Synopsys推出Synphony高层次综合解决方案

新思科技宣布推出其Synphony HLS（High Level Synthesis）解决方案。该解决方案集成了M语言和基于模型的综合法,与传统RTL流程相比,能够为通信和多媒体应用提供高达10倍速的更高的设计和验证能力。     

高性能定点DSP位处理单元(BMU)设计

位处理单元(BMU)是定点数字信号处理器(DSP)中主要的运算单元。数字信号处理器要做大量的位处理的运算,因此该单元的设计极大地影响着DSP的性能。用全定制的方法设计用于定点DSP的位处理单元。该电路具有逻辑/算术移位、指数提取、归一化等功能,有效地解决了定点DSP的浮点运算功能。该BMU在CSMC 0.5μm CMOS工艺下实现,一共包含4 527个晶体管,资源消耗较少,在5 V工作电压下,工作速度达到了114 MHz,符合高性能DSP的要求。     

基于方位deramp和NFS大斜视聚束SAR成像算法

该文针对聚束SAR回波信号方位向频谱混叠和大斜视时距离向和方位的严重耦合,提出了一种结合方位向deramp和非线性频率变标(NFS)的斜视聚束SAR成像算法。首先在方位向进行deramp操作,消除方位频谱混叠。然后通过非线性频率变标并考虑距离向时频变换的标度变化补偿方位相位,实现场景成像。仿真结果表明,该算法可有效消除方位频谱混叠,具有较高的精度,满足大斜视聚束SAR的成像要求和较大测绘带宽度要求。     

Tetradentate Pt(II) 3,6-substitued salophen complexes: Synthesis and tuning emission from deep-red to near infrared by appending donor-acceptor framework

Two novel tetradentate platinum (II) 3,6-substituted salophen complexes of Pt-2 and Pt-3 were synthesized and characterized, in which the substituted group is a donor (D) unit of 4,4′-di(tert-butyl)triphenylamine (Bu^tTPA) for Pt-2 and a donor-acceptor (D-A) framework of Bu^tTPA and benzothiadiazole (BT) for Pt-3. Their thermal, optophysical, electrochemical and electroluminescent properties were primarily investigated. It is found that the emission for this type of tetradentate platinum (II) complexes is tuned from deep red to near infrared by appending D-A framework under photo-excitation. As a result, Pt-3 presented a significant near infrared electroluminescence peaked at 703 nm in its doped polymer light-emitting devices (PLEDs). The maximum external quantum efficiency of 0.88% is observed in the Pt-3 doped PLEDs using a blend of poly(vinylcarbazole) and 1,3-bis(5-(4-(tert-butyl)phenyl)-1,3,4-oxadiazol-2-yl) benzene as the host matrix. Our work indicates that appending D-A framework into tetradentate Pt(II) salophen complex is a useful strategy to get high-performance near infrared emission for this type of tetradentate Pt (II) complexes.     

Metal‐Free Alkyne Polyhydrothiolation: Synthesis of Functional Poly(vinylenesulfide)s with High Stereoregularity by Regioselective Thioclick Polymerization

A new synthetic route to sulfur‐rich polymers has been developed. The alkyne polyhydrothiolations of 4,4′‐thiodibenzenethiol ( 1 ) and arylene dipropiolates ( 2 – 5 ) mediated by amines proceed at room temperature in a regioselective fashion, furnishing sole anti‐Markovnikov products of poly(vinylenesulfide)s (P 1 / 2 –P 1 / 5 ) with high molecular weights (M_w up to 32 300) and high stereoregularities (Z content up to 81.4%) in high yields (up to 98.2%). Polymers P 1 / 2 –P 1 / 4 are soluble in common organic solvents. They are optically transparent, allowing almost all visible and IR light to transmit through. Thanks to the high sulfur contents of the polymers, their films show high refractive indices (n = 1.73–1.70) in the wavelength region of 500–1700 nm as well as high Abbé numbers (ν_D' up to 539) and low optical dispersions (D' down to 0.002) at wavelengths important for telecommunications. Their refractivities can be further enhanced (n up to 2.06) by metal complexation and their films can be crosslinked by UV irradiation, which enables ready fabrication of fluorescent photopatterns.