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Proceedings Paper

A novel 32x1 readout integrated circuit with high dynamic range for IRFPA
Author(s): Zhuang Miao; Ning Li; Zhifeng Li
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Paper Abstract

In this paper, a novel 32×1 ROIC with high dynamic range is presented. The ROIC contains a capacitive transimpedance input amplifier (CTIA integrator), followed by a comparator that set a threshold voltage for comparing the integrating signal. It contains the time-to-threshold information in adding additional dynamic range with a linear voltage ramp input, in addition to the regular integration signal. By the end of integration, if the integration signal is less than the threshold voltage, the integration signal is sampled for readout. When the integrating signal is reached to the threshold voltage before the end of integration, the ramping voltage is stored and later sampled for readout in representing the signal level and a digital flag is set in recording the event of trigger. Thus, a high level signal can be saved before it saturating the integrator. A test chip of 32×1 ROIC is designed and fabricated with 0.35 μm triple metal, double poly CMOS technology. The chip test results prove correct function of the circuit with 3.3 V power supply. The results of tracing one channel show that the dynamic range increases 54 dB with a 10-bit ADC and the readout clock frequency is up to 10 MHz.

Paper Details

Date Published: 11 December 2012
PDF: 6 pages
Proc. SPIE 8562, Infrared, Millimeter-Wave, and Terahertz Technologies II, 856225 (11 December 2012); doi: 10.1117/12.982004
Show Author Affiliations
Zhuang Miao, Shanghai Institute of Technical Physics (China)
Ning Li, Shanghai Institute of Technical Physics (China)
Zhifeng Li, Shanghai Institute of Technical Physics (China)

Published in SPIE Proceedings Vol. 8562:
Infrared, Millimeter-Wave, and Terahertz Technologies II
Cunlin Zhang; Xi-Cheng Zhang; He Li; Sheng-Cai Shi, Editor(s)

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