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Wireless infrastructure imposes increasingly stringent requirements on data converters. To enable base stations with multi-carrier functionality, ADCs in the receive path need high sample rates with superior SFDR across 100s of MHz and several decades of input signal power. Furthermore, as the number of antennas increase, higher ADC integration is required to minimize board area, complexity, and cost.
A 12 bit 1.6 GS/s pipeline ADC realized in a 0.18 µm complementary BiCMOS SiGe process is presented. The ADC consists of a four-way time-interleaved hierarchical structure and a master-slave T/H to improve the dynamic performance of the individual sub-ADCs and to reduce both the complexity of the required interleaving background calibration algorithms and the error rate. It achieves an SFDR of 79...
Risks are widely existing in highway tunnel construction and are related to many influential factors. Based on the analysis of engineering conditions of Maojingba tunnel in Daqing-Guangzhou Expressway, a grey-clustering model is established to evaluate the segmental cave-in Probability level. In this study, six influencing factor, including surrounding rock gradation, tectonics, tunnel embedment depth,...
Field uniformity of our developed reverberation chamber is investigated at calibration stage. The influence of the transmit antenna and the work volume is analyzed and evaluated according to the measurement data. Calibrations with different transmit antenna positions, directions, heights, and dimension of work volume are measured carefully. Field uniformity is analyzed in detail. It is indicated that...
Load effect of our developed reverberation chamber is investigated at calibration stage. The influence of receiving antenna, transmit antenna and EUT is analyzed and evaluated according to the measurement data. Load effect calibrations with different receiving antenna positions, transmit antenna positions, and EUT positions are measured carefully. It is indicated that transmit antenna positions, and...
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