公开(公告)号：US08355752B2

公开(公告)日：2013-01-15

申请号：US12610600

申请日：2009-11-02

申请人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H04M1/00 ,  H04B1/16 ,  H04B7/00 ,  H04B1/10

CPC分类号： H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

摘要： A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.

摘要翻译： 蜂窝电话包括蜂窝电话电路和FM接收机。 接收的FM信号由混频器下变频。 处理下变频信号以产生提供给数字IF滤波器的FM信号。 如果使用蜂窝电话线路发射的阻塞器将干扰由于LO谐波与阻塞器的相互作用而导致的FM信号的接收，如果使用常规LO频率，则使用不同的LO频率。 下变频FM信号的后续处理（例如，通过数字复共轭选择器和IF旋转器）导致提供给数字IF滤波器的信号具有与数字IF滤波器相同的中心频率，尽管使用不同的LO频率 。 在一些实施例中，根据蜂窝电话模式和FM信号，LO偏移不同的量。

公开(公告)号：US20110009161A1

公开(公告)日：2011-01-13

申请号：US12610600

申请日：2009-11-02

申请人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Pushp Trikha ,  Luca Blessent ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H04W92/02

CPC分类号： H04B1/1036 ,  H04B1/14 ,  H04B1/3805 ,  H04B15/04

摘要： A cellular telephone includes cellular telephone circuitry and an FM receiver. An FM signal being received is downconverted by a mixer. The downconverted signal is processed to generate an FM signal that is supplied to a digital IF filter. If a blocker emitted by the cellular telephone circuitry would interfere with receiving of the FM signal due to interaction of an LO harmonic with the blocker if a conventional LO frequency were used, then a different LO frequency is used. Subsequent processing of the downconverted FM signal (for example, by a digital complex conjugate selector and an IF rotator) results in the signal supplied to the digital IF filter having the same center frequency as the digital IF filter despite the use of the different LO frequency. In some embodiments, the LO is shifted by different amounts depending on cellular telephone mode and on the FM signal.

摘要翻译： 蜂窝电话包括蜂窝电话电路和FM接收机。 接收的FM信号由混频器下变频。 处理下变频信号以产生提供给数字IF滤波器的FM信号。 如果使用蜂窝电话线路发射的阻塞器将干扰由于LO谐波与阻塞器的相互作用而导致的FM信号的接收，如果使用常规LO频率，则使用不同的LO频率。 下变频FM信号的后续处理（例如，通过数字复共轭选择器和IF旋转器）导致提供给数字IF滤波器的信号具有与数字IF滤波器相同的中心频率，尽管使用不同的LO频率 。 在一些实施例中，根据蜂窝电话模式和FM信号，LO偏移不同的量。

公开(公告)号：US20120206208A1

公开(公告)日：2012-08-16

申请号：US13370146

申请日：2012-02-09

申请人： Yi Zeng ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Yi Zeng ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H03F1/26

CPC分类号： H03F1/0205 ,  H01B3/004 ,  H03F1/26 ,  H03F1/42 ,  H03F3/195 ,  H03F3/211 ,  H03F3/347 ,  H03F2200/294 ,  H03F2200/36 ,  H03F2200/372 ,  H03F2200/451

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20110193635A1

公开(公告)日：2011-08-11

申请号：US12796593

申请日：2010-06-08

申请人： Yi Zeng ,  Xiaoyong Li ,  Rahul A. Apte

发明人： Yi Zeng ,  Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H03F3/04 ,  H03F1/26

CPC分类号： H03F1/0205 ,  H01B3/004 ,  H03F1/26 ,  H03F1/42 ,  H03F3/195 ,  H03F3/211 ,  H03F3/347 ,  H03F2200/294 ,  H03F2200/36 ,  H03F2200/372 ,  H03F2200/451

摘要： 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.

摘要翻译： 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。

公开(公告)号：US20100237942A1

公开(公告)日：2010-09-23

申请号：US12407704

申请日：2009-03-19

申请人： Xiaoyong Li ,  Rahul A. Apte

发明人： Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H03F3/45

CPC分类号： H03F3/193 ,  H03F1/26 ,  H03F3/3022 ,  H03F3/45179

摘要： Techniques for integrating a common-source and common-gate amplifier topology in a single amplifier design. In one aspect, an input voltage is provided to both a common-source amplifier and a common-gate amplifier. The output voltages of the common-source amplifier and the common-gate amplifier are provided to a difference block for generating a single-ended voltage proportional to the difference between the output voltages. When applied to the design of, e.g., low-noise amplifiers (LNA's), the disclosed techniques may offer improved noise performance over the prior art.

摘要翻译： 用于在单个放大器设计中集成公共源和公共门放大器拓扑的技术。 在一个方面，输入电压被提供给共源放大器和公共门放大器。 共源极放大器和公共栅极放大器的输出电压被提供给差分块，用于产生与输出电压之间的差成比例的单端电压。 当应用于例如低噪声放大器（LNA's）的设计时，所公开的技术可以提供比现有技术更好的噪声性能。

公开(公告)号：US07902923B2

公开(公告)日：2011-03-08

申请号：US12407704

申请日：2009-03-19

申请人： Xiaoyong Li ,  Rahul A. Apte

发明人： Xiaoyong Li ,  Rahul A. Apte

IPC分类号： H03F3/68

CPC分类号： H03F3/193 ,  H03F1/26 ,  H03F3/3022 ,  H03F3/45179

摘要： Techniques for integrating a common-source and common-gate amplifier topology in a single amplifier design. In one aspect, an input voltage is provided to both a common-source amplifier and a common-gate amplifier. The output voltages of the common-source amplifier and the common-gate amplifier are provided to a difference block for generating a single-ended voltage proportional to the difference between the output voltages. When applied to the design of, e.g., low-noise amplifiers (LNA's), the disclosed techniques may offer improved noise performance over the prior art.

摘要翻译： 用于在单个放大器设计中集成公共源和公共门放大器拓扑的技术。 在一个方面，输入电压被提供给共源放大器和公共门放大器。 共源极放大器和公共栅极放大器的输出电压被提供给差分块，用于产生与输出电压之间的差成比例的单端电压。 当应用于例如低噪声放大器（LNA's）的设计时，所公开的技术可以提供比现有技术更好的噪声性能。