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A new digital readout integrated circuit (DROIC) with pixel parallel A/D conversion and reduced quantization noise |
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| Affiliation: | 1. Institute for Electronic Design Automation, Technische Universität München, Munich, Germany;2. Institute of Microelectronic Systems, Leibniz Universität Hannover, Hannover, Germany;1. Electronics and Telecommunication Department, Cummins College of Engineering for Women, Pune, Maharashtra, India;2. Electronics and Telecommunication Department, College of Engineering Pune, Pune, Maharashtra, India;1. Department of Creative Engineering, National Institute of Technology, Tsuruoka College, Sawada 104, Inooka, Tsuruoka 997-8511, Japan;2. Department of Materials Science and Engineering, Graduate School of Engineering, Tohoku University, Aramakiaza Aoba, Sendai 980-0845, Japan;3. Semiconductor Research Institute of Semiconductor Research Foundation, Aramaki Aza Aoba 519-1176, Sendai 980-0845, Japan;1. National Key Institute of Tunable Laser Technology, Harbin Institute of Technology, Harbin, 150001, China;2. Space Optical Engineering Research Center, Harbin Institute of Technology, Harbin, 150001, China |
| Abstract: | This paper represents a novel digital readout for infrared focal plane arrays with 2.33 Ge− charge handling capacity while achieving quantization noise of 161 e−. Pixel level A/D conversion has been realized by pulse frequency modulation (PFM) technique supported with a novel method utilizing extended integration that eliminates the requirement for an additional column ADC. Digital pixel operates with two phases; the first phase is as ordinary PFM in charge domain and the second phase is in time domain, allowing the fine quantization and low quantization noise. A 32 × 32 prototype has been manufactured and tested. Measured peak SNR at half well fill is 71 dB with significant SNR improvement for low illuminated pixels due to extremely low quantization noise. 32 × 32 ROIC dissipates only 1.1 mW and the figure of merit for power dissipation is measured to be 465 fJ/LSB, compared to 930 fJ/LSB and 1470 fJ/LSB of the state of the art. |
| Keywords: | Digital readout integrated circuit (DROIC) Pixel parallel ADC Pulse frequency modulation (PFM) Extended integration Quantization noise |
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