A Flexible Programmable Memory BIST for Embedded Single‐Port Memory and Dual‐Port Memory

Programmable memory built‐in self‐test (PMBIST) is an attractive approach for testing embedded memory. However, the main difficulties of the previous works are the large area overhead and low flexibility. To overcome these problems, a new flexible PMBIST (FPMBIST) architecture that can test both single‐port memory and dual‐port memory using various test algorithms is proposed. In the FPMBIST, a new instruction set is developed to minimize the FPMBIST area overhead and to maximize the flexibility. In addition, FPMBIST includes a diagnostic scheme that can improve the yield by supporting three types of diagnostic methods for repair and diagnosis. The experiment results show that the proposed FPMBIST has small area overhead despite the fact that it supports various test algorithms, thus having high flexibility.     

基于FPGA的DDR3 SDRAM控制器的设计与优化

为解决超高速采集系统中的数据缓存问题,文中基于Xilinx Kintex-7 FPGA MIG_v1.9 IP核进行了DDR3 SDRAM控制器的编写,分析并提出了提高带宽利用率的方法。最终将其进行类FIFO接口的封装,屏蔽掉了DDR3 IP核复杂的用户接口,为DDR3数据流缓存的实现提供便利。系统测试表明,该设计满足大容量数据缓存要求,并具有较强的可移植性。     

An Effective Test and Diagnosis Algorithm for Dual‐Port Memories

This paper proposes a test algorithm that can detect and diagnose all the faults occurring in dual‐port memories that can be accessed simultaneously through two ports. In this paper, we develop a new diagnosis algorithm that classifies faults in detail when they are detected while the test process is being developed. The algorithm is particularly efficient because it uses information that can be obtained by test results as well as results using an additional diagnosis pattern. The algorithm can also diagnose various fault models for dual‐port memories.     

基于单片机控制的具有串口通讯的温控器

在化工、冶金领域,需要对每台设备的温度进行监控。为了便于监控,实现计算机网络控制非常必要。介绍以单片机P89LPC935为核心,实现计算机网络控制。通过键盘输入温度范围,通过温度传感器实时测量,当温度超出设置的范围失控时,通过串口和主计算机进行通讯提示出现故障,并语音报警,从而实现智能化温度控制。     

PXA255微处理器的同步串行控制器接口原理与应用程序设计

PXA255微处理器的同步串行控制器（SSPC）是一个全双工、同步串行通信接口控制器,它可以方便地与具有串行通信协议的外设直接相连,用于在短距离与外设之间传送控制／状态信息和输入／输出数据。文中详细介绍PXA255同步串行控制器所支持的串行通信协议格式、寄存器结构及接口原理,以具体实例介绍PXA255同步控制器在实际开发中应用。     

One‐to‐All Broadcasting of Odd Networks for One‐Port and All‐Port Models

Odd networks were introduced in the context of graph theory. However, their potential as fault‐tolerant multiprocessor networks has been shown. Broadcasting is one of the most important communication primitives used in multiprocessor networks. In this letter, we introduce efficient one‐to‐all broadcasting schemes of odd networks for one‐port and all‐port models. We show the broadcasting time of the former is 2d?2 and that of the latter is d–1. The total time steps taken by the proposed algorithms are optimal.     

Dual‐Salt Mg‐Based Batteries with Conversion Cathodes

Mg batteries as the most typical multivalent batteries are attracting increasing attention because of resource abundance, high volumetric energy density, and smooth plating/stripping of Mg anodes. However, current limitations for the progress of Mg batteries come from the lack of high voltage electrolytes and fast Mg‐insertable structure prototypes. In order to improve their energy or power density, hybrid systems combining Li‐driven cathode reaction with Mg anode process appear to be a potential solution by bypassing the aforementioned limitations. Here, FeS _x (x = 1 or 2) is employed as conversion cathode with 2–4 electron transfers to achieve a maximum energy density close to 400 Wh kg^?1, which is comparable with that of Li‐ion batteries but without serious dendrite growth and polysulphide dissolution. In situ formation of solid electrolyte interfaces on both sulfide and Mg electrodes is likely responsible for long‐life cycling and suppression of S‐species passivation at Mg anodes. Without any decoration on the cathode, electrolyte additive, or anode protection, a reversible capacity of more than 200 mAh g^?1 is still preserved for Mg/FeS₂ after 200 cycles.     

Design for a Dual‐Frequency Antenna‐in‐Package

For an antenna‐in‐package (AiP), via holes are used to connect the antenna ground and system ground. In this letter, a dual‐frequency AiP with a U‐slot embedded in the patch is proposed. By properly arranging three via holes under the non‐radiating edge, an AiP with two resonant frequencies is realized. Then a U‐slot is embedded in the patch to further improve the bandwidth of the AiP. To validate the proposed design, an AiP with the bandwidth of 4.49% at 2.45 GHz and 6.02% at 5.32 GHz is achieved and fabricated. The measured results agree with the simulated results.     

Dual‐Band Double‐Cylindrical‐Ring 3D Frequency Selective Surface

This study presents a dual‐band 3D frequency selective surface that provides a large degree of freedom in frequency and bandwidth adjustability. The proposed structure is evaluated in terms of its structural parameters, and prototypes are fabricated. The radius of the copper rings and the height of the cylinders are considered, and are shown through full‐wave electromagnetic simulations to have a significant effect on the frequency characteristics of the frequency selective surface. The measurement results of the fabricated samples are compared with the simulation results, and a satisfactory agreement is obtained.     

Design of Balanced Dual‐Band Bandpass Filter with Self‐Feedback Structure

A balanced dual‐band bandpass filter based on λ/2 stepped‐impedance resonators and open‐loop resonators is proposed in this letter. By employing a type of self‐feedback structure, an extra transmission zero is introduced near the common‐mode resonance frequency, and the common‐mode signal is suppressed. The measured results indicate that the filter can operate in 2.46 GHz and 5.6 GHz bands, and the insertion loss is 1.85 dB and 1.9 dB, respectively. Also, better common‐mode suppression is achieved.     

A Flexible Dual‐Ion Battery Based on Sodium‐Ion Quasi‐Solid‐State Electrolyte with Long Cycling Life

Sodium‐based dual‐ion batteries (SDIBs) have attracted much attention for their advantages of high operating voltage, environmental friendliness, and especially low cost. However, the electrochemical performances of the reported SDIBs are still unsatisfied due to the decomposition problem of traditional liquid electrolyte under high working voltage. Development of quasi‐solid‐state electrolytes (QSSEs) with excellent electrochemical stability at high voltage is a possible means to improve their properties. In this work, a flexible SDIB based on a QSSE, consisting of poly(vinylidene ?uoride‐co‐hexa?uoropropylene) (PVDF‐HFP) three‐dimensionally cross‐linked with Al₂O₃ nanoparticles, which exhibits a porous 3D structure with dramatically enhanced ionic conductivity up to ≈1.3 × 10^?3 S cm^?1, facilitating fast ionic migration of both anions and cations, is reported. This quasi‐state SDIB exhibits a high specific capacity of 96.8 mAh g^?1 at a current rate of 5 C and excellent cycling stability with a capacity retention of 97.5% after 600 cycles at 5 C, which is the best performance of the SDIBs. Moreover, excellent flexibility and a wide working temperature range (?20 to 70 °C) have been realized for this battery, suggesting its potential for high‐performance flexible energy storage applications.     

Low‐Power‐Photon Up‐Conversion in Dual‐Dye‐Loaded Polymer Nanoparticles

Sensitized triplet–triplet annihilation in multicomponent organic systems is already demonstrated to be suitable for obtaining efficient up‐conversion in solution with excitation power densities comparable to solar irradiance, but loses efficiency in the solid state. Here, it is demonstrated that it is possible to reduce this limitation by incorporating a standard bicomponent system in polymer nanoparticles. The confinement of all of the involved photophysical processes in a nanometer‐scale volume makes each nanoparticle a single and isolated high‐efficiency up‐converting unit. As a consequence, these dual‐dye‐loaded nanoparticles can be used to produce drop‐cast films, as well as dopants for polymeric matrices, preserving the performances of the starting moieties in solution.     

High‐Performance Dual‐Circularly Polarized Reflector Antenna Feed

This paper presents a high‐performance dual‐circularly polarized feed employing a dielectric‐filled circular waveguide. Novel features are incorporated in the proposed feed, such as a dielectric rod radiator for high gain and good impedance matching; dual quarter‐wave chokes for low axial ratio over wide angles and for low back radiation; an integrated septum polarizer; and two end‐launch‐type coaxial‐to‐waveguide transitions. The proposed feed shows excellent performance at 5.0 GHz to 5.2 GHz.     

Compact Dual‐Wideband Bandpass Filter with Multimode Resonator

A microstrip dual‐wideband bandpass filter using a multimode resonator (MMR) is proposed in this letter. The proposed MMR loaded with a T‐shaped open‐ended stub and a short‐ended stub exhibits triple mode characteristics, and a synthesis method is developed to illustrate the wide passband with independently controllable center frequencies and bandwidths. To verify this design methodology, a dual‐wideband filter with fractional bandwidths of 19.1% and 27.9% is designed and fabricated. The measured results agree with the simulations.     

A High‐Potential Anion‐Insertion Carbon Cathode for Aqueous Zinc Dual‐Ion Battery

Aqueous dual‐ion batteries (DIBs) are promising for large‐scale energy storage due to low cost and inherent safety. However, DIBs are limited by low capacity and poor cycling of cathode materials and the challenge of electrolyte decomposition. In this study, a new cathode material of nitrogen‐doped microcrystalline graphene‐like carbon is investigated in a water‐in‐salt electrolyte of 30 m ZnCl₂, where this carbon cathode stores anions reversibly via both electrical double layer adsorption and ion insertion. The (de)insertion of anions in carbon lattice delivers a high‐potential plateau at 1.85 V versus Zn²⁺/Zn, contributing nearly 1/3 of the capacity of 134 mAh g^?1 and half of the stored energy. This study shows that both the unique carbon structure and concentrated ZnCl₂ electrolyte play critical roles in allowing anion storage in carbon cathode for this aqueous DIB.     

Fully Printed Dual‐Band Power Divider Miniaturized by CRLH Phase‐Shift Lines

In this letter, a compact and fully printed composite right‐ and left‐handed (CRLH) dual‐band power divider is proposed. The branches of the conventional Wilkinson power divider are replaced by subwavelength CRLH phase‐shift lines having +90° for one frequency and ?90° for another frequency for dual‐band and miniaturization performance. Equations are derived for the even‐ and odd‐mode analysis combined with the dual‐band CRLH circuit. A PCS and a WLAN band are chosen as the test case and the circuit approach agrees with the CAD simulation and the measurement. Additionally, the CRLH property is shown with the dispersion diagram and the eightfold size reduction is noted.     

Emerging Dual‐Channel Transition‐Metal‐Oxide Quasiaerogels by Self‐Embedded Templating

The lack of precise control of particle sizes is the critical challenge in the assembly of 3D interconnected transition‐metal oxide (TMO) for newly‐emerging energy conversion devices. A self‐embedded templating strategy for preparing the TMO@carbon quasiaerogels (TMO@C‐QAs) is proposed. By mimicking an aerogel structure at a microscale, the TMO@C‐QA successfully assembles size‐controllable TMO nanoparticles into 3D interconnected structure with surface‐enriched carbon species. The morphological evolutions of intermediates verify that the self‐embedded Ostwald ripening templating approach is responsible for the dual‐channel TMO@C‐QA formation. The general self‐embedded templating strategy is easily extended to prepare various TMO@C‐QAs, including the Co₃O₄@C‐QA, Mn₃O₄@C‐QA, Fe₂O₃@C‐QA, and NiO@C‐QA. Benefiting from the unparalleled 3D interconnected network of aerogels, the Co₃O₄@C‐QA displays superior bifunctional catalytic activities for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), as well as high specific capacity and excellent long‐term stability for lithium‐ion battery (LIB) anode. A proof‐of‐concept battery‐powered electrolyzer with Co₃O₄@C‐QA cathode and anode powered by a full LIB with Co₃O₄@C‐QA anode is presented. The battery‐powered electrolyzer made of the state‐of‐the‐art TMOs can exhibit great competitive advantages due to its supreme multifunctional energy conversion performance for future water electrolysis.     

Differential Dual‐Frequency Antenna for Wireless Communication

A novel differential dual‐frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz.     

Tri‐band Microstrip Bandpass Filter Using Dual‐Mode Stepped‐Impedance Resonator

This letter presents a compact dual‐mode tri‐band bandpass filter by using a short‐circuited stub‐loaded stepped‐impedance resonator (SIR) and a short‐circuited stub‐loaded uniform impedance resonator. Also, a hairpin SIR geometry is introduced to miniature the size of this filter while maintaining excellent performance. The use of a short‐circuited stub at the central point of the hairpin SIR can generate two resonant modes in two passbands. Its equivalent circuit structure is analyzed by using the even‐odd mode theory. For demonstration purposes, a tri‐band filter for the applications of the Global Positioning System at 1.57 GHz, Worldwide Interoperability for Microwave Access at 3.5 GHz, and wireless local area networks at 5.2 GHz is designed, fabricated, and measured.     

A Dual‐Mode Narrow‐Band Channel Filter and Group‐Delay Equalizer for a Ka‐Band Satellite Transponder

This paper presents the design of a narrow‐band channel filter and its group‐delay equalizer for a Ka‐band satellite transponder. We used an 8th order channel filter for high selectivity with an elliptic‐integral function response and an inline configuration. We designed a 2‐pole, reflection‐type, group‐delay equalizer to compensate for the steep variation of the group‐delay at the output of the channel filter, keeping the thermal stability at ±7 ns of group‐delay variation at the band edges over 15–55 ·C. We devised a new tuning technique using short‐ended dummy cavities and used it for tuning both the filter and equalizer; this removes the necessity of additional tuning after the cavities are assembled. Through measurement, we demonstrate that the group‐delay‐equalized filter meets the equipment requirements and is appropriate for satellite input multiplexers.