A QIS, or quanta image sensor, is an image-sensor concept that uses very small detector elements called jots and frames imaging in terms of counting photons. It is related to the established CMOS image sensor (CIS), but a May 2021 EE Times report on Gigajot’s early products does not establish QIS as a universal replacement for CMOS or confirm that its development kit is available today.
What do CIS and QIS mean?
CIS means CMOS image sensor, the familiar term for an image sensor built using complementary metal-oxide-semiconductor technology. QIS means quanta image sensor. EE Times described QIS as an evolution—or possibly a revolution—of CMOS imaging, but that phrasing is a characterization, not proof of a settled industry-wide successor standard.
The distinguishing term in the report is jot: a very small detector element. QIS describes an approach to imaging centered on such elements and photon-counting. The article does not establish that every QIS implementation uses an identical design, or provide a full technical comparison with conventional CMOS sensors.
How does a QIS differ from a conventional CMOS image sensor?
The most concrete distinction in the 2021 account is conceptual: it describes QIS in terms of small jots and photon counting, rather than offering a side-by-side evaluation of commercial sensor models. A paper title cited by EE Times reports particular noise and dynamic-range figures, but those numbers belong to the named paper, not to every QIS sensor or to a camera kit as a product specification.
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| Comparison point | What the May 2021 EE Times report says | What it does not establish |
|---|---|---|
| Terminology | QIS expands to “quanta image sensor”; the report calls the very small detector element a “jot.” | A universal design shared by all QIS implementations. |
| Imaging framing | The article presents QIS as photon-counting imaging. | A measured image-quality advantage over conventional CMOS sensors in general use. |
| Reported technical figures | A VLSI Symposium paper title reports 0.3e- read noise and 100 dB single-exposure dynamic range for a 4-megapixel stacked backside-illuminated QIS. | Independent validation by EE Times, or proof that these figures describe a retail camera kit. |
| Product availability | The article shows a QIS camera development kit and says Gigajot had announced its first products. | Current stock, price, sales channel, or present-day specifications. |
What did Gigajot announce?
EE Times reported in May 2021 that Gigajot had recently announced its first products and showed an image captioned “QIS camera development kit (source: Gigajot).” That makes “QIS camera development kit” a useful name for the item described in that report; it does not confirm whether the kit can be bought now.
The article says Gigajot intended the products for high-performance imaging in scientific, medical, defense, industrial, and space applications. Those are stated target fields, not evidence of certification, suitability for a specific clinical or defense use, or demonstrated performance in every setting.
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What are the reported QIS performance figures?
EE Times cited the title of a forthcoming VLSI Symposium paper: “A Photon-Counting 4Mpixel Stacked BSI Quanta Image Sensor with 0.3e- Read Noise and 100dB Single-Exposure Dynamic Range.” The 0.3e- read-noise and 100 dB dynamic-range values should be read as figures reported in that paper title. EE Times’ report does not independently verify the experimental methods, and the title does not establish that the figures apply to Gigajot’s camera development kit.
The article also refers to a 2017 paper about a backside-illuminated sensor die stacked with a readout chip and using a pump-gate jot. The report does not provide complete bibliographic details for that paper, so it is not possible to identify it fully from the account alone.
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Who developed QIS, and what does “first” mean here?
According to the May 2021 EE Times article, Gigajot was founded in 2017 as a spin-off from Dartmouth College’s Thayer School of Engineering. Its co-founders, Saleh Masoodian and Jiaju Ma, were researchers there and had been developing QIS before the company was founded. Imaging researcher Eric R. Fossum, described as a company advisor, mentored the founders.
The headline “Meet the First QIS” is EE Times’ journalistic framing. The article does not define the scope of “first” or establish that Gigajot created the first example of every possible kind of QIS, so the phrase should not be treated as a universal priority claim.
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Why does the article connect QIS to CMOS history?
EE Times places QIS in the longer story of CMOS image sensors. It traces early CIS development through work at NASA’s Jet Propulsion Laboratory, where lighter, more power-efficient solid-state cameras were valuable for spacecraft, and mentions Photobit’s commercial development and later acquisition history. This is selective background, not a complete history of CMOS imaging.
The report also reproduces remarks by Fossum. In a 2018 DP Review interview, he said of binary response, “Because it’s binary in nature, its response is comparable to old photographic film.” In a 2008 presentation, he said, “If you can’t fix it, feature it.” The EE Times article uses the latter in discussing the jot name and its marketing. Fossum also described digital imaging as a collective effort: “Where it is today is the result of the input from thousands of engineers from different companies who’ve contributed towards where we are now.” These quotations are reproduced by the 2021 article; their fuller original context is not established there.
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What can you conclude from the 2021 report?
- QIS names an approach to imaging built around very small detector elements called jots and a photon-counting framing.
- Gigajot had announced products and a camera development kit by the time EE Times published its report in May 2021.
- The paper-title figures are specific reported research claims, not independently confirmed specifications for a kit.
- The report does not settle current product availability, present-day specifications, comparative image quality, price, or adoption.
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