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1. 发明申请

WO2006047701A2 DISTRIBUTED RFID INTERROGATION SYSTEM AND METHOD OF OPERATING THE SAME 审中-公开
标题翻译：分布式RFID接口系统及其操作方法
公开(公告)号：WO2006047701A2
公开(公告)日：2006-05-04
申请号：PCT/US2005038833
申请日：2005-10-26
申请人： WJ COMMUNICATIONS INC , MRAVCA JIM
发明人： MRAVCA JIM
CPC分类号： G06K7/0008 , G06K7/10475
摘要： A system and method are provided for interrogating passive radio frequency identification (RFID) transponders located in compartmentalized areas such as on shelves or in other spatially-partitioned storage areas. The system includes a controller and a plurality of minimal function RFID readers coupled to the controller via a network-compatible cable. The controller is configured to address a subset of at least one reader at a time to interrogate the RFID transponders located in at least one of the compartmentalized areas. The readers are each give a physical location and a unique address, through which the controller would know the locations of the RFID transponders being interrogated.
摘要翻译：提供了一种系统和方法，用于询问位于诸如在货架上或其他空间分隔的存储区域的区域化区域中的无源射频识别（RFID）应答器。该系统包括控制器和经由网络兼容电缆耦合到控制器的多个最小功能RFID读取器。控制器被配置为一次寻址至少一个读取器的子集，以询问位于至少一个区隔区域中的RFID应答器。读者每个都给出一个物理位置和一个独特的地址，通过该地址，控制器将知道被询问的RFID应答器的位置。

2. 发明申请

WO2005101528A3 HETEROJUNCTION BIPOLAR TRANSISTOR HAVING NON-UNIFORMLY DOPED COLLECTOR FOR IMPROVED SAFE-OPERATING AREA 审中-公开
标题翻译：具有非均质聚光器的异相双极晶体管用于改进的安全操作区域
公开(公告)号：WO2005101528A3
公开(公告)日：2005-12-22
申请号：PCT/US2005011641
申请日：2005-04-06
申请人： WJ COMMUNICATIONS INC , LEE CHIEN PING , CHAU FRANK HIN FAI , WANG NANLEI LARRY , DUNNROWICZ CLARENCE JOHN , CHEN YAN , LIN BARRY JIA-FU
发明人： LEE CHIEN PING , CHAU FRANK HIN FAI , WANG NANLEI LARRY , DUNNROWICZ CLARENCE JOHN , CHEN YAN , LIN BARRY JIA-FU
IPC分类号： H01L29/08 , H01L29/737 , H01L31/0328
CPC分类号： H01L29/0821 , H01L29/7371
摘要： The safe-operating area (SOA) in a heterojunction bipolar transistor (HBT) is improved by providing a collector region in the transistor having a graded (continuous or stepped) doping between the base region and the underlying subcollector region with the collector doping being lowest near the base and highest near the subcollector and with the collector doping being less than the doping of the subcollector. The non-uniformly doped collector reduces Kirk effect induced breakdown when collector current increases.
摘要翻译：在异质结双极晶体管（HBT）中的安全工作区域（SOA）通过在晶体管中提供集电极区域来改善，晶体管在基极区域和下面的子集电极区域之间具有渐变（连续或阶梯）掺杂，集电极掺杂最低靠近基极并且在子集电极附近最高，并且集电极掺杂小于子集电极的掺杂。当集电极电流增加时，非均匀掺杂的集电极会降低Kirk效应引起的击穿。

3. 发明申请

WO2005119905A2 LINEARITY ENHANCED AMPLIFIER 审中-公开
标题翻译：线性增强放大器
公开(公告)号：WO2005119905A2
公开(公告)日：2005-12-15
申请号：PCT/US2005/018723
申请日：2005-05-26
申请人： WJ COMMUNICATIONS, INC. , TAKAHASHI, Greg
发明人： TAKAHASHI, Greg
IPC分类号： H03F3/04
CPC分类号： H03F1/3241
摘要： An amplifier circuit according to one embodiment of the present invention comprises an amplifier transistor configured to amplify an input signal received at a terminal of the amplifier transistor, and a bias circuit having a bias transistor forming a current mirror with the amplifier transistor for stabilizing a bias operating point for the amplifier transistor, a buffer transistor coupled to the bias transistor and to the amplifier transistor, and a current source coupled to the buffer transistor and configured to generate a temperature-dependent current for injection into the buffer transistor. The buffer transistor provides DC bias control of the amplifier transistor and improves linearity of the amplifier transistor by creating a predistortion of the input signal, and the current source injects the temperature-dependent current into the buffer transistor to adjust the extent of predistortion and to compensate for effects caused by variations in ambient conditions.
摘要翻译：根据本发明的一个实施例的放大器电路包括放大器晶体管，被配置为放大在放大器晶体管的端子处接收的输入信号，以及偏置电路，其具有与放大器晶体管形成电流镜的偏置晶体管，用于稳定偏置放大器晶体管的工作点，耦合到偏置晶体管和放大器晶体管的缓冲晶体管，以及耦合到缓冲晶体管并被配置为产生用于注入缓冲晶体管的温度相关电流的电流源。缓冲晶体管提供放大器晶体管的直流偏置控制，通过产生输入信号的预失真来提高放大器晶体管的线性度，并且电流源将温度相关的电流注入到缓冲晶体管中，以调整预失真的程度并进行补偿对于环境条件变化引起的影响。

4. 发明申请

WO2007058958A3 CONFIGURABLE HOMODYNE/HETERODYNE RADIO RECEIVER AND RFID READER EMPLOYING SAME 审中-公开
公开(公告)号：WO2007058958A3
公开(公告)日：2007-05-24
申请号：PCT/US2006/043832
申请日：2006-11-10
申请人： WJ COMMUNICATIONS, INC. , BELLANTONI, John, Vincent
发明人： BELLANTONI, John, Vincent
IPC分类号： H04B1/28 , H04B1/30 , H03D7/16
摘要： The embodiments of the present invention provide a configurable homodyne/heterodyne RF receiver including first and second mixers. The configurable homodyne/heterodyne RF receiver functions as a homodyne receiver when the first and second mixers are configured to operate in parallel, and as a heterodyne receiver when the first and second mixers are configured to operate in series. The embodiments of the present invention further provides an RFID reader employing the configurable homodyne/heterodyne RF receiver to facilitate a listen-before-talk function.

5. 发明申请

WO2005119905A3 LINEARITY ENHANCED AMPLIFIER 审中-公开
标题翻译：线性增强放大器
公开(公告)号：WO2005119905A3
公开(公告)日：2007-05-24
申请号：PCT/US2005018723
申请日：2005-05-26
申请人： WJ COMMUNICATIONS INC , TAKAHASHI GREG
发明人： TAKAHASHI GREG
IPC分类号： H03F3/04
CPC分类号： H03F1/3241
摘要： An amplifier circuit (610) according to one embodiment of the present invention comprises an amplifier transistor (QRF) configured to amplify an input signal received at a terminal of the amplifier transistor (QRP), and a bias circuit (Rb1, Rb4, C1, Qb2, Qb1, Rb3, Rb5, Rb2 and ITC) having a bias transistor (Qb 1) forming a current mirror with the amplifier transistor (QRF) for stabilizing a bias operating point for the amplifier transistor, and a current source (ITC) coupled to the buffer transistor (Qb2) and configured to generate a temperature-dependent current for injection into the buffer transistor. The buffer transistor (Qb2) improves the linearity of the amplifier transistor (QRF) by creating a predistortion of the input signal, and the current source injects the temperature-dependent current into the buffer transistor (Qb2) to adjust the extent of the predistortion and to compensate for the undesirable effects caused by variations in ambient conditions.
摘要翻译：根据本发明的一个实施例的放大器电路（610）包括放大晶体管（QRF），其被配置为放大在放大器晶体管（QRP）的端子处接收的输入信号，以及偏置电路（Rb1，Rb4，C1，具有与用于稳定放大器晶体管的偏置工作点的放大晶体管（QRF）形成电流镜的偏置晶体管（Qb 1）的Qb2，Qb1，Rb3，Rb5，Rb2和ITC）以及耦合的电流源到缓冲晶体管（Qb2），并被配置为产生用于注入缓冲晶体管的温度相关电流。缓冲晶体管（Qb2）通过产生输入信号的预失真来提高放大晶体管（QRF）的线性度，并且电流源将温度依赖电流注入到缓冲晶体管（Qb2）中以调节预失真的程度，以补偿由环境条件变化引起的不良影响。

6. 发明申请

WO2005065423A3 MULTIPROTOCOL RFID READER 审中-公开
标题翻译：多媒体RFID读写器
公开(公告)号：WO2005065423A3
公开(公告)日：2006-09-28
申请号：PCT/US2004044085
申请日：2004-12-29
申请人： WJ COMMUNICATIONS INC , BELLANTONI JOHN V
发明人： BELLANTONI JOHN V
IPC分类号： H04B1/59 , H04B1/40 , H04B7/12
摘要： An RFID reader accessible thorough a personal computer and includes a PC card interface and a controller both operating according to clock signals from a crystal oscillator. The RFID reader further includes a linearized power amplifier modulator in a transmit path, a receive chain capable of demodulating EPCglobal Class_1 and Class_0 signals from RFID tags, and an integrated switching device for selecting one of a plurality of antenna for transmitting or receiving RF signals.
摘要翻译： RFID读写器可通过个人计算机访问，并且包括PC卡接口和控制器，两者均根据晶体振荡器的时钟信号进行操作。 RFID读取器还包括发送路径中的线性化功率放大器调制器，能够解调来自RFID标签的EPCglobal Class_1和Class_0信号的接收链，以及用于选择多个天线之一用于发送或接收RF信号的集成开关设备。

7. 发明申请

WO2005109500A3 SYSTEM AND METHOD FOR SENSITIVITY OPTIMIZATION OF RF RECEIVER USING ADAPTIVE NULLING 审中-公开
标题翻译：使用自适应空闲的射频接收机灵敏度优化的系统和方法
公开(公告)号：WO2005109500A3
公开(公告)日：2006-11-23
申请号：PCT/US2005014656
申请日：2005-04-28
申请人： WJ COMMUNICATIONS INC , BELLANTONI JOHN
发明人： BELLANTONI JOHN
IPC分类号： H04B7/00 , G06K7/00 , H01L23/62
CPC分类号： G06K7/0008
摘要： The present invention provides sensitivity enhancement for a single antenna (280) RFID interrogating device by separately coupling a nulling signal formed using a portion of a transmit signal into a receiver. The phase and amplitude of nulling signal can be adjusted so that the nulling signal cancels that a reflected transmit signal from the antenna, resulting in the small backscattered signal from the distant RFID tag to be more easily detected, and improving the sensitivity of the RFID receiver.
摘要翻译：本发明通过将使用发射信号的一部分形成的归零信号分别耦合到接收器中来为单个天线（280）RFID询问装置提供灵敏度增强。可以调整归零信号的相位和幅度，使得零位信号消除来自天线的反射的发射信号，导致来自远距离RFID标签的小的反向散射信号被更容易地检测，并且提高RFID接收器的灵敏度。

8. 发明申请

WO2006047701A3 DISTRIBUTED RFID INTERROGATION SYSTEM AND METHOD OF OPERATING THE SAME 审中-公开
公开(公告)号：WO2006047701A3
公开(公告)日：2006-05-04
申请号：PCT/US2005/038833
申请日：2005-10-26
申请人： WJ COMMUNICATIONS, INC. , MRAVCA, Jim
发明人： MRAVCA, Jim
IPC分类号： H04Q9/00 , H04L9/00
摘要： A system and method are provided for interrogating passive radio frequency identification (RFID) transponders located in compartmentalized areas such as on shelves or in other spatially-partitioned storage areas. The system includes a controller and a plurality of minimal function RFID readers coupled to the controller via a network-compatible cable. The controller is configured to address a subset of at least one reader at a time to interrogate the RFID transponders located in at least one of the compartmentalized areas. The readers are each give a physical location and a unique address, through which the controller would know the locations of the RFID transponders being interrogated.

9. 发明申请

WO2005101528A2 HETEROJUNCTION BIPOLAR TRANSISTOR HAVING NON-UNIFORMLY DOPED COLLECTOR FOR IMPROVED SAFE-OPERATING AREA 审中-公开
标题翻译：异质结双极晶体管，具有非均匀掺杂收集器，用于改进的安全工作区
公开(公告)号：WO2005101528A2
公开(公告)日：2005-10-27
申请号：PCT/US2005/011641
申请日：2005-04-06
申请人： WJ COMMUNICATIONS, INC. , LEE, Chien, Ping , CHAU, Frank, Hin, Fai , WANG, Nanlei, Larry , DUNNROWICZ, Clarence, John , CHEN, Yan , LIN, Barry, Jia-Fu
发明人： LEE, Chien, Ping , CHAU, Frank, Hin, Fai , WANG, Nanlei, Larry , DUNNROWICZ, Clarence, John , CHEN, Yan , LIN, Barry, Jia-Fu
IPC分类号： H01L31/0328
CPC分类号： H01L29/0821 , H01L29/7371
摘要： The safe-operating area (SOA) in a heterojunction bipolar transistor (HBT) is improved by providing a collector region in the transistor having a graded (continuous or stepped) doping between the base region and the underlying subcollector region with the collector doping being lowest near the base and highest near the subcollector and with the collector doping being less than the doping of the subcollector. The non-uniformly doped collector reduces Kirk effect induced breakdown when collector current increases.
摘要翻译：通过在晶体管中提供集电极区域来改善异质结双极晶体管（HBT）中的安全工作区域（SOA），该集电极区域具有在基极区域和下层之间的渐变（连续或阶梯式）掺杂子集电极区域的集电极掺杂在基极附近最低并且在子集电极附近最高并且集电极掺杂小于子集电极的掺杂。当集电极电流增加时，非均匀掺杂的集电极会降低柯克效应引起的击穿。

10. 发明申请

WO2005065423A2 MULTIPROTOCOL RFID READER 审中-公开
标题翻译：多媒体RFID读写器
公开(公告)号：WO2005065423A2
公开(公告)日：2005-07-21
申请号：PCT/US2004/044085
申请日：2004-12-29
申请人： WJ COMMUNICATIONS, INC. , BELLANTONI, John, V.
发明人： BELLANTONI, John, V.
摘要： An RFID reader accessible thorough a personal computer and includes a PC card interface and a controller both operating according to clock signals from a crystal oscillator. The RFID reader further includes a linearized power amplifier modulator in a transmit path, a receive chain capable of demodulating EPCglobal Class_1 and Class_0 signals from RFID tags, and an integrated switching device for selecting one of a plurality of antenna for transmitting or receiving RF signals.
摘要翻译： RFID读写器可通过个人计算机访问，并且包括PC卡接口和控制器，两者均根据晶体振荡器的时钟信号进行操作。 RFID读取器还包括发送路径中的线性化功率放大器调制器，能够解调来自RFID标签的EPCglobal Class_1和Class_0信号的接收链，以及用于选择多个天线之一用于发送或接收RF信号的集成开关设备。

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