area of (10 × 10) cm 2 , wirebonded to two front-end hybrids (FEH) [2] that are powered and controlled by a service hybrid (SEH) (Fig. 1) [3].…”

“…to two front-end hybrids (FEH) [2] that are powered and controlled by a service hybrid (SEH) (figure 1) [3]. The PS modules contain a strip sensor and a macro-pixel sensor of (5 × 10) cm 2 wire-bonded to two FEHs interconnected with a power hybrid (POH) on one side and with an optical readout hybrid (ROH) on the opposite side (figure 1).…”