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Proceedings Paper

Low-FPN high-gain capacitive transimpedance amplifier for low-noise CMOS image sensors
Author(s): Boyd A. Fowler; Janusz Balicki; Dana How; Michael Godfrey
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Paper Abstract

In this paper we introduce a low fixed pattern noise (LFPN) capacitive transimpedance amplifier (CTIA) for active pixel CMOS image sensors (APS) with high switchable gain and low read noise. The LFPN CTIA APS uses a switched capacitor voltage divider feedback circuit to achieve high sensitivity, low gain FPN, and low read noise. This paper discusses the operation of the LFPN CTIA APS, and presents a theoretical analysis of its gain FPN and read noise. We do not analyze the effect of 1/f noise, since it is typically much smaller than the thermal and shot noise effects. Monte Carlo simulation of gain FPN and SPICE simulation of read noise are also presented. For a 0.35 micrometers CMOS LFPN CTIA at room temperature and an output data rate of 16Mpixel/sec, we show that the pixel amplifier gain FPN is less than 0.0064, where FPN is defined as the ratio of standard deviation to mean. The read noise and dynamic range are less than 3 electrons RMS and greater than 90dB respectively. We find that theory and simulated results match closely.

Paper Details

Date Published: 15 May 2001
PDF: 10 pages
Proc. SPIE 4306, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications II, (15 May 2001); doi: 10.1117/12.426991
Show Author Affiliations
Boyd A. Fowler, Pixel Devices International Inc. (United States)
Janusz Balicki, Pixel Devices International Inc. (United States)
Dana How, Pixel Devices International Inc. (United States)
Michael Godfrey, Pixel Devices International Inc. (United States)


Published in SPIE Proceedings Vol. 4306:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications II
Nitin Sampat; John Canosa; Morley M. Blouke; John Canosa; Nitin Sampat, Editor(s)

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