Time-Delayed Integration or TDI in CMOS seems to be a hot topic (at least for space applications), but it also still is a challenging architecture to build in CMOS technology.\u00a0 At the CNES CMOS image sensor workshop in Toulouse (held about 10 days ago), there were several presentations on CMOS-TDI, here is an overview.<\/p>\n
C. Virmentois presented the CNES work on TDI.\u00a0 They finished several projects with ESPROS (CCD on CMOS), IMEC (CCD on CMOS) and ST (digital CMOS TDI).\u00a0 At this moment work is going on in the field of a multi-spectral TDI with large pixels, also this latest device is based on a digital TDI.<\/p>\n
W.r.t. to the chip(s) made at ESPROS, the following details were given :<\/p>\n
A second chip made at ESPROS showed improved results, such as :<\/p>\n
During the presentation it was not mentioned which part of the processing was done by ESPROS and\/or which part of the processing was done by a third party.<\/p>\n
<\/p>\n
M.-Y. Yeh of NAR Labs reported the work on TDI done in his lab :<\/p>\n
<\/p>\n
F. Mayer of e2v mentioned that the first TDI made by his company was already done in 2010 with charge transfer in a 0.18 um CMOS process.\u00a0 Later more CCD-like devices were made.<\/p>\n
For the digital domain, Frederic mentions :<\/p>\n
For the charge domain :<\/p>\n
The combination of digital and charge domain can overcome a number of drawbacks, but the architecture will be pretty complex.<\/p>\n
The first generation charge transfer TDI was built on a surface channel CCD, the second generation was provided with a buried channel.<\/p>\n
Neither in this presentation the fab was mentioned that fabricated the CMOS wafers.<\/p>\n
<\/p>\n
Ben-Ari of SemiConductors Devices gave a large list of performance data of the TDI\u2019s made by his company.<\/p>\n
In summary :<\/p>\n
Current status of these devices : BSI delivered, wafer sort done with good yield.<\/p>\n
<\/p>\n
Boulenc gave an overview of IMEC\u2019s TDI status :<\/p>\n
<\/p>\n
In conclusion : a lot of interesting work is going on in the field of TDI-CMOS, but apparently none of the developments has yet resulted in commercially available devices with a performance that matches the existing TDI-CCD performance.\u00a0 It is more difficult than expected to beat the TDI-CCD noise-free charge transfer in sub-pixel steps in combination with a low dark current.\u00a0 Depending on which side of the table you are sitting, this can be bad news (for the customers eagerly waiting for TDI-CMOS) or this can be good news (for the engineers, because there are still enough challenging developments ahead of us).<\/p>\n
Albert, 26-11-2015.<\/p>\n","protected":false},"excerpt":{"rendered":"
Time-Delayed Integration or TDI in CMOS seems to be a hot topic (at least for space applications), but it also still is a challenging architecture to build in CMOS technology.\u00a0 At the CNES CMOS image sensor workshop in Toulouse (held about 10 days ago), there were several presentations on CMOS-TDI, here is an overview. C. […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1509","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1509","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1509"}],"version-history":[{"count":2,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1509\/revisions"}],"predecessor-version":[{"id":1511,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/1509\/revisions\/1511"}],"wp:attachment":[{"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1509"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1509"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/harvestimaging.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1509"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}