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1. 发明申请

US20090153244A1 LOW NOISE AND LOW INPUT CAPACITANCE DIFFERENTIAL MDS LNA 有权
标题翻译：低噪声和低输入电容差分MDS LNA
公开(公告)号：US20090153244A1
公开(公告)日：2009-06-18
申请号：US11959196
申请日：2007-12-18
申请人： Jose Cabanillas , Prasad S. Gudem , Namsoo Kim , Cristian Marcu , Anup Savla
发明人： Jose Cabanillas , Prasad S. Gudem , Namsoo Kim , Cristian Marcu , Anup Savla
IPC分类号： H03F3/45
CPC分类号： H03F3/45188 , H03F1/3205 , H03F1/3211 , H03F2203/45318 , H03F2203/45396
摘要： A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmetrical and cross-coupled fashion. The main transistors are source degenerated. Because the gates of cancel transistors are not coupled to the differential input leads of the LNA, the input capacitance of the LNA is reduced. Noise introduced into the LNA output due to the cancel transistors being biased in the sub-threshold region is reduced because there are two stages. The first stage involves the main transistors, and the second stage involves the cancel transistors. By increasing the gain of the first stage and decreasing the gain of the second stage, overall LNA gain is maintained while reducing the noise that the sub-threshold biased transistors contribute to the LNA output.
摘要翻译：差分低噪声放大器（LNA）涉及两个偏置饱和的主放大晶体管，两个取消晶体管偏置为次阈值。在一个示例中，取消晶体管的栅极以对称和交叉耦合的方式耦合到主晶体管的漏极。主晶体管是源极退化的。因为取消晶体管的栅极没有耦合到LNA的差分输入引线，所以LNA的输入电容减小。由于存在两个阶段，由于在子阈值区域偏置的取消晶体管而导入到LNA输出中的噪声被减小。第一级涉及主晶体管，第二级涉及取消晶体管。通过增加第一级的增益并降低第二级的增益，保持整体LNA增益，同时降低子阈值偏置晶体管对LNA输出有贡献的噪声。

2. 发明授权

US07944298B2 Low noise and low input capacitance differential MDS LNA 有权
标题翻译：低噪声和低输入电容差分MDS LNA
公开(公告)号：US07944298B2
公开(公告)日：2011-05-17
申请号：US11959196
申请日：2007-12-18
申请人： Jose Cabanillas , Prasad S. Gudem , Namsoo Kim , Cristian Marcu , Anup Savla
发明人： Jose Cabanillas , Prasad S. Gudem , Namsoo Kim , Cristian Marcu , Anup Savla
IPC分类号： H03F3/45
CPC分类号： H03F3/45188 , H03F1/3205 , H03F1/3211 , H03F2203/45318 , H03F2203/45396
摘要： A differential low noise amplifier (LNA) involves two main amplifying transistors biased in saturation, and two cancel transistors biased in sub-threshold. In one example, the gates of the cancel transistors are coupled to the drains of main transistors, in a symmetrical and cross-coupled fashion. The main transistors are source degenerated. Because the gates of cancel transistors are not coupled to the differential input leads of the LNA, the input capacitance of the LNA is reduced. Noise introduced into the LNA output due to the cancel transistors being biased in the sub-threshold region is reduced because there are two stages. The first stage involves the main transistors, and the second stage involves the cancel transistors. By increasing the gain of the first stage and decreasing the gain of the second stage, overall LNA gain is maintained while reducing the noise that the sub-threshold biased transistors contribute to the LNA output.
摘要翻译：差分低噪声放大器（LNA）涉及两个偏置饱和的主放大晶体管，两个取消晶体管偏置为次阈值。在一个示例中，取消晶体管的栅极以对称和交叉耦合的方式耦合到主晶体管的漏极。主晶体管是源极退化的。因为取消晶体管的栅极没有耦合到LNA的差分输入引线，所以LNA的输入电容减小。由于存在两个阶段，由于在子阈值区域偏置的取消晶体管而导入到LNA输出中的噪声被减小。第一级涉及主晶体管，第二级涉及取消晶体管。通过增加第一级的增益并降低第二级的增益，保持整体LNA增益，同时降低子阈值偏置晶体管对LNA输出有贡献的噪声。

3. 发明申请

US20130109304A1 ADAPTIVE SIGNAL SCALING IN NFC TRANSCEIVERS 有权
标题翻译： NFC收发机中的自适应信号调整
公开(公告)号：US20130109304A1
公开(公告)日：2013-05-02
申请号：US13282328
申请日：2011-10-26
申请人： Cristian Marcu , Jafar Savoj
发明人： Cristian Marcu , Jafar Savoj
IPC分类号： H04B5/02
CPC分类号： G06K7/0008 , G06K19/0723
摘要： Exemplary embodiments are directed to adaptive signal scaling in NFC transceivers. A transceiver may include a programmable load modulation element configured for load modulation in a tag mode. Further, the transceiver may include a sensing element for measuring an amount of power harvested by the transceiver in the tag mode. The transceiver may also include a controller configured for adjusting a depth of load modulation of the programmable load modulation element depending on the amount of power harvested.
摘要翻译：示例性实施例涉及NFC收发器中的自适应信号缩放。收发器可以包括被配置用于以标签模式进行负载调制的可编程负载调制元件。此外，收发器可以包括感测元件，用于测量在标签模式中由收发器收获的功率的量。收发器还可以包括控制器，该控制器被配置为根据收集的功率量来调整可编程负载调制元件的负载调制深度。

4. 发明授权

US09384373B2 Adaptive signal scaling in NFC transceivers 有权
标题翻译： NFC收发器中的自适应信号缩放
公开(公告)号：US09384373B2
公开(公告)日：2016-07-05
申请号：US13282328
申请日：2011-10-26
申请人： Cristian Marcu , Jafar Savoj
发明人： Cristian Marcu , Jafar Savoj
IPC分类号： H04B5/00 , G06K7/00 , G06K19/07
CPC分类号： G06K7/0008 , G06K19/0723
摘要： Exemplary embodiments are directed to adaptive signal scaling in NFC transceivers. A transceiver may include a programmable load modulation element configured for load modulation in a tag mode. Further, the transceiver may include a sensing element for measuring an amount of power harvested by the transceiver in the tag mode. The transceiver may also include a controller configured for adjusting a depth of load modulation of the programmable load modulation element depending on the amount of power harvested.
摘要翻译：示例性实施例涉及NFC收发器中的自适应信号缩放。收发器可以包括被配置用于以标签模式进行负载调制的可编程负载调制元件。此外，收发器可以包括感测元件，用于测量在标签模式中由收发器收获的功率的量。收发器还可以包括控制器，该控制器被配置为根据收集的功率量来调整可编程负载调制元件的负载调制深度。

5. 发明申请

US20120083205A1 NFC DEVICE HAVING A DIFFERENTIAL INPUT ENVELOPE DETECTOR 审中-公开
标题翻译：具有差分输入包络检测器的NFC设备
公开(公告)号：US20120083205A1
公开(公告)日：2012-04-05
申请号：US12897520
申请日：2010-10-04
申请人： Cristian Marcu , Jafar Savoj
发明人： Cristian Marcu , Jafar Savoj
IPC分类号： H04B5/00 , H01P11/00 , H05K13/00 , H03D1/00
CPC分类号： H03D3/00 , G06K7/0008 , G06K7/10237 , G06K19/0723 , Y10T29/49016 , Y10T29/49117
摘要： A differential input envelope detector receives an unamplified Near Field Communication (NFC) input signal from an NFC antenna and downconverts an NFC intelligence signal to baseband. In one example, the NFC input signal includes the NFC intelligence signal modulated onto a carrier. The differential input envelope detector downconverts and outputs the downconverted NFC intelligence signal onto an output node in such a way that the fundamental and odd harmonics of the carrier are canceled on the output node. There is substantially no signal of the frequency of the carrier present on the output node and this facilitates filtering of the downconverted NFC intelligence signal from interference and data recovery. An NFC data recovery circuit receives the downconverted NFC intelligence signal from the envelope detector output node. The NFC data recovery circuit can be a low power digital circuit involving an ultra-low power ADC and subsequent low power digital processing circuitry.
摘要翻译：差分输入包络检测器从NFC天线接收未放大的近场通信（NFC）输入信号，并将NFC智能信号下变频到基带。在一个示例中，NFC输入信号包括调制到载波上的NFC智能信号。差分输入包络检测器将下变频的NFC智能信号下变频并输出到输出节点上，使得在输出节点上消除载波的基波和奇次谐波。输出节点上基本上没有存在载波频率的信号，这有助于滤波下变频NFC智能信号的干扰和数据恢复。 NFC数据恢复电路从包络检测器输出节点接收经下变频的NFC智能信号。 NFC数据恢复电路可以是涉及超低功率ADC和随后的低功率数字处理电路的低功率数字电路。

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