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    • 31. 发明授权
    • Wide band LNA with noise canceling
    • 宽带LNA,具有降噪功能
    • US08138835B2
    • 2012-03-20
    • US12796593
    • 2010-06-08
    • Yi ZengXiaoyong LiRahul A Apte
    • Yi ZengXiaoyong LiRahul A Apte
    • H03F3/04
    • H03F1/0205H01B3/004H03F1/26H03F1/42H03F3/195H03F3/211H03F3/347H03F2200/294H03F2200/36H03F2200/372H03F2200/451
    • Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is characterized by a first node and a second node. The first amplifier converts a noise voltage at the first node into a first noise current at an output of the first amplifier. The second amplifier is directly coupled to the output of the first amplifier and provides noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node. The proposed techniques eliminate the need for large ac coupling capacitors and reduce the die size occupied by the LNA. The elimination of ac coupling capacitors between amplification stages of the LNA allows current reuse resulting in reduced current consumption.
    • 描述了改进具有噪声消除的低噪声放大器(LNA)的技术。 LNA包括第一和第二放大器,它们一起工作来噪声消除在输入级电路处产生的噪声。 输入级电路接收RF信号,其特征在于第一节点和第二节点。 第一放大器将第一节点处的噪声电压转换为第一放大器的输出处的第一噪声电流。 第二放大器直接耦合到第一放大器的输出,并且通过将第一噪声电流与由第二放大器产生的第二噪声电流相加作为第二节点处的噪声电压的函数来提供噪声消除。 所提出的技术消除了对大型交流耦合电容器的需要,并且减小了LNA占用的管芯尺寸。 在LNA的放大级之间消除交流耦合电容器允许电流重用,从而减少电流消耗。
    • 33. 发明授权
    • Self-calibrated wide range LC tank voltage-controlled oscillator (VCO) system with expanded frequency tuning range and method for providing same
    • 自校准的宽范围LC箱压控振荡器(VCO)系统具有扩展的频率调谐范围和提供相同的方法
    • US07940140B2
    • 2011-05-10
    • US12156607
    • 2008-06-03
    • Yi ZengFreeman Zhong
    • Yi ZengFreeman Zhong
    • H03L7/099H03L1/00H03B5/08
    • H03L7/099H03B5/1215H03B5/1228H03B5/1253H03B5/1265
    • The present invention is a self-calibrating, dual-band, wide range LC tank Voltage Controlled Oscillator (VCO) system. The system may include a first Voltage-Controlled Oscillator (VCO) and a second Voltage-Controlled Oscillator (VCO). The system may further include a calibration engine. The calibration engine may be configured for being connectable to at least one of the first VCO or the second VCO. The calibration engine may further be configured for automatically establishing/providing a VCO fix capacitor band code setting and a gear control setting for selectively activating or inactivating the first VCO and/or the second VCO. The calibration engine may be further configured for automatically comparing a VCO control voltage of the system to an allowable control voltage range for the system and may be further configured for automatically adjusting the VCO fix capacitor band code setting and/or the gear control setting when the VCO control voltage falls outside of the allowable control voltage range.
    • 本发明是一种自校准的双频宽范围LC槽压控振荡器(VCO)系统。 该系统可以包括第一电压控制振荡器(VCO)和第二电压控制振荡器(VCO)。 该系统还可以包括校准引擎。 校准引擎可以被配置为可连接到第一VCO或第二VCO中的至少一个。 校准引擎还可以被配置为自动建立/提供VCO固定电容器频带码设置和齿轮控制设置,用于选择性地激活或失活第一VCO和/或第二VCO。 校准引擎可以被进一步配置用于将系统的VCO控制电压自动地与系统的允许控制电压范围进行比较,并且还可以被配置为在自动调整VCO固定电容器频带代码设置和/或齿轮控制设置时 VCO控制电压超出允许的控制电压范围。
    • 35. 发明授权
    • Method for GPS positioning in a weak signal environment
    • GPS信号环境中GPS定位的方法
    • US07710317B2
    • 2010-05-04
    • US11347498
    • 2006-02-03
    • MingQiang ChengCheng LiBo YuShiJie LiXiquan YangYi Zeng
    • MingQiang ChengCheng LiBo YuShiJie LiXiquan YangYi Zeng
    • G01S1/00G01S1/02
    • G01S19/25G01S19/254G01S19/258
    • The present invention is a method for GPS positioning in a weak signal environment. The method includes obtaining assistance data for a GPS signal from a satellite at a predetermined time, wherein the assistance data including predicted navigation data, Doppler shift and Doppler shift rate and the GPS signal being modulated by a carrier signal, a pseudorandom code and navigation data, estimating a predicted receiving time for the GPS signal reaching the GPS receiver, capturing the GPS signal, converting the GPS signal to an intermediate frequency signal, acquiring a code phase of the pseudorandom code from the intermediate frequency signal by using the assistance data and the predicted receiving time, and obtaining a position for the GPS receiver based on the predicted navigation data and the code phase of the pseudorandom code. To acquire the code phase of the pseudorandom code, the GPS receiver corrects a real time clock to one millisecond accuracy and process the intermediate frequency signal through coherent correlation of one second.
    • 本发明是一种在弱信号环境中进行GPS定位的方法。 该方法包括在预定时间从卫星获取GPS信号的辅助数据,其中辅助数据包括预测的导航数据,多普勒频移和多普勒频移以及由载波信号调制的GPS信号,伪随机码和导航数据 估计到达GPS接收机的GPS信号的预测接收时间,捕获GPS信号,将GPS信号转换成中频信号,通过使用辅助数据从中频信号获取伪随机码的码相位, 预测的接收时间,并且基于所预测的导航数据和伪随机码的码相位来获得GPS接收机的位置。 为了获取伪随机码的代码阶段,GPS接收机将实时时钟校正为1毫秒精度,并通过1秒的相干相关处理中频信号。
    • 38. 发明授权
    • Qinghaosu derivatives against AIDS
    • 青蒿素衍生物抗艾滋病
    • US5726203A
    • 1998-03-10
    • US581629
    • 1996-05-21
    • Zelin LiXuande LuoYi ZengLin Ma
    • Zelin LiXuande LuoYi ZengLin Ma
    • C07D493/20A61K31/335C07D323/04
    • C07D493/20
    • This invention relates to the compounds represented by general formula (I) and the processes for their preparation, wherein R is selected from C.sub.1 -C.sub.4 alkyl, C.sub.3 -C.sub.6 cycloalkyl, phenyl unsubstituted or substituted by a halogen atom or nitro group, biphenyl unsubstituted by a halogen atom or nitro group, naphthyl unsubstituted or substituted by a halogen atom or nitro group. The compounds of this invention are used to prepare agents for prevention and treatment of AIDS and drugs against malaria and toxoplasmosis. ##STR1##
    • PCT No.PCT / CN94 / 00056 Sec。 371日期:1996年5月21日 102(e)日期1996年5月21日PCT提交1994年7月19日PCT公布。 第WO95 / 03311号公报 日本特开1995年2月2日本发明涉及由通式(I)表示的化合物及其制备方法,其中R选自C 1 -C 4烷基,C 3 -C 6环烷基,未被取代或被卤素原子或硝基取代的苯基 基团,被卤素原子或硝基取代的联苯基,未被取代或被卤素原子或硝基取代的萘基。 本发明的化合物用于制备用于预防和治疗AIDS和药物以防止疟疾和弓形体病的药剂。 (一)
    • 39. 发明授权
    • Distributed computer systems with time-dependent credentials
    • 具有时间依赖凭证的分布式计算机系统
    • US08640210B2
    • 2014-01-28
    • US13224257
    • 2011-09-01
    • Mark NovakPaul J. LeachYi ZengSaurav SinhaK Michiko ShortGopinathan Kannan
    • Mark NovakPaul J. LeachYi ZengSaurav SinhaK Michiko ShortGopinathan Kannan
    • G06F21/00H04L9/32H04L9/00H04L29/06G06F15/00
    • H04L63/0846
    • A distributed system in which time-dependent credentials are supplied by controllers that operate according to different local times. Errors that might arise from the controllers generating inconsistent credentials because of time skew are avoided by identifying credentials generated during transition intervals in which different ones of the controllers may generate different credentials at the same absolute time. During a transition interval, controllers and other devices may use credentials differentially based on the nature of the authentication function. Each controller may periodically renew its credentials based on self-scheduled renewals or based on requests from other devices, such that renewal times are offset by random delays to avoid excessive network traffic. Controllers may determine which credential is valid for any given time, based on a cryptographically secure key associated with that time and information identifying the entity that is associated with that credential.
    • 分布式系统,其中根据不同的本地时间操作的控制器提供时间依赖的凭证。 通过识别在过渡间隔期间生成的凭证可以避免控制器因产生时间偏差而产生不一致凭据的错误,其中不同的控制器可能会在同一绝对时间产生不同的凭据。 在转换间隔期间,控制器和其他设备可以基于认证功能的性质差异地使用凭证。 每个控制器可以基于自调度续订或基于来自其他设备的请求来定期更新其凭证,使得更新时间被随机延迟抵消以避免过多的网络流量。 控制器可以基于与该时间相关联的加密安全密钥以及识别与该凭证相关联的实体的信息来确定哪个凭证对于任何给定时间是有效的。
    • 40. 发明申请
    • WIDE BAND LNA WITH NOISE CANCELING
    • 宽带上弦与噪音消除
    • US20110193635A1
    • 2011-08-11
    • US12796593
    • 2010-06-08
    • Yi ZengXiaoyong LiRahul A. Apte
    • Yi ZengXiaoyong LiRahul A. Apte
    • H03F3/04H03F1/26
    • H03F1/0205H01B3/004H03F1/26H03F1/42H03F3/195H03F3/211H03F3/347H03F2200/294H03F2200/36H03F2200/372H03F2200/451
    • Techniques to improve low noise amplifiers (LNAs) with noise canceling are described. LNA includes a first and a second amplifier which work together to noise cancel the noise generated at an input stage circuit. The input stage circuit receives an RF signal and is characterized by a first node and a second node. The first amplifier converts a noise voltage at the first node into a first noise current at an output of the first amplifier. The second amplifier is directly coupled to the output of the first amplifier and provides noise canceling by summing the first noise current with a second noise current generated by the second amplifier as a function of the noise voltage at the second node. The proposed techniques eliminate the need for large ac coupling capacitors and reduce the die size occupied by the LNA. The elimination of ac coupling capacitors between amplification stages of the LNA allows current reuse resulting in reduced current consumption.
    • 描述了改进具有噪声消除的低噪声放大器(LNA)的技术。 LNA包括第一和第二放大器,它们一起工作来噪声消除在输入级电路处产生的噪声。 输入级电路接收RF信号,其特征在于第一节点和第二节点。 第一放大器将第一节点处的噪声电压转换为第一放大器的输出处的第一噪声电流。 第二放大器直接耦合到第一放大器的输出,并且通过将第一噪声电流与由第二放大器产生的第二噪声电流相加作为第二节点处的噪声电压的函数来提供噪声消除。 所提出的技术消除了对大型交流耦合电容器的需要,并且减小了LNA占用的管芯尺寸。 在LNA的放大级之间消除交流耦合电容器允许电流重用,从而减少电流消耗。