排序方式: 共有70条查询结果,搜索用时 703 毫秒
31.
研究了量子点分布的误差对镜像电荷量子元胞自动机(QCA)的影响. 镜像电荷QCA每个元胞中的四个量子点是被严格限制在正方形元胞的四个角上的,考虑到现有的量子点生长技术,量子点偏离理想位置的情况是不可避免的. 模拟了在正态分布误差存在时镜像电荷QCA的工作情况,并估算了在较小的介电常数下镜像电荷QCA可能达到的最高工作温度. 仿真结果表明正态分布标准差sigma小于0.1时,镜像电荷QCA可以正常工作,同时缩小QCA的元胞尺寸可以使镜像电荷QCA的最高工作温度达到室温以上. 相似文献
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研究了量子点分布的误差对镜像电荷量子元胞自动机(QCA)的影响.镜像电荷QCA每个元胞中的四个量子点是被严格限制在正方形元胞的四个角上的,考虑到现有的量子点生长技术,量子点偏离理想位置的情况是不可避免的.模拟了在正态分布误差存在时镜像电荷QCA的工作情况,并估算了在较小的介电常数下镜像电荷QCA可能达到的最高工作温度.仿真结果表明正态分布标准差sigma小于0.1时,镜像电荷QCA可以正常工作,同时缩小QCA的元胞尺寸可以使镜像电荷QCA的最高工作温度达到室温以上. 相似文献
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This paper presents an ultra-low-power area-efficient non-volatile memory (NVM) in a 0.18 μm single-poly standard CMOS process for passive radio frequency identification (RFID) tags. In the memory cell, a novel low-power operation method is proposed to realize bi-directional Fowler-Nordheim tunneling during write operation. Furthermore, the cell is designed with PMOS transistors and coupling capacitors to minimize its area. In order to improve its reliability, the cell consists of double floating gates to store the data, and the 1 kbit NVM was implemented in a 0.18 μm single-poly standard CMOS process. The area of the memory cell and 1 kbit memory array is 96 μm2 and 0.12 mm2, respectively. The measured results indicate that the program/erase voltage ranges from 5 to 6 V. The power consumption of the read/write operation is 0.19 μW/0.69 μW at a read/write rate of (268 kb/s)/(3.0 kb/s). 相似文献
34.
研究了量子点分布的误差对镜像电荷量子元胞自动机(QCA)的影响.镜像电荷QCA每个元胞中的四个量子点是被严格限制在正方形元胞的四个角上的,考虑到现有的量子点生长技术,量子点偏离理想位置的情况是不可避免的.模拟了在正态分布误差存在时镜像电荷QCA的工作情况,并估算了在较小的介电常数下镜像电荷QCA可能达到的最高工作温度.仿真结果表明正态分布标准差sigma小于0.1时,镜像电荷QCA可以正常工作,同时缩小QCA的元胞尺寸可以使镜像电荷QCA的最高工作温度达到室温以上. 相似文献
35.
1引言 进入二十世纪九十年代以来,随着个人网络通信技术的发展,功能强大的多媒体终端和便携式数据终端迅速得到了普及。为了实现在任何时间和任何地点自由地进行网络通信的目标,网络通信技术开始从传统的有线计算机网络向无线和移动通信网络方向发展。无线局域网(WLAN)是九十年代末期发展起来的一种无线通信技术,它除了可以提供传统的有线计算机局域网技术的服务功能外,还具有安装便捷、组网灵活、组网成本低和可移动性的优势,因此,在很短的时间内得到了飞速的发展和广泛的应用。 相似文献
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CMOS超高频整流器 总被引:1,自引:0,他引:1
提出了一个适用于无源UHF RFID标签芯片的全CMOS整流器.整流器包括射频-直流转换电路、偏置电路、直流-直流转换电路和振荡器电路.整流器的工作频率范围是860~960 MHz.基于0.18μm,1p6m的标准数字CMOS工艺,设计并实现了无源UHF RFID标签芯片的整流器.该设计采用开关电容电路技术动态地消除了CMOS管开启电压的问题,在标准数字CMOS工艺下实现了高效率的超高频整流器.整流器的面积为180μm×140μm.当输入900MHz,-16dBm的射频信号时,整流器的输出电压为1.2V,启动时间为980μs. 相似文献
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This paper proposes a novel noise optimization technique.The technique gives analytical formulae for the noise performance of inductively degenerated CMOS low noise amplifier(LNA)circuits with an ideal gate inductor for a fixed bias voltage and nonideal gate inductor for a fixed power dissipation,respectively,by mathematical analysis and reasonable approximation methods.LNA circuits with required noise figure can be designed effectively and rapidly just by using hand calculations of the proposed formulae.We design a 1.8 GHz LNA in a TSMC 0.25 μm CMOS process.The measured results show a noise figure of 1.6 dB with a forward gain of 14.4 dB at a power consumption of 5 mW,demonstrating that the designed LNA circuits can achieve low noise figure levels at low power dissipation. 相似文献
40.
This paper proposes a new structure to lower the power consumption of a variable gain amplifier(VGA) and keep the linearity of the VGA unchanged.The structure is used in a high rate amplitude-shift keying(ASK) based IF-stage.It includes an automatic gain control(AGC) loop and ASK demodulator.The AGC mainly consists of sixstage VGAs.The IF-stage is realized in 0.18μm CMOS technology.The measurement results show that the power consumption of the whole system is very low.The system consumes 730μA while oper... 相似文献