A 25 fps 32 × 24 Digital CMOS Terahertz Image Sensor

Fang, Tong; Dou, Runjiang; Liu, Liyuan; Liu, Jian; Wu, Nanjian

doi:10.1109/asscc.2018.8579336

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…On the shifting beam spot, realtime capturing of the shift to the right direction is performed and its position is displayed in the image sequence. Table 1 compares our work with recently reported antenna type CMOS terahertz imager [4][5][6][7][8]. Almost all imagers use MOSFET rectifier in 65 nm or 130 nm CMOS process.…”

Section: Fig6 Measurement Environmentmentioning

confidence: 99%

“…Sensors RFIT ASSCC ISSCC 2016 [4] 2017 [6] 2018 [7] 2021 [ The ratio of "PIX" is larger than that of "TIU", due to the problem of simulation accuracy. Performing Monte Carlo sampling with 8000 samples, the ratio goes down to 0.972 (THz_OFF) and 0.987 (THz_ON).…”

Section: Mismatch Variationsmentioning

confidence: 99%

“…However, there has been little discussion about variation correction methods for pixel arrays. Recently, many CMOS terahertz imagers have been proposed [4][5][6][7][8]. In order to suppress the manufacturing variations (MOSFETs threshold voltage variations), both offset and gain variations must be compensated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pixel Variation Characteristics of a Global Shutter THz Imager and its Calibration Technique

Kanazawa

Ambalathankandy

Ikebe

2023

IEICE Trans. Fundamentals

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We have developed a Si-CMOS terahertz image sensor to address the paucity of low-cost terahertz detectors. Our imaging pixel directly connects to a VCO-based ADC and achieves pixel parallel ADC architecture for high-speed global shutter THz imaging. In this paper, we propose a digital calibration technique for offset and gain variation of each pixel using global shutter operation. The calibration technique gives reference signal to all pixels simultaneously and takes reference frames as a part of the high-speed image captures. Using this technique, we achieve offset/non-linear gain variation suppression of 85.7% compared to without correction.

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Section: Fig6 Measurement Environmentmentioning

confidence: 99%

Section: Mismatch Variationsmentioning

confidence: 99%

See 1 more Smart Citation

Pixel Variation Characteristics of a Global Shutter THz Imager and its Calibration Technique

Kanazawa

Ambalathankandy

Ikebe

2023

IEICE Trans. Fundamentals

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“…A beam power of 5 mW is measured by a free-space absolute power meter (from 3A-P-THz). The normalized voltage responsivity R v of the CIS can be expressed as [12,14]…”

Section: Cis Performancementioning

confidence: 99%

“…Unlike the traditional definition of a CIS-detector NEP [14,38,39] , we use the ratio of the root-mean-square (RMS) noise voltage U noise to the voltage responsivity R v as the CIS's noise figure-of-merit (FOM) [12,40] . That is,…”

Section: Cis Performancementioning

confidence: 99%

Exploration of high-speed 3.0 THz imaging with a 65 nm CMOS process

Liu,

Cai,

Liu

et al. 2023

J. Semicond.

Self Cite

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This paper describes a promising route for the exploration and development of 3.0 THz sensing and imaging with FET-based power detectors in a standard 65 nm CMOS process. Based on the plasma-wave theory proposed by Dyakonov and Shur, we designed high-responsivity and low-noise multiple detectors for monitoring a pulse-mode 3.0 THz quantum cascade laser (QCL). Furthermore, we present a fully integrated high-speed 32 × 32-pixel 3.0 THz CMOS image sensor (CIS). The full CIS measures 2.81 × 5.39 mm2 and achieves a 423 V/W responsivity (Rv) and a 5.3 nW integral noise equivalent power (NEP) at room temperature. In experiments, we demonstrate a testing speed reaching 319 fps under continuous-wave (CW) illumination of a 3.0 THz QCL. The results indicate that our terahertz CIS has excellent potential in cost-effective and commercial THz imaging and material detection.

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A 150-to-1050 GHz Terahertz Detector in 65 nm CMOS

Feng

Wang

et al. 2021

2021 IEEE Asian Solid-State Circuits Conference (A-Sscc)

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A 25 fps 32 × 24 Digital CMOS Terahertz Image Sensor

Cited by 3 publications

References 9 publications

Pixel Variation Characteristics of a Global Shutter THz Imager and its Calibration Technique

Pixel Variation Characteristics of a Global Shutter THz Imager and its Calibration Technique

Exploration of high-speed 3.0 THz imaging with a 65 nm CMOS process

A 150-to-1050 GHz Terahertz Detector in 65 nm CMOS

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