Low noise is a key requirement of Readout Integrated Circuits (ROIC) in
hyperspectral applications for its low radiation. Correlated Double
Sampling (CDS) is commonly used to suppress noise. In this paper, CDS is
improved by adjusting the time interval between the clamp and
sample-and-hold (SH), which can filter low-frequency noise flexibly. An
ROIC input stage integrated with low-noise capacitive trans-impedance
amplifiers (CTIA) and CDS with adjustable interval (AICDS) is designed
in 180 n m CMOS process. A timing generator is proposed to vary
the interval regulation amount from 0 μs to 15 μs . The SPECTRE
simulation indicates that, by decreasing this time interval, the noise
electrons are significantly decreased from 48.72 e - to 22.15 e - , and
SNR is enhanced by 5 dB (20 pA injection current). The design of AICDS
can improve the noise performance of hyperspectral ROIC, thus can be
widely used.
Low noise is a key requirement of Readout Integrated Circuit (ROIC) in hyperspectral application for its low radiation. The Correlated Double Sampling (CDS) technology is commonly used to suppress the effect of noise. In this paper, CDS is improved by adjusting the time interval between the clamp and sample hold (SH), which can filter low frequency noise flexibly. A ROIC input stage integrated with low-noise Capacitive trans-impedance amplifiers (CTIA) and CDS with adjustable interval (AICDS) is designed. The SPECTRE simulation indicates that, by extending the CDS reset time, the simulation result is consistent with the analysis. The number of noise electrons reaches 32.59 e-, which is better than 56.7 e- without extending the reset time. The design of AICDS can improve the noise performance of hyperspectral ROIC, and can be widely used.
Low noise is a significant performance requirement of Hyperspectral Shortwave Infrared Focal Plane Arrays Readout Circuit (ROIC) for its low radiation. And the current Correlated Double Sampling (CDS) technology for noise reduction needs to be further improved. The mechanism of extended reset time CDS, which has an impact on noise, is analyzed; By establishing the "first-order low-pass filter, delay-subtractor, sample-hold" model, the output noise power spectral density of image pixel ROIC as a function of CDS extended reset time is analyzed. To verify the analysis, a pixel integrated with low-noise Capacitive trans-impedance amplifiers (CTIA) and adjustable reset time CDS is designed. By extending the CDS reset time, the simulation result is consistent with the analysis. The number of noise electrons reaches 24.42e-, which is better than 50.11e-without CDS and 34.45e-without extending the reset time. The design of Reset Time Extended CDS can improve the noise performance of hyperspectral readout circuits, and can be widely used.
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