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This paper presents an energy efficient high speed DAC structure that is implemented in a 10-bit 150MSample/s successive approximation register (SAR) ADC. To reduce energy consumption and improve ADC linearity, a segmented pre-quantize and bypass architecture is proposed to avoid unnecessary switching of high-weight capacitors based on the results of pre-quantization. Time required for one bit cycling...
In order to solve the problem that most of the directions-of-arrival (DOA) algorithms are based on the prior knowledge of source number and the estimation error of source number leads to the degradation of DOA algorithm performance, a conformal array DOA algorithm with unknown source number is proposed. This method is realized by introducing the pseudo expected signal. The optimum weight deduced by...
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...
We designed a new polymer quartz piezoelectric crystal air sensitive sensor system for rapidly detecting Chinese spirits. The new sensor system can collect and process samples' characteristic datum. 12 kinds of Chinese spirits' standard database which contains 96 template datum were built. We selected 2 kinds of typical Chinese spirits which are SafflowerLang and Maotai to act as the samples in our...
A 0.5V 6-to-10b rate-resolution scalable SAR ADC with microwatt power consumption is presented. Employing the successive approximation register (SAR) architecture, the proposed ADC exhibits the sampling rates of 125kS/s, 150kS/s and 250kS/s at scalable resolutions of 10b, 8b and 6b, respectively. A low-leakage voltage boosting technique is proposed, which reduces the leakage of MOS switches by 99%...
The principle of airborne ocean wind-field detecting system based on GPS scatter signal is proposed. The architecture of Doppler Delay Mapping Receiver (DDMR) was introduced in this paper. Six key techniques were discussed such as improving the Signal Noise Ratio of reflected signal, dual radio frequency front-end, calculating the specular point for Doppler and code delay, implement for multi-channel...
In the area of the distributed sources parameter estimation, the conventional maximum likelihood estimation (MLE) algorithm, which being called 4D-MLE here, is a four dimensional nonlinear optimization problem, therefore its computation cost is very large. A lower dimensional MLE algorithm, which being simplified to three dimensional nonlinear optimization problem, is proposed. It is called 3D-MLE...
This paper describes a novel antenna called the high-power radial line helical array antenna to realize the directional radiation of high-power microwave. This array uses short helical antenna as its radiation element, each helix is excited by the energy coupled by a probe from a radial waveguide. Helices and probes are arranged to form a circular array. This antenna accepts directly an azimuthally...
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