A low-power small-area ADC array for IRFPA readout

Shengyou Zhong; Libin Yao

doi:10.1117/12.2035013

11 September 2013 A low-power small-area ADC array for IRFPA readout

Shengyou Zhong, Libin Yao

Proceedings Volume 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications; 89075G (2013) https://doi.org/10.1117/12.2035013
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The readout integrated circuit (ROIC) is a bridge between the infrared focal plane array (IRFPA) and image processing circuit in an infrared imaging system. The ROIC is the first part of signal processing circuit and connected to detectors directly, so its performance will greatly affect the detector or even the whole imaging system performance. With the development of CMOS technologies, it’s possible to digitalize the signal inside the ROIC and develop the digital ROIC. Digital ROIC can reduce complexity of the whole system and improve the system reliability. More importantly, it can accommodate variety of digital signal processing techniques which the traditional analog ROIC cannot achieve. The analog to digital converter (ADC) is the most important building block in the digital ROIC. The requirements for ADCs inside the ROIC are low power, high dynamic range and small area. In this paper we propose an RC hybrid Successive Approximation Register (SAR) ADC as the column ADC for digital ROIC. In our proposed ADC structure, a resistor ladder is used to generate several voltages. The proposed RC hybrid structure not only reduces the area of capacitor array but also releases requirement for capacitor array matching. Theory analysis and simulation show RC hybrid SAR ADC is suitable for ADC array applications

Citation Download Citation

Shengyou Zhong and Libin Yao "A low-power small-area ADC array for IRFPA readout", Proc. SPIE 8907, International Symposium on Photoelectronic Detection and Imaging 2013: Infrared Imaging and Applications, 89075G (11 September 2013); https://doi.org/10.1117/12.2035013

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KEYWORDS

Capacitors

Synthetic aperture radar

Readout integrated circuits

Analog electronics

Resistors

Infrared imaging

Imaging systems

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