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Slots A novel printed Yagi-Uda antenna fed by balanced microstrip line is proposed. All the active dipole, reflector and director are printed on the same side of a dielectric substrate. The feeding line printed on the same side with the dipole is directly connected to one of active dipole's branches, while the other feeding line is printed on the other side and connected to another branch through...
A novel T-type fractal boundary wide-slot broadband circularly polarized printed antenna for L-band applications is proposed. The T-type fractal boundary wide-slot is fed by a L-shaped metal microstrip, and the broadband CP is obtained by co-acting of the L-shaped metal microstrip and the T-type fractal boundary. This antenna is designed by simulations and experiments. And results show that the impedance...
Slots which are parallel with the bottom side are loaded at the two equilateral sides of the monopole isosceles triangle printed antenna to achieve multi-band in the operating frequency. The antenna is simulated by CST MICROWAVE STUDIO®, a 3-dimentional full wave electromagnetic simulation software, the simulated results indicate that the central frequency of the pass-band, as well as the bandwidth...
A high gain axial-mode helical antenna with parasitic element is proposed. A metal wafer is used as parasitic element, loaded in the front of general axial-mode helical antenna to achieve the aim of improving antenna gain. The diameter of the wafer and the distance between the wafer and the end of the helical wire, which can influence the antenna characteristics, are both simulated and optimized by...
A novel planar composite triangle monopole ultrawideband antenna fed by microstrip is proposed in this paper. Radiating element of the antenna is a combination of three similar triangles from small to large, and the width of the microstrip change gradient. Simulation results from CST software demonstrate that the antenna has stable input impedance and stable patterns in the 3.1-10.6GHz, with H plane...
The feed part which uses gradually changing structure usually has wider impedance bandwidth. A kind of trapezoid dipole antenna that is similar to the parallel dual-feed is analyzed in the essay. Adopting the software of CST Microwave to simulate how the structure parameter of antenna influences impedance character, a type of dipole antenna working within 1.85~3.75GHz is designed. The simulation results...
An 8-bit analog-to-digital (A/D) converter from 1.3 V supply voltage in 0.18 mum CMOS technology without use of low-threshold MOS transistor is presented. The A/D converter features a low voltage reference generator, modified pipeline chopper amplifier and pre-equalized comparator. Simulation result shows the A/D converter achieves + 0.17 LSB differential nonlinearity (DNL), + 0.34 LSB integral nonlinearity...
Two testing time reducing schemes of histogram-based BIST (built-in self test) for testing of ADC IPs (intellectual property) are presented in this paper. The first technique uses parallel time decomposition to minimize not only chip area overhead but also testing time in the ADC BIST based on histogram. The second scheme named fold linear histogram-based BIST is proposed to further reduce testing...
A low-cost BIST scheme based on linear histogram for testing ADC is presented in this paper. A parallel time decomposition technique is presented to minimize not only hardware overhead but also testing time of the BIST scheme based on histogram. An area-efficient linear triangular waveform generator is discussed as test stimulus. The technique uses digital delta-sigma noise shaping to generate the...
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