ALTAIR: A Low-Noise, Low-Power High Speed and Wide Dynamic Range ASIC for X and γ Ray Spectroscopy with CdTe/CdZnTe Pixel Detectors

2020 ◽  
pp. 1-1
Author(s):  
D. Macera ◽  
M. Gandola ◽  
M. Sammartini ◽  
G. Bertuccio
Keyword(s):  
Low Power ◽  
High Speed ◽  
Dynamic Range ◽  
Low Noise ◽  
Wide Dynamic Range ◽  
Pixel Detectors ◽  
Γ Ray

A Low-Noise, Low-Power, Wide Dynamic Range Logarithmic Amplifier for Biomedical Applications

2018 ◽  
Vol 27 (07) ◽  
pp. 1850104 ◽  
Author(s):  
Yuwadee Sundarasaradula ◽  
Apinunt Thanachayanont
Keyword(s):  
Low Power ◽  
Biomedical Applications ◽  
Dynamic Range ◽  
Supply Voltage ◽  
Low Noise ◽  
Power Supply Voltage ◽  
Wide Dynamic Range ◽  
Dc Offset ◽  
Limiting Amplifier ◽  
Logarithmic Amplifier

This paper presents the design and realization of a low-noise, low-power, wide dynamic range CMOS logarithmic amplifier for biomedical applications. The proposed amplifier is based on the true piecewise linear function by using progressive-compression parallel-summation architecture. A DC offset cancellation feedback loop is used to prevent output saturation and deteriorated input sensitivity from inherent DC offset voltages. The proposed logarithmic amplifier was designed and fabricated in a standard 0.18[Formula: see text][Formula: see text]m CMOS technology. The prototype chip includes six limiting amplifier stages and an on-chip bias generator, occupying a die area of 0.027[Formula: see text]mm2. The overall circuit consumes 9.75[Formula: see text][Formula: see text]W from a single 1.5[Formula: see text]V power supply voltage. Measured results showed that the prototype logarithmic amplifier exhibited an 80[Formula: see text]dB input dynamic range (from 10[Formula: see text][Formula: see text]V to 100[Formula: see text]mV), a bandwidth of 4[Formula: see text]Hz–10[Formula: see text]kHz, and a total input-referred noise of 5.52[Formula: see text][Formula: see text]V.

scholarly journals An Approach for a Wide Dynamic Range Low-Noise Current Readout Circuit

2020 ◽  
Vol 10 (3) ◽  
pp. 23
Author(s):  
Wei Wang ◽  
Sameer Sonkusale
Keyword(s):  
High Speed ◽  
Dynamic Range ◽  
Low Noise ◽  
Current Gain ◽  
Readout Circuit ◽  
Wide Dynamic Range ◽  
Noise Current ◽  
Readout Circuits ◽  
Conversion Stage ◽  
Gain Stage

Designing low-noise current readout circuits at high speed is challenging. There is a need for preamplification stages to amplify weak input currents before being processed by conventional integrator based readout. However, the high current gain preamplification stage usually limits the dynamic range. This article presents a 140 dB input dynamic range low-noise current readout circuit with a noise floor of 10 fArms/sq(Hz). The architecture uses a programmable bidirectional input current gain stage followed by an integrator-based analog-to-pulse conversion stage. The programmable current gains setting enables one to achieve higher overall input dynamic range. The readout circuit is designed and in 0.18 μm CMOS and consumes 10.3 mW power from a 1.8 V supply. The circuit has been verified using post-layout simulations.

The Hybrid Pixel Sensors and Read-Out Electronics

2006 ◽  
Vol 113 ◽  
pp. 453-458 ◽  
Author(s):  
R. Navickas ◽  
V. Barzdenas
Keyword(s):  
Dynamic Range ◽  
High Sensitivity ◽  
Low Noise ◽  
Wide Dynamic Range ◽  
Pixel Detectors ◽  
Linear Behavior ◽  
Pixel Sensors ◽  
A Charge ◽  
Silicon Cmos ◽  
Physical Principles

Hybrid pixel sensors (detectors) have shown to be a valid alternative to other types of Xray imaging devices due to their high sensitivity, linear behavior and wide dynamic range, and low noise. One important feature of these devices is the fact that detectors and readout electronics are manufactured separately. The charge created by the interaction of X-ray photons in the sensor is very small and has to be amplified in a low-noise circuit before any further signal processing. The signal induced on the electrodes of the sensor is transferred to the readout chip, where it is integrated in a charge sensitive amplifier. The issue reviews on physical principles of operation and design of the hybrid pixel sensors developed on the basis of the silicon CMOS and GaAs MESFETtechnologies. The authors have designed GaAs charge sensitive amplifiers for hybrid pixel detectors and show the results of a simulation.

scholarly journals Photon Counting Imaging with Low Noise and a Wide Dynamic Range for Aurora Observations

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5958
Author(s):  
Zhen-Wei Han ◽  
Ke-Fei Song ◽  
Hong-Ji Zhang ◽  
Miao Yu ◽  
Ling-Ping He ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
High Speed ◽  
Counting Rate ◽  
Dynamic Range ◽  
Imaging System ◽  
Photon Counting ◽  
Low Noise ◽  
Pulse Shaper ◽  
Wide Dynamic Range ◽  
Aerospace Applications

The radiation intensity of observed auroras in the far-ultraviolet (FUV) band varies dramatically with location for aerospace applications, requiring a photon counting imaging apparatus with a wide dynamic range. However, combining high spatial resolution imaging with high event rates is technically challenging. We developed an FUV photon counting imaging system for aurora observation. Our system mainly consists of a microchannel plate (MCP) stack readout using a wedge strip anode (WSA) with charge induction and high-speed electronics, such as a charge sensitive amplifier (CSA) and pulse shaper. Moreover, we constructed an anode readout model and a time response model for readout circuits to investigate the counting error in high counting rate applications. This system supports global rates of 500 kilo counts, 0.610 dark counts s−1 cm−2 at an ambient temperature of 300 K and 111 µm spatial resolution at 400 kilo counts s−1 (kcps). We demonstrate an obvious photon count loss at incident intensities close to the counting capacity of the system. To preserve image quality, the response time should be improved and some noise performance may be sacrificed. Finally, we also describe the correlation between counting rate and imaging resolution, which further guides the design of space observation instruments.

scholarly journals Measurement of synchrotron-radiation-excited Kossel patterns

2016 ◽  
Vol 23 (1) ◽  
pp. 214-218 ◽  
Author(s):  
G. Bortel ◽  
G. Faigel ◽  
M. Tegze ◽  
A. Chumakov
Keyword(s):  
High Resolution ◽  
Dynamic Range ◽  
Structural Information ◽  
Photon Counting ◽  
Spot Size ◽  
Low Noise ◽  
X Rays ◽  
Technical Problems ◽  
Pixel Detectors ◽  
Exciting Beam

Kossel line patterns contain information on the crystalline structure, such as the magnitude and the phase of Bragg reflections. For technical reasons, most of these patterns are obtained using electron beam excitation, which leads to surface sensitivity that limits the spatial extent of the structural information. To obtain the atomic structure in bulk volumes, X-rays should be used as the excitation radiation. However, there are technical problems, such as the need for high resolution, low noise, large dynamic range, photon counting, two-dimensional pixel detectors and the small spot size of the exciting beam, which have prevented the widespread use of Kossel pattern analysis. Here, an experimental setup is described, which can be used for the measurement of Kossel patterns in a reasonable time and with high resolution to recover structural information.

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