Products | February 18, 2021
X-FAB Makes Major Enhancements to its 180 nm APD and SPAD Devices
X-FAB Silicon Foundries, the specialty foundry for analog/mixed-signal and optoelectronic solutions, has just introduced its latest generation of avalanche photodiode (APD) and single-photon avalanche diode (SPAD) devices.
This is a product release announcement by X-FAB. The issuer is solely responsible for its content.
Leveraging its proven automotive-qualified 180 nm XH018 high-voltage process, X-FAB’s new APDs and SPADs benefit from innovative architectural modifications, with substantial improvements in performance exhibited compared with the company’s earlier devices (which were initially announced back in mid-2019). Consequently, they can be used in situations where there are light level challenges involved. However, footprint compatibility with the previous generation has been retained. This means that a simple and convenient upgrade path is assured, with no additional engineering work being required. One of the areas in which the boost in performance is most noticeable is in relation to the photon detection probability (PDP). There is a 42% PDP figure for incident light at 405 nm, while further up the spectrum in the near-infrared (NIR) frequencies the improvement is as much as 150%, with a 5% PDP being demonstrated at 850 nm. An afterpulsing probability of 0.9% has been achieved which represents a 70% reduction compared to the first-generation devices. The dark count rate (DCR) is only 13 counts/s/µm². The fill factor (the percentage of these sensors’ surface area that is active) which can now be supported has almost doubled – reaching 33%. As breakdown voltage characteristics can vary from device to device, an exact determination is necessary to ensure that good APD/SPAD performance is maintained. For this reason, X-FAB has incorporated a trigger diode – which allows precise, real-time on-chip breakdown voltage detection without an external light source. Active quenching circuitry is included, through which the rate at which the SPAD devices recover can be accelerated, allowing them to be made ready for further light detection. The new SPADs offer better application adaptation due to their size flexibility (in terms of both width and length). First-time-right design is supported by complete device models for the SPAD and APD devices. The behavior of the new built-in trigger diodes is included in the model. “Thanks to the combination of elevated PDP and competitive DCR levels, we are presenting the market with APD/SPAD solutions that have impressive signal integrity characteristics, which will directly benefit our customers for applications like computer tomography and fluorescence detection within the medical sector, as well for time-of-flight and LiDAR in industrial and automotive systems,” states Detlef Sommer, Business Line Manager for Opto Technologies at X-FAB. “These advanced optoelectronic elements are valuable additions to the X-FAB design kit, broadening the selection of interoperable assets based on the XH018 process that can be made use of.”
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