Zhong-Jian Chen

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A two-stage charge sensitive amplifier structure suitable for silicon radiation detector with large capacitance is proposed. It has the advantage that the integration capacitor can be large to reduce the gain sensibility to detector capacitance variation without any stability problem. The feasibility of the proposed circuit is verified by comparing the(More)
Seed germination is a complicated biological process that requires regulation through various enzymatic and non-enzymatic mechanisms. Although it has been recognized that reactive oxygen species (ROS) regulate radicle emergence and root elongation in a non-enzymatic manner during dicot seed germination, the role of ROS in monocot seed germination remains(More)
Stability is a critical design issue for radiation detection readout circuit when high counting rate together with low power property is simultaneously required. In this letter a novel method which increases the phase margin of the pulse shaper is presented. A readout circuit using this compensation technique has been implemented in 0.35 µ CMOS(More)
Seed germination is a complicated biological process that requires regulated enzymatic and non-enzymatic reactions. The action of polyamine oxidase (PAO) produces hydrogen peroxide (H2O2), which promotes dicot seed germination. However, whether and, if so, how PAOs regulate monocot seed germination via H2O2 production is unclear. Herein, we report that the(More)
This paper presents a switched-capacitor readout circuit designed for the closed-loop MEMS capacitive accelerometer with a full scale of ±2g. The offset voltage of amplifiers is compensated and the low-frequency noise is reduced by using CDS technique, thus the precision of the whole system is significantly improved. The chip has been fabricated in a(More)
In this study, we examined steady-state and dynamic photosynthetic performance and leaf nitrogen (N) partitioning in the typical shade-demanding herb Panax notoginseng grown along a light gradient. Gas exchange on a leaf area basis was significantly reduced under low irradiance, with gas exchange on a leaf mass basis reaching a maximum value and then(More)
A readout integrated circuit (ROIC) for uncooled infrared focal plane array (IRFPA) is presented in this paper. The ROIC is designed for a 384×288 detector array made of amorphous silicon microbolometers with a pixel-pitch of 35μm. A capacitive trans-impedance amplifier (CTIA) is used in each column to integrate the pixel signal. The design is(More)
This paper describes a radiation detection readout circuit for portable dosimeter which is aimed at low power, low noise and high counting rate. A current feedback baseline holder circuit is proposed to solve the baseline shift problem without any other performance deterioration. The core circuit has been implemented in 0.35μm CMOS technology. It(More)
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