80 Gb/s 2 : 1 multiplexer in 0.13-μm SiGe BiCMOS technology

This work presents an ultra-high speed 2 : 1 multiplexer (MUX) in a SiGe BiCMOS technology with fT = 103 GHz. To boost the operating speed, the system scheme is optimized including a 2 : 1 selector circuit directly driving an external 50 Ω load, and two wide-band data buffers and one clock buffer in the input stage. The chip exhibited an open eye at 80 Gb/s with a 160 mV single-ended voltage swing.     

80 Gb/s 2 ： 1 multiplexer in 0.13-μm SiGe BiCMOS technology

This work presents an ultra-high speed 2 ： 1 multiplexer （MUX） in a SiGe BiCMOS technology with fT = 103 GHz. To boost the operating speed, the system scheme is optimized including a 2 ： 1 selector circuit directly driving an external 50 Ω load, and two wide-band data buffers and one clock buffer in the input stage. The chip exhibited an open eye at 80 Gb/s with a 160 mV single-ended voltage swing.     

Design of a 40-GHz LNA in 0.13-μm SiGe BiCMOS

A low-noise amplifier(LNA)operated at 40 GHz is designed.An improved cascode configuration is proposed and the design of matching networks is presented.Short-circuited coplanar waveguides(CPWs)were used as inductors to achieve a high Q-factor.The circuit was fabricated in a 0.13-μm SiGe BiCMOS technology with a transistor transit frequency fT of 103GHz.The chip area is 0.21mm2.The LNA has one cascode stage with a-3dB bandwidth from 34 to 44GHz.At 40GHz,the measured gain is 8.6dB;the input return loss,S11,is...     

基于0.13微米锗硅BiCMOS工艺的80 Gb/s 2:1 复接器

本文介绍了基于0.13微米锗硅BiCMOS工艺设计的超高速2:1复接器芯片,工艺fT为103 GHz。为了最大限度提高工作速度,系统方案进行了优化,采用了选择器输出直接驱动片外50 Ω负载的形式,并在输入级集成了两个宽带数据放大器和一个时钟放大器。经测试,芯片输出眼图达到了80 Gb/s的速率,单端电压摆幅为160 mV。     

水稻叶绿体DNA的分离纯化及其限制酶切分析

通过在匀浆缓冲液中添加抗坏血酸并结合蔗糖密度梯度离心和差速离心法等分离纯化了水稻叶绿体DNA ( ctDN A )，得率高达100}g八OOB叶，其纯度足以用于限制酶分析和分子生物学研究.环状水稻ctDNA总长度为129.5Kbp, Pvu I , Sal j , Pst f ,Hiad I , EcoRI和BamHI在ctDNA上的切点分别为11, 12, 17, 37, 67和`6.     

纯化水稻叶绿体DNA的新方法

绿色植物叶绿体基因组结构和功能的探讨,是当前植物分子遗传学研究中的一个热点。七十年代中期以来,人们已对近四十种植物的叶绿体DNA(ctDNA)进行了深入的研究并逐渐形成了一套较为成熟的方法。然而,有关主要粮食作物水稻叶绿体基因组的研究,报道很少,其主要原因之一是水稻ctDNA的分离纯化较为困难。最近,我们将新鲜水稻嫩叶在缓冲液中直接匀浆,并调节细胞器悬浮液pH,改变细胞器表面带电状况的新方法,结合蔗糖梯度离心,成功地分离到纯净的水稻叶绿体,获得纯度较     

0.35m SiGe BiCMOS工艺Colpitts振荡器

应用标准0.35μm SiGeBiCMOS工艺设计一个Colpitts压控振荡器并流片。采用线性时变模型(LTV)分析振荡器的相位噪声。在3.3V电源电压下,压控振荡器的频率范围覆盖340～400MHz,10kHz频偏处相位噪声为-91dBc/Hz,输出功率-3dBm。相位噪声的测试结果与理论计算结果符合较好。芯片面积550μm×300μm。     

家蚕卵发育中核糖核酸的比较研究

本工作主要是探讨家蚕滞育性卵,在解除滞育后,胚子发生过程中,在生理及形态上具有一定变化的伸展期(即越冬Ⅳ期,相当于乙_2),最长期(即临界Ⅱ期,相当于丙_2),反转期(相当于己_1)和转青期(相当于己_5)的核糖核酸的动态变化,试图通过对全RNA的分析,从分子生物学观点为滞育性卵胚子发育的生理形态变化,提供蚕卵发育生物学参考。     

基于0.13-µm SiGe BiCMOS工艺的40GHz低噪声放大器设计

设计了一个工作于40 GHz的低噪声放大器,提出了一种改进的Cascode电路结构并设计了匹配网络。为了获取高Q值,电感使用了共面波导短路线实现。电路使用0.13-µm SiGe BiCMOS工艺,其截止频率fT 为103GHz,芯片尺寸为0.21 mm2。该低噪声放大器使用一级Cascode电路结构,-3dB带宽为34GHz到44GHz.。在40GHz频率点上,测量的增益为8.6dB,输入回波损耗S11为-16.2dB。仿真的噪声系数为5dB。在2.5V供电电压下,电路消耗的电流仅为3mA。     

53-GHz平衡式考毕兹振荡器的设计与测试

A 53 GHz Colpitts oscillator implemented in a SiGe：C BiCMOS technology is presented. Limited by a 26.5 GHz frequency analyzer, the oscillator was measured indirectly through an on-chip mixer. The mixer downconverted the oscillating frequency to an intermediate frequency （IF） below 26.5 GHz. By adjusting the local oscillating （LO） frequency and recording the changes of IF frequency, the oscillator＇s output frequency （RF） was determined. Additionally, using phase noise theory of mixers, the oscillator＇s phase noise was estimated as -58 dBc/Hz at 1 MHz offset and the output power was about -21 dBm. The chip is 270 ×480μm in size.