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1. 发明授权

US08938615B2 System and method for authenticating radio frequency identification (RFID) tags 有权
标题翻译：用于认证射频识别（RFID）标签的系统和方法
公开(公告)号：US08938615B2
公开(公告)日：2015-01-20
申请号：US11852709
申请日：2007-09-10
申请人： Brian Neill , Anthony J. Walters , Randy Tsang
发明人： Brian Neill , Anthony J. Walters , Randy Tsang
IPC分类号： H04L9/32 , H04L9/30
CPC分类号： H04L9/3066 , H04L9/3252 , H04L2209/805
摘要： An authenticated RFID system is provided that uses elliptic curve cryptography (ECC) to reduce the signature size and read/write times when compared to traditional public key implementations such as RSA. Either ECDSA or ECPVS can be used to reduce the signature size and ECPVS can be used to hide a portion of the RFID tag that contains sensitive product identifying information. As a result, smaller tags can be used or multiple signatures can be written at different stages in a manufacturing or supply chain. A key management system is used to distribute the verification keys and aggregate signature schemes are also provided for adding multiple signatures to the RFID tags, for example in a supply chain.
摘要翻译：提供了一种经过认证的RFID系统，与传统的公共密钥实现（如RSA）相比，使用椭圆曲线密码术（ECC）来减少签名大小和读/写时间。 ECDSA或ECPVS可以用于减小签名大小，并且ECPVS可用于隐藏包含敏感产品标识信息的RFID标签的一部分。因此，可以使用较小的标签，或者可以在制造或供应链中的不同阶段写入多个签名。密钥管理系统用于分发验证密钥，并且聚合签名方案也被提供用于向RFID标签添加多个签名，例如在供应链中。

2. 发明授权

US08503503B1 Agile frequency synthesizer scheme for fast hopping, low phase noise applications 有权
标题翻译：用于快速跳频，低相位噪声应用的敏捷频率合成器方案
公开(公告)号：US08503503B1
公开(公告)日：2013-08-06
申请号：US11771944
申请日：2007-06-29
申请人： Randy Tsang , Chun Geik Tan , Yui Lin , Meng Long
发明人： Randy Tsang , Chun Geik Tan , Yui Lin , Meng Long
IPC分类号： H04B1/00
CPC分类号： H04B1/7136 , H04B2001/71365
摘要： A system and method for frequency hopping precalibrates a subset of a plurality of channels, storing the channels' associated curves in a computer readable medium. Before hopping to a new channel, decision making circuitry can access the precalibrated curves. If the destination channel has an associated curve, then the system can use the values from that curve when hopping to a new channel. If the destination channel does not have an associated precalibrated curve, then the system can identify a closely situated channel with a precalibrated curve and use an offset value to settle at the destination channel. According to another aspect of the present invention, the offsets can be updated. According to a further aspect of the invention, the updated can be done dynamically.
摘要翻译：用于跳频的系统和方法预先校准多个信道的子集，将信道的相关曲线存储在计算机可读介质中。在跳到新频道之前，决策电路可以访问预校准的曲线。如果目标通道具有相关联的曲线，则当跳到新通道时，系统可以使用该曲线中的值。如果目的地信道没有相关联的预校准曲线，则系统可以使用预校准曲线识别具有相似位置的信道，并使用偏移值来定位在目的地信道。根据本发明的另一方面，可以更新偏移。根据本发明的另一方面，可以动态地进行更新。

3. 发明授权

US08442451B1 Transmitter and receiver impedence control using shunt switches 有权
标题翻译：使用分流开关的发射机和接收机阻抗控制
公开(公告)号：US08442451B1
公开(公告)日：2013-05-14
申请号：US12827449
申请日：2010-06-30
申请人： Chun-Geik Tan , Randy Tsang , Wayne A. Loeb
发明人： Chun-Geik Tan , Randy Tsang , Wayne A. Loeb
IPC分类号： H04B1/38
CPC分类号： H04B1/525
摘要： Circuits, methods, and apparatus that provide isolation between receive and transmit circuits in a wireless transceiver. One example provides switches that can be included on an integrated circuit with at least portions of a wireless transceiver. These switches vary the impedance of transmitter and receiver circuits between a termination impedance and a high impedance by inserting or removing components in parallel with matching networks. Signal losses are minimized since these switches are shunt connected to input and output paths on the wireless circuit and are not connected directly in either signal path.
摘要翻译：在无线收发器中提供接收和发送电路之间隔离的电路，方法和装置。一个示例提供可以包括在具有无线收发器的至少一部分的集成电路上的开关。这些开关通过与匹配网络并联插入或删除组件来改变发射器和接收器电路在终端阻抗和高阻抗之间的阻抗。信号损耗最小化，因为这些开关分流连接到无线电路上的输入和输出路径，并且不直接连接在任一信号路径中。

4. 发明授权

US08319547B1 Self biased low noise high PSRR constant GM for VCO 有权
标题翻译：用于VCO的自偏置低噪声高PSRR常数GM
公开(公告)号：US08319547B1
公开(公告)日：2012-11-27
申请号：US12694922
申请日：2010-01-27
申请人： Chun-Geik Tan , Randy Tsang , Yonghua Song
发明人： Chun-Geik Tan , Randy Tsang , Yonghua Song
IPC分类号： G05F1/10
CPC分类号： G05F3/24 , H03L1/022 , H03L7/099
摘要： A system and method for voltage controlled oscillator (VCO) biasing in low voltage circuits including low resistance elements that are especially susceptible to noise. In one embodiment, a poly resistor and triode resistor is used to cancel or offset the effects that temperature variations have on the circuit. The triode resistor is powered by a voltage source that uses a pair of diodes coupled to a constant transconductance (gm) circuit to generate a reduced noise voltage that is independent of the power supply noise. The size of the triode resistor and poly resistors can be varied.
摘要翻译：一种用于低压电路中的压控振荡器（VCO）偏置的系统和方法，包括特别容易受噪声影响的低电阻元件。在一个实施例中，使用多电阻和三极管电阻来消除或抵消温度变化对电路的影响。三极管电阻由电压源供电，该电压源使用耦合到恒定跨导（gm）电路的一对二极管来产生独立于电源噪声的降低的噪声电压。三极管电阻和多个电阻的大小可以变化。

5. 发明授权

US07667533B1 Self biased low noise high PSRR constant GM for VCO 失效
标题翻译：用于VCO的自偏置低噪声高PSRR常数GM
公开(公告)号：US07667533B1
公开(公告)日：2010-02-23
申请号：US11586393
申请日：2006-10-24
申请人： Chun-Geik Tan , Randy Tsang , Yonghua Song
发明人： Chun-Geik Tan , Randy Tsang , Yonghua Song
IPC分类号： G05F1/10
CPC分类号： G05F3/24 , H03L1/022 , H03L7/099
摘要： A system and method for voltage controlled oscillator (VCO) biasing in low voltage circuits including low resistance elements that are especially susceptible to noise. In one embodiment, a poly resistor and triode resistor is used to cancel or offset the effects that temperature variations have on the circuit. The triode resistor is powered by a voltage source that uses a pair of diodes coupled to a constant transconductance (gm) circuit to generate a reduced noise voltage that is independent of the power supply noise. The size of the triode resistor and poly resistors can be varied.
摘要翻译：一种低压电路中压控振荡器（VCO）偏置的系统和方法，包括特别容易受噪声影响的低电阻元件。在一个实施例中，使用多电阻和三极管电阻来消除或抵消温度变化对电路的影响。三极管电阻由电压源供电，该电压源使用耦合到恒定跨导（gm）电路的一对二极管来产生独立于电源噪声的降低的噪声电压。三极管电阻和多个电阻的大小可以变化。

6. 发明授权

US07064600B1 Limit swing charge pump and method thereof 失效
标题翻译：限位摆动电荷泵及其方法
公开(公告)号：US07064600B1
公开(公告)日：2006-06-20
申请号：US10703375
申请日：2003-11-07
申请人： Jun Ming , Randy Tsang , Lawrence Tse
发明人： Jun Ming , Randy Tsang , Lawrence Tse
IPC分类号： G05F1/10
CPC分类号： H03L7/0896
摘要： A charge pump comprising a charge pump core including output switches. The charge pump core, in response to a drive signal, to generate a charge pump output. A limit swing generator, in response to an input signal, to generate the drive signal to control the charge pump core. The drive signal having voltage levels including a high level and a low level. The limit swing generator including at least one voltage generator to control the voltage levels of the drive signal such that the drive signal tracks a process variable of the output switches. The at least one voltage generator including at least one diode or diode connected device.
摘要翻译：一种电荷泵，包括包括输出开关的电荷泵芯。电荷泵芯，响应于驱动信号，产生电荷泵输出。极限摆动发生器响应于输入信号，产生驱动信号以控制电荷泵芯。具有包括高电平和低电平的电压电平的驱动信号。限位摆动发生器包括至少一个电压发生器，以控制驱动信号的电压电平，使得驱动信号跟踪输出开关的过程变量。所述至少一个电压发生器包括至少一个二极管或二极管连接的装置。

7. 发明授权

US06819187B1 Limit swing charge pump and method thereof 有权
标题翻译：限位摆动电荷泵及其方法
公开(公告)号：US06819187B1
公开(公告)日：2004-11-16
申请号：US10195047
申请日：2002-07-12
申请人： Jun Ming , Randy Tsang , Lawrence Tse
发明人： Jun Ming , Randy Tsang , Lawrence Tse
IPC分类号： H03L700
CPC分类号： H03L7/0896
摘要： A charge pump comprising a charge pump core including output switches. The charge pump core, in response to a drive signal, to generate a charge pump output. A limit swing generator, in response to an input signal, to generate the drive signal to control the charge pump core. The drive signal having voltage levels including a high level and a low level. The limit swing generator including at least one voltage generator to control the voltage levels of the drive signal such that the drive signal tracks a process variable of the output switches.
摘要翻译：一种电荷泵，包括包括输出开关的电荷泵芯。电荷泵芯，响应于驱动信号，产生电荷泵输出。极限摆动发生器响应于输入信号，产生驱动信号以控制电荷泵芯。具有包括高电平和低电平的电压电平的驱动信号。限位摆动发生器包括至少一个电压发生器，以控制驱动信号的电压电平，使得驱动信号跟踪输出开关的过程变量。

8. 发明授权

US06747520B1 Limit swing charge pump and method thereof 有权
标题翻译：限位摆动电荷泵及其方法
公开(公告)号：US06747520B1
公开(公告)日：2004-06-08
申请号：US10219225
申请日：2002-08-13
申请人： Jun Ming , Randy Tsang , Lawrence Tse
发明人： Jun Ming , Randy Tsang , Lawrence Tse
IPC分类号： H03L700
CPC分类号： H03L7/0896
摘要： A charge pump comprising a charge pump core including output switches. The charge pump core, in response to a drive signal, to generate a charge pump output. A limit swing generator, in response to an input signal, to generate the drive signal to control the charge pump core. The drive signal having voltage levels including a high level and a low level. The limit swing generator including at least one voltage generator to control the voltage levels of the drive signal such that the drive signal tracks a process variable of the output switches. The at least one voltage generator including at least one diode or diode connected device.
摘要翻译：一种电荷泵，包括包括输出开关的电荷泵芯。电荷泵芯，响应于驱动信号，产生电荷泵输出。极限摆动发生器响应于输入信号，产生驱动信号以控制电荷泵芯。具有包括高电平和低电平的电压电平的驱动信号。限位摆动发生器包括至少一个电压发生器，以控制驱动信号的电压电平，使得驱动信号跟踪输出开关的过程变量。所述至少一个电压发生器包括至少一个二极管或二极管连接的装置。

9. 发明授权

US06727736B1 Voltage control oscillator noise reduction technique and method thereof 有权
标题翻译：压控振荡器降噪技术及其方法
公开(公告)号：US06727736B1
公开(公告)日：2004-04-27
申请号：US10226549
申请日：2002-08-23
申请人： Randy Tsang , Shuran Wei
发明人： Randy Tsang , Shuran Wei
IPC分类号： H03L406
CPC分类号： H03L7/0891 , H03L7/093 , H03L7/099
摘要： A phase locked loop including a loop filter to generate a control voltage as a function of an input signal and a. reference voltage. A voltage controlled oscillator (VCO) coupled to the loop filter, includes a varactor having terminals. In response to the control voltage, the VCO generates a periodic output signal having a frequency that is a function of the varactor and the control voltage. The VCO duplicates noise appearing on one of the varactor terminals to another of the varactor terminals so that noise in the periodic output signal is reduced.
摘要翻译：一种锁相环，包括一个环路滤波器，以产生一个作为输入信号的函数的控制电压，参考电压。耦合到环路滤波器的压控振荡器（VCO）包括具有端子的变容二极管。响应于控制电压，VCO产生具有作为变容二极管和控制电压的函数的频率的周期性输出信号。 VCO将出现在其中一个变容二极管端子上的噪声复制到另一个变容二极管端子，使得周期性输出信号中的噪声减小。

10. 发明授权

US08149065B1 Low KVCO phase-locked loop with large frequency drift handling capability 有权
标题翻译：低KVCO锁相环，具有较大的频率漂移处理能力
公开(公告)号：US08149065B1
公开(公告)日：2012-04-03
申请号：US13088645
申请日：2011-04-18
申请人： Randy Tsang , Yu-chi Lee , David Cousinard
发明人： Randy Tsang , Yu-chi Lee , David Cousinard
IPC分类号： H03L7/085
CPC分类号： H03L7/099 , H03L1/02 , H03L7/18
摘要： A phase-locked loop that supports a large frequency drift capability, yet maintains a low Kvco, and does not introduce noise or discontinuities in the frequency of the generated phase-locked loop output signal. The phase-locked loop may include a VCO with an LC tank circuit, the capacitance of which may be adjusted in incremental units. By gradually adjusting a control signal applied to a selected VCO LC tank circuit frequency adjustment control line, e.g., in a continuous ramped function, or time-averaged ramped function, from LOW-to-HIGH or from HIGH-to-LOW, over a period of time that is greater than the response time of the phase-locked loop, a frequency range supported by the VCO may be shifted to either a higher frequency range or a lower frequency range, as needed, to accommodate environmentally induced frequency drift in the VCO, without introducing noise or discontinuities in the frequency of the generated phase-locked loop output signal.
摘要翻译：一个锁相环，支持大的频率漂移能力，但维持低的Kvco，并且不会在产生的锁相环输出信号的频率中引入噪声或不连续性。锁相环可以包括具有LC槽电路的VCO，其电容可以以增量单位调节。通过逐渐调整施加到所选择的VCO LC电路频率调节控制线的控制信号，例如，以连续斜坡功能或时间平均斜坡函数，从低到高或从高到低，通过时间段大于锁相环的响应时间，由VCO支持的频率范围可以根据需要转换到更高的频率范围或更低的频率范围，以适应环境中的频率漂移 VCO，不会在产生的锁相环输出信号的频率中引入噪声或不连续性。

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