A 16‐bit Hybrid ADC with Circular‐Adder‐Based Counting for 15μm Pitch 640×512 LWIR FPAs. Issue 2 (1st March 2020)

• Record Type: Journal Article
• Authors: Huang, Zhaofeng; Zhu, Yajun; Lu, Wengao; Niu, Yuze; Zhang, Shengdong; Chen, Zhongjian
• Is Part Of: Chinese journal of electronics. Volume 29:Issue 2(2020)
• Page Start: 291
• Page End: 296
• Publication Date: 2020-03-01
• Subjects: Infrared focal plane arrays (IRFPAs) -- Readout integrated circuit -- Hybrid ADC -- 3T memory -- Folding integration; adders -- analogue‐digital conversion -- CMOS integrated circuits -- focal planes -- infrared detectors -- power consumption -- readout electronics; folding integration process -- charge‐handling capacity -- dynamic memory cells -- hardware consumption -- complementary metal‐oxide‐semiconductor process -- power consumption -- pixel‐level ADC -- hybrid ADC -- circular‐adder‐based counting -- LWIR FPA -- long‐wave infrared focal plane arrays -- two‐stage quantization structure -- hybrid analog to digital converter -- CMOS process -- size 0.18 mum -- power 0.214 muW; Electronics -- Periodicals; Electronics -- China -- Periodicals; Electronics; China; Periodicals; 621.38105
• DOI: 10.1049/cje.2020.01.006
• Languages: English
• ISSNs: 1022-4653

Abstract

Abstract : A hybrid Analog to digital converter (ADC) is presented for long‐wave infrared focal plane arrays. A two‐stage quantization structure is applied in the folding integration process, which results in better chargehandling capacity and higher linearity compared with conventional designs while using fewer transistors at the pixel level. By employing a circular‐adder‐based counting structure with 3T dynamic memory cells, hardware consumption can be reduced. A pixel circuit of pitch 15μm has been designed using the 0.18mm Complementary metal‐oxide‐semiconductor (CMOS) process. The power consumption of the pixel‐level ADC is 0.214μW, and the charge‐handling capacity is 1Ge ‐ . Simulation results demonstrate a signal‐to‐noise ratio of 90dB and a nonlinearity of 0.11%.