Research on high linearity analog counter for digital pixel circuit

Dongci Fang; Wenbiao Mao; Shengyou Zhong; Libin Yao; Nan Chen; Zhihao Li

doi:10.1117/12.3048116

13 December 2024 Research on high linearity analog counter for digital pixel circuit

Dongci Fang, Wenbiao Mao, Shengyou Zhong, Libin Yao, Nan Chen, Zhihao Li

Author Affiliations +

Proceedings Volume 13493, AOPC 2024: Infrared Technology and Applications; 134930E (2024) https://doi.org/10.1117/12.3048116
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

The analog counter counts the input pulses by increasing the analog voltage. The input pulse controls the charging and discharging process of the counting capacitor to increase the voltage on the capacitor, and the voltage value is proportional to the number of pulses. There are two main design methods for analog counter: one is to charge the capacitor through a current source within a certain period of time, and the voltage on the capacitor increases during each high-level pulse; The second is the redistribution of charge between two capacitors, transferring the charge on the small capacitor to the large capacitor, achieving a voltage increase on the large capacitor. This paper simulates and analyzes three analog counter Structures implemented by the above two methods, comparing their performance in terms of counting step consistency, area, swing, DNL (Differential Non-linearity), and INL (Integral Non-linearity). Based on the above analysis, an analog counter with high linearity and high swing is designed in 180nm standard CMOS process, with a resolution of 7 bits and a swing of 0.4V~3.3V. In the worst case, the DNL is 0.039LSB and the INL is 0.206LSB. Compared with a digital counter of the same resolution, the proposed analog counter significantly reduces the layout area occupied. Compared with previous designs, the proposed analog counter circuit with its advantages of small area and low power consumption, can be applied to infrared focal plane digital pixel circuit.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Dongci Fang, Wenbiao Mao, Shengyou Zhong, Libin Yao, Nan Chen, and Zhihao Li "Research on high linearity analog counter for digital pixel circuit", Proc. SPIE 13493, AOPC 2024: Infrared Technology and Applications, 134930E (13 December 2024); https://doi.org/10.1117/12.3048116

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KEYWORDS

Analog electronics

Capacitors

Pulse signals

Circuit switching

Digital electronics

Clocks

Digital electronic circuits

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