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The Square Kilometer Array, Mid-Band, is envisioned as a multipurpose radio astronomy telescope of very high sensitivity, containing as many as 2000 reflector antennas. The combined specifications arising from multiple science missions creates a very challenging design problem for the component reflector antennas in the array. This paper describes the optical design of Dish Verification Antenna 1...
Hybrid microwave integrated circuit technology is used to design and develop an L-band (900–2100 MHz) ultra-low noise amplifier for the MeerKAT array. This low noise amplifier achieved 2 K noise temperature, more than 40 dB gain, S11 & S22 better than −11 & −15 dB at 15 K ambient. Linearity and gain compression is verified. The noise performance is explored as the cooling temperature changes...
A 5.0G-pixel/s readout circuit for 15.3mm×8.6mm optical size, 3.7M-pixel, 1300 fps, and digital output image sensor is presented. To achieve 5.0G-pixel/s readout rate, the high speed column readout circuit is introduced. The novel pixel readout, A/D conversion, and digital data transfer schemes are introduced to realize the readout rate and to reduce the interference noise. The 1 horizontal (1H) readout...
This paper presents the design and implementation of an 11-bit 50-MS/s split successive approximation register (SAR) analog-to-digital converter (ADC) that features a comparator with input-referred offset cancellation, an improved split capacitor digital-to-analog converter (CDAC), and a CDAC mismatch calibrator. In order to reduce the input loading capacitance of the split CDAC, an extra unit capacitor...
This paper presents a high speed parallel segmented capacitive DAC that is implemented in a 10-bit 150MSample/s successive approximation register (SAR) ADC. Compared to converters that use the conventional structure, the speed of converting one bit digital code can be 4 times faster while the power remains relatively low. In the switching procedure, a small capacitor array is used to determine the...
A 210 MS/s dual-channel 12-bit analog-to-digital converter (ADC) employing a pipelined successive approximation (SAR) architecture is presented. The ADC is partitioned into 3 stages with passive residue transferring between the 1st and the 2nd stages and active residue amplification between the 2nd and the 3rd stages. The ADC consumes 5.3 mW from a 1-V supply and achieves an SNDR of 63.48 dB at a...
Recent publications have demonstrated ADCs with ENOB > 11, sampling frequencies > 50MHz, with power < 50mW, making the SAR ADC architecture an attractive alternative to the traditional pipeline. This paper presents a production quality 11.5 ENOB, 89dB SFDR, 100MS/s SAR ADC that, including the voltage reference and digital calibration circuitry, consumes 8mW and uses 0.1mm2 in 28nm CMOS. It...
A compact W-band heterodyne receiver module populated with MMIC LNAs designed and fabricated using a 35 nm InP HEMT process, and an IQ mixer designed and fabricated using the UMS Schottky diode process is developed as the prototype for Argus, a 16-pixel focal plane array to be deployed on the 100-meter Robert C. Byrd Green Bank Telescope in West Virginia to study star formation. The module has a WR-10...
A new highly energy-efficient SAR ADC with capacitor constructed bypass-window structure is proposed for low-power biomedical applications. The proposed structure is able to bypass the first few conversion phases when the input signal is within a pre-defined window, resulting in an overall power reduction of 59% when the input signal has a possibility of 80% to activate the bypass-window function...
A third generation of CMOS Active Pixel Sensor (APS) for high and low light imaging (HaLLI) applications is presented. The sensor pixel 128 × 128 array features more feasible and robust circuit design than its predecessors, which allows for remarkable thermal (KTC) noise suppression, bringing the anticipated noise floor below 1e- rms. A new on-focal, column parallel, two phase, Single Slope (SS) 10...
In Visible Light Communication (VLC) each LED's on-off status can be recovered only after its projected position in each measurement frame is determined. Finding the LED projection is not straightforward since: 1) Clutter and noise corrupt the measurements; 2) When the LED is turned off, its position cannot be extracted by evaluating the intensity value of each pixel. Herein, a new method based on...
Fusion of ambient breathing signals can be hampered by the current environmental conditions. Fusion methods that are resistant to most adverse ambient conditions may still be susceptible to some. The diversity of multiple fusion methods can be leveraged by employing a variety of fusion methods to fuse each breathing epoch. By using a trained linear classifier to select the best candidate fusion method...
In this paper a technique for estimating the single channel Wiener filter post-processor using two complementary adaptive near-field beamformers is presented as an alternative to voice activity detection for speech enhancement applications. Two near-field beamformers, the MVDR beamformer and an adaptive nullformer based on noise to signal maximisation, are used to generate estimates of signal and...
In generalized sidelobe canceller beamforming (GSC) algorithm, the blocking matrix Alters out the desired signal in order to pass the interference signal and noise. In this paper, we propose a DAP-GSC beamforming algorithm based on double affine projection (DAP) algorithm to restrain the desired signal, when the blocking matrix (BM) can't cancel the desired signal completely. We add a Normalize Least...
Despite the LCD monitor manufacturing costs per square inch dropping below $2 this year, full-size, 14″×17″ digital chest x-ray detector systems are still being sold commercially for tens of thousands of dollars, for two main reasons. First, the extra required p+ doped silicon layer cannot be deposited in the same fabrication facility as a standard thin-film transistor panel for LCD monitors. Secondly,...
One way of performing indoor localization of objects is by means of Angle of Arrival (AoA). This technology is based on a phased antenna array which estimates the angle of arrival of an incident wave transmitted by a mobile node. This is achieved by measuring the relative phase shifts between the received signals. This paper presents the construction of a Phase Locked Loop (PLL) which synchronizes...
The need for localizing multiple main-beam targets in the presence of interference, clutter and jammers arises in scenarios such as: air defense, where a radar detection may correspond to one or multiple targets (e.g., a missile launched from an airborne platform); ballistic missile defense, where the incoming missile complex involves a large number of objects; cruise missile defense for low angle...
This article uses the novelty and applicability of adaptive genetic algorithms for the development of advanced digital radio frequency memory jammer technology uses radar CFAR detection algorithm. As a major result, demonstrates how adaptive genetic algorithms can produce effective single-resistant interference. This is an important attribute when interference uncertain radar detection algorithms...
The FPGA/NIOS ® FIR filter based on linear prediction (LP) to suppress radio frequency interference (RFI) has been installed in several radio stations in the Auger Engineering Radio Array (AERA) experiment. AERA observes coherent radio emission from extensive air showers induced by ultra-high-energy cosmic rays to make a detailed study of the development of the electromagnetic part of air showers...
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