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The effect of the annealing time and annealing temperature on Ni/Ge/Au electrode contacts deposited on the n-type InP contact layer has been studied using a circular transmission line model. The minimum specific contact resistance of 3.210 7 cm2was achieved on the low-doped n-type InP contact layer with a 40 s anneal at 425 ℃. In order to improve the ohmic contact and reduce the difficulty in the fabrication of the high doped InP epi-layer, the doping concentration in the InP contact layer was chosen to be 51018cm 3in the fabrication of transferred electronic devices. Excellent differential negative resistance properties were obtained by an electron beam evaporating the Ni/Ge/Au/Ge/Ni/Au composite electrode on an InP epi-layer with a 60 s anneal at 380 ℃. 相似文献
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A speaker driver applied to class G/classⅠwith a single phase power supply is presented.Gain expanding and compressing technology are employed in the signal processing circuit to optimize power dissipation.The circuit is implemented in 0.18μm N-well CMOS.Experimental results show that the speaker driver has a good audio sound quality and power efficiency.Less than 0.006%THD at a low power range and less than 0.4%at a medium power range can be obtained with a 1 kHz sine wave signal.Maximum output power of... 相似文献
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A speaker driver applied to class G/classⅠwith a single phase power supply is presented.Gain expanding and compressing technology are employed in the signal processing circuit to optimize power dissipation.The circuit is implemented in 0.18μm N-well CMOS.Experimental results show that the speaker driver has a good audio sound quality and power efficiency.Less than 0.006%THD at a low power range and less than 0.4%at a medium power range can be obtained with a 1 kHz sine wave signal.Maximum output power of 360 mW can be gained at a load of 8Ω.The power efficiency is about twice that of a traditional class AB driver at the power range of 80 mW and shows more than 18%improvement at the higher output power range. 相似文献
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太阳能干燥设备在食品原料干燥中的应用 总被引:3,自引:1,他引:2
综述了太阳能干燥设备在食品原料干燥领域的应用,分别分析了各种太阳能干燥设备的结构、用途和干燥效果,从自然对流和强迫对流两种不同空气流动方式的角度上,探讨了国内外各种太阳能食品干燥设备的研究进展,着重对便携、储能、废热回收等一般太阳能干燥设备所没有的方面展开分析.介绍了如便携式干燥设备、太阳能辅助干燥设备、太阳能储能干燥设备等适用于食品干燥的太阳能干燥设备的性能及优点,并提出太阳能干燥设备都是向节能和智能化方面,并辅助其他形式的设备一起使用,实现干燥设备可连续作业等观点. 相似文献
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随着电动车和混合电动车等新能源交通工具的发展,人们对于具有高比能量与高功率密度的锂离子电池的需求也在逐渐增高。磷酸铁锂(LiFePO4)作为目前产业最为主流的动力电池正极材料之一,具有安全性能高、循环寿命长以及价格低廉等优点。本文通过研究磷酸铁锂正极材料领域的国内外专利申请文献,分析了该领域的专利申请趋势和主要国家的专利有效性,归纳出全球重点申请人和我国的主要专利权人,对国内专利权人的重点授权专利进行探讨,为相关产业及研究的发展方向提供参考。 相似文献