Analysis of low-offset CTIA amplifier for small-size-pixel infrared focal plane array

Xue Zhang; Zhangcheng Huang; Xiumei Shao

doi:10.1117/12.2073171

20 November 2014 Analysis of low-offset CTIA amplifier for small-size-pixel infrared focal plane array

Xue Zhang, Zhangcheng Huang, Xiumei Shao

Proceedings Volume 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications; 93002F (2014) https://doi.org/10.1117/12.2073171
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

The design of input stage amplifier becomes more and more difficult as the expansion of format arrays and reduction of pixel size. A design method of low-offset amplifier based on 0.18-μm process used in small-size pixel is analyzed in order to decrease the dark signal of extended wavelength InGaAs infrared focal plane arrays (IRFPA). Based on an example of a cascode operational amplifier (op-amp), the relationship between input offset voltage and size of each transistor is discussed through theoretical analysis and Monte Carlo simulation. The results indicate that input transistors and load transistors have great influence on the input offset voltage while common-gate transistors are negligible. Furthermore, the offset voltage begins to increase slightly when the width and length of transistors decrease along with the diminution of pixel size, and raises rapidly when the size is smaller than a proximate threshold value. The offset voltage of preamplifiers with differential architecture and single-shared architecture in small pitch pixel are studied. After optimization under same conditions, simulation results show that single-shared architecture has smaller offset voltage than differential architecture.

Citation Download Citation

Xue Zhang, Zhangcheng Huang, and Xiumei Shao "Analysis of low-offset CTIA amplifier for small-size-pixel infrared focal plane array", Proc. SPIE 9300, International Symposium on Optoelectronic Technology and Application 2014: Infrared Technology and Applications, 93002F (20 November 2014); https://doi.org/10.1117/12.2073171

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KEYWORDS

Transistors

Amplifiers

Monte Carlo methods

Staring arrays

Indium gallium arsenide

Readout integrated circuits

Computer architecture

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