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报道了一种4GS/s 4bit超宽带(UWB)模数转换器(ADC)芯片,采用1.4um发射级宽度、2层金属布线的InGaP/GaAs HBT工艺实现。该芯片采用折叠内插架构来最小化其面积和电路规模。为了消除折叠内插电路中的偶发错误码,该ADC采用了一种新颖的比特同步电路。实测结果表明,其在4GS/s采样率下具有3.8GHz的模拟带宽和2.6GHz的有效精度带宽(ERBW),在2.6GHz输入带宽内ADC的有效位数大于3.4bit,在4GHz输入带宽内有效位大于3bit。在6.001GHz输入并将输入功率提高4dB后,有效位仍然高达3.49bit,表明该ADC可采样的频率范围包含从第一到第三奈奎斯特区(DC~6GHz)。该芯片的DNL和INL在4GS/s下均小于±0.15LSB,总面积为1.45×1.45 mm2,总功耗为1.98W。 相似文献
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文[1]证明了垂足三角形的一个性质: 定理若△DEF是非直角△ABC的垂足三角形,△ABC的外接圆半径为R,△DEF的外接圆半径为R0,有 R0=(1)/(2)R. 相似文献
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An ultra-wideband 4 GS/s 4 bit analog-to-digital converter(ADC)which is fabricated in 2-level interconnect, 1.4μm InGaP/GaAs HBT technology is presented.The ADC has a-3 dB analog bandwidth of 3.8 GHz and an effective resolution bandwidth(ERBW)of 2.6 GHz.The ADC adopts folding-interpolating architecture to minimize its size and complexity.A novel bit synchronization circuit is used in the coarse quantizer to eliminate the glitch codes of the ADC.The measurement results show that the chip achieves larger than 3.4 ENOBs with an input frequency band of DC-2.6 GHz and larger than 3.0 ENOBs within DC-4GHz at 4 GS/s.It has 3.49 ENOBs when increasing input power by 4 dB at 6.001 GHz of input.That indicates that the ADC has the ability of sampling signals from 1st to 3rd Nyquist zones(DC-6 GHz).The measured DNL and INL are both less than±0.15 LSB. The ADC consumes power of 1.98 W and occupies a total area of 1.45×1.45 mm~2. 相似文献
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具有高速同步功能的12.5Gbps 1:16 解复用器集成电路 总被引:1,自引:1,他引:0
A 12.5 Gbps 1:16 demultiplexer (DEMUX) integrated circuit is presented for multi-channel high-speed data transmission. A novel high-speed synchronizing technique is proposed and integrated in this DEMUX chip. Compared with conventional synchronizing techniques, the proposed method largely simplifies the system configuration. The experimental result demonstrates that the proposed circuit is effective in two-channel synchronization under a clock frequency of 12.5 GHz. The circuit is realized using 1 μ m GaAs heterojunction bipolar transistor technology with die area of 2.3 × 2.3 mm2. 相似文献
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建立了高效液相色谱-三重四极杆质谱测定克氏原鳌虾中多菌灵的新方法。样品在碱性条件下经乙酸乙酯提取,离心,上清液经旋转蒸发浓缩并复溶后采用混合型阳离子(MCX)萃取小柱富集净化。以乙腈和水为流动相,采用C18色谱柱进行梯度洗脱分离。在电喷雾正离子源下,采用多反应监测模式检测。结果表明:多菌灵在0.5~50.0 μg/L范围内线性关系良好,相关系数(r2)为0.9985。多菌灵的检出限和定量限分别为0.25 μg/kg和0.50 μg/kg。当加标水平为0.5、1.0、5.0和50.0 μg/kg时,加标回收率为83.9%~105.5%,相对标准偏差为1.1%~3.2%(n=6)。该方法能简单、有效地检测出克氏原鳌虾中多菌灵的残留量,且稳定性好,结果可靠。 相似文献
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A 12.5 Gbps 1:16 demultiplexer(DEMUX) integrated circuit is presented for multi-channel high-speed data transmission.A novel high-speed synchronizing technique is proposed and integrated in this DEMUX chip. Compared with conventional synchronizing techniques,the proposed method largely simplifies the system configuration. The experimental result demonstrates that the proposed circuit is effective in two-channel synchronization under a clock frequency of 12.5 GHz.The circuit is realized using 1μm GaAs heteroj unction bipolar transistor technology with die area of 2.3×2.3 mm~2. 相似文献
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以QuEChERS作为样品前处理手段,采用超高效液相色谱-串联质谱(UPLC-MS/MS)检测技术,建立了稻田水产品中毒死蜱残留的检测方法。样品经乙腈提取,由0.2 g乙二胺-N-丙基硅烷(PSA)和1.2 g无水硫酸镁分散萃取净化,采用Hypersil GOLD C18色谱柱(100 mm×2.1 mm,5 μm)进行分离,用加热大气压电喷雾电离源、正离子模式进行扫描,在选择反应监测模式下检测,基质匹配标准曲线外标法定量。结果表明,毒死蜱在0.5~100.0 μg/L范围内线性关系良好,相关系数大于0.999;毒死蜱的加标回收率为86.2%~103.6%,相对标准偏差为3.5%~7.6%(n=6),检出限为0.25 μg/kg,定量限为0.5 μg/kg。该方法简单、快速、灵敏,能够满足稻田水产品中毒死蜱残留的检测需求。 相似文献
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本文通过对多组样品的试验测定,建立了一种渔用饲料中8种常用磺胺(磺胺嘧啶、磺胺甲基嘧啶、磺胺二甲基嘧啶、磺胺噻唑、磺胺甲基异噁唑、磺胺多辛、磺胺异噁唑和磺胺喹噁啉)的超高效液相色谱检测法。具体是:样品经2%乙酸浸润,4℃预冷的乙腈提取,碱性氧化铝柱净化,用Symmetry-C18色谱柱(5μm,4.6×150mm),2%乙酸-甲醇梯度洗脱,紫外检测,检测波长270nm。结果表明,8种磺胺的定量底限为2mg/kg,在0.5~20μg/m L内,线性关系良好,R20.99。添加水平10mg/kg时,8种磺胺类药物的平均回收率范围为70%~100%,RSD15。该方法回收率高,简单,准确可靠,可用于渔用饲料中磺胺类药物残留的监测。 相似文献
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