PTC-Based Sigma-Delta ADCs for High-Speed, Low-Noise Imagers

Author

Xhakoni, Adi ; Ha Le-Thai ; Geurts, T. ; Chapinal, Genis ; Gielen, G.

Author_Institution

Dept. of Electr. Eng., Katholieke Univ. Leuven, Leuven, Belgium

Volume

14

Issue

9

fYear

2014

fDate

Sept. 2014

Firstpage

2932

Lastpage

2933

Abstract

This letter presents a novel column-parallel readout circuit for image sensors based on incremental-sigma-delta (ISD) ADCs. The excessive number of clock cycles needed per conversion is addressed. We apply the photon transfer curve-based conversion to a second-order ISD ADC, achieving a (2.75times ) clock cycles reduction when compared with a standard second-order ISD ADC while maintaining a similar noise performance. This results in the reduction of the pixel readout time and of the size of the digital filter.

Keywords

circuit noise; digital filters; image sensors; readout electronics; sigma-delta modulation; PTC-based sigma-delta ADC; clock cycle reduction; column-parallel readout circuit; digital filter; high-speed low-noise imager; image sensor; incremental-sigma-delta ADC; photon transfer curve-based conversion; pixel readout time; second-order ISD ADC; standard second-order ISD ADC; Clocks; Modulation; Noise; Photonics; Quantization (signal); Sensors; Sigma-delta modulation; ADC; Image sensor; high frame rate; high resolution; incremental (Sigma Delta ); low-noise; photon transfer curve;

fLanguage

English

Journal_Title

Sensors Journal, IEEE

Publisher

ieee

ISSN

1530-437X

Type

jour

DOI

10.1109/JSEN.2014.2332635

Filename

6842586