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    Method and architecture for dual-mode linear and saturated power amplifier operation
    1.
    发明申请
    Method and architecture for dual-mode linear and saturated power amplifier operation 有权
    双模线性和饱和功率放大器操作的方法和架构

    公开(公告)号：US20050135502A1

    公开(公告)日：2005-06-23

    申请号：US10740238

    申请日：2003-12-17

    申请人： Andrew Zhang ,  Thomas Apel ,  Christopher Stephens

    发明人： Andrew Zhang ,  Thomas Apel ,  Christopher Stephens

    IPC分类号： H03G3/30 ,  H04B20060101 ,  H04B7/005 ,  H04K1/02

    CPC分类号： H03F1/0261 ,  H03F1/02 ,  H03F3/24 ,  H03G3/3047 ,  H04B2001/045 ,  H04W52/38 ,  H04W52/52

    摘要： An RF transmitter provides both GSM and EDGE capability by implementing collector voltage control over the power transistor(s) in a power amplifier. During EDGE mode, linear base-biasing a power amplifier (PA) allows collector control to provide either saturated mode PA operation (during ramp up/ramp down) or linear mode PA operation (during data burst). Collector control can therefore be used to provide the accurate ramp up and ramp down profiles required for both GSM and EDGE burst output signals, and can also be used to set the level of the constant envelope data burst of a GSM burst output signal, while linear mode PA operation can provide the non-constant envelope EDGE data burst. A variable gain amplifier is used to adjust the input signal to the power amplifier such that the desired transmission level is achieved.

    摘要翻译： RF发射器通过在功率放大器中的功率晶体管上实现集电极电压控制来提供GSM和EDGE能力。 在EDGE模式下，功率放大器（PA）的线性基极偏置允许集电极控制提供饱和模式PA操作（斜坡上升/斜降）或线性模式PA操作（数据突发期间）。 因此，收集器控制可用于提供GSM和EDGE突发输出信号所需的准确的上升和下降曲线，并且还可用于设置GSM突发输出信号的恒定包络数据突发的电平，而线性 模式PA操作可以提供非恒定包络边缘数据突发。 可变增益放大器用于调整到功率放大器的输入信号，从而实现所需的传输电平。

    Frequency plan
    4.
    发明授权
    Frequency plan 失效

    公开(公告)号：US06671500B2

    公开(公告)日：2003-12-30

    申请号：US09823680

    申请日：2001-03-30

    申请人： Morten Damgaard ,  Alyosha C. Molnar ,  Rahul Magoon ,  William J. Domino ,  Andrew Zhang

    发明人： Morten Damgaard ,  Alyosha C. Molnar ,  Rahul Magoon ,  William J. Domino ,  Andrew Zhang

    IPC分类号： H04B104

    CPC分类号： H03D7/163 ,  H03L7/185 ,  H03L7/1974 ,  H04B1/403

    摘要： A system is disclosed for transmitting and receiving signals. The system includes the use of a frequency plan table a system for creating the frequency plan table. The frequency plan table relates carrier frequency channels to the operation of a synthesizer and a plurality of programmable frequency dividers in a locked loop. In a transmitter, a first programmable frequency divider accepts a reference signal and produces a comparison signal. A mixer accepts the reference signal and a transmission signal and produces a loop signal. A second programmable frequency divider accepts the loop signal and produces a loop signal having a divided intermediate frequency signal. A phase detector compares the comparison signal and the loop signal having a divided intermediate frequency and produces an output that controls a variable controlled oscillator. The variable controlled oscillator produces a modulated transmission signal.

    ANTENNA STRUCTURE FOR A NEAR-FIELD COMMUNICATION DEVICE
    5.
    发明申请
    ANTENNA STRUCTURE FOR A NEAR-FIELD COMMUNICATION DEVICE 有权
    用于近场通信设备的天线结构

    公开(公告)号：US20120282857A1

    公开(公告)日：2012-11-08

    申请号：US13102134

    申请日：2011-05-06

    申请人： Andrew Zhang

    发明人： Andrew Zhang

    IPC分类号： H04B5/00 ,  H04B7/00

    CPC分类号： H04B5/0037 ,  H04B5/0031 ,  H04B5/0068 ,  H04B5/0081

    摘要： A near field communication (NFC) communicator includes a housing, an NFC controller and an antenna circuit located in the housing. The antenna circuit enable inductive coupling of a near field electromagnetic signal with another antenna circuit in near field range. The antenna circuit includes an antenna element to generate the electromagnetic signal. The communicator also includes a receiver circuit located in the housing for extracting data from modulation induced in the electromagnetic signal which is caused by the inductive coupling of the near field electromagnetic signal with another antenna circuit, a transmitter circuit to generate the near field, a load modulator to modulate the near field to the reader and an energy harvesting circuit to power the rest of the circuit from the external field. A ferrite sheet is located in the housing such that a gap is maintained between the antenna element and the ferrite sheet.

    摘要翻译： 近场通信（NFC）通信器包括壳体，NFC控制器和位于壳体中的天线电路。 天线电路使近场电磁信号与近场范围内的另一天线电路的电感耦合。 天线电路包括用于产生电磁信号的天线元件。 通信器还包括位于壳体中的接收器电路，用于从电磁信号中引起的调制中提取数据，这是由近场电磁信号与另一天线电路的电感耦合引起的，用于产生近场的发射机电路，负载 调制器以将近场调制到读取器和能量收集电路，以从外部场向其余电路供电。 铁氧体片位于壳体中，从而在天线元件和铁氧体片之间保持间隙。

    Method and architecture for dual-mode linear and saturated power amplifier operation
    6.
    发明授权
    Method and architecture for dual-mode linear and saturated power amplifier operation 有权
    双模线性和饱和功率放大器操作的方法和架构

    公开(公告)号：US07177370B2

    公开(公告)日：2007-02-13

    申请号：US10740238

    申请日：2003-12-17

    申请人： Andrew Zhang ,  Thomas R. Apel ,  Christopher R. Stephens

    发明人： Andrew Zhang ,  Thomas R. Apel ,  Christopher R. Stephens

    IPC分类号： H04K1/02 ,  H04L25/03 ,  H04L25/49

    CPC分类号： H03F1/0261 ,  H03F1/02 ,  H03F3/24 ,  H03G3/3047 ,  H04B2001/045 ,  H04W52/38 ,  H04W52/52

    摘要： An RF transmitter provides both GSM and EDGE capability by implementing collector voltage control over the power transistor(s) in a power amplifier. During EDGE mode, linear base-biasing a power amplifier (PA) allows collector control to provide either saturated mode PA operation (during ramp up/ramp down) or linear mode PA operation (during data burst). Collector control can therefore be used to provide the accurate ramp up and ramp down profiles required for both GSM and EDGE burst output signals, and can also be used to set the level of the constant envelope data burst of a GSM burst output signal, while linear mode PA operation can provide the non-constant envelope EDGE data burst. A variable gain amplifier is used to adjust the input signal to the power amplifier such that the desired transmission level is achieved.

    摘要翻译： RF发射器通过在功率放大器中的功率晶体管上实现集电极电压控制来提供GSM和EDGE能力。 在EDGE模式下，功率放大器（PA）的线性基极偏置允许集电极控制提供饱和模式PA操作（斜坡上升/斜降）或线性模式PA操作（数据突发期间）。 因此，收集器控制可用于提供GSM和EDGE突发输出信号所需的准确的上升和下降曲线，并且还可用于设置GSM突发输出信号的恒定包络数据突发的电平，而线性 模式PA操作可以提供非恒定包络边缘数据突发。 可变增益放大器用于调整到功率放大器的输入信号，从而实现所需的传输电平。

    Method and apparatus for extending a VCO tuning range
    7.
    发明授权
    Method and apparatus for extending a VCO tuning range 有权
    扩展VCO调谐范围的方法和装置

    公开(公告)号：US06204734B1

    公开(公告)日：2001-03-20

    申请号：US09498378

    申请日：2000-02-03

    申请人： Andrew Zhang ,  Roy H. Fladager

    发明人： Andrew Zhang ,  Roy H. Fladager

    IPC分类号： H03B512

    CPC分类号： H03B5/1231 ,  H03B5/1212 ,  H03B5/1243 ,  H03B2201/0208

    摘要： Method and apparatus for extending a VCO tuning range. A shunt inductance connected in parallel with a varactor reduces the effective capacitance of the varactor and increases the capacitance ratio. This increases the VCO tuning range without increasing the tuning sensitivity variation and the phase noise.

    摘要翻译： 扩展VCO调谐范围的方法和装置。 与变容二极管并联连接的并联电感降低了变容二极管的有效电容并增加了电容比。 这增加了VCO调谐范围，而不增加调谐灵敏度变化和相位噪声。

    Antenna structure for a near-field communication device
    8.
    发明授权
    Antenna structure for a near-field communication device 有权
    用于近场通信设备的天线结构

    公开(公告)号：US09002264B2

    公开(公告)日：2015-04-07

    申请号：US13102134

    申请日：2011-05-06

    申请人： Andrew Zhang

    发明人： Andrew Zhang

    IPC分类号： H04B5/00 ,  H04M1/00 ,  G08B5/22 ,  H04Q1/30 ,  G05B11/01 ,  G08C19/16

    CPC分类号： H04B5/0037 ,  H04B5/0031 ,  H04B5/0068 ,  H04B5/0081

    摘要： A near field communication (NFC) communicator includes a housing, an NFC controller and an antenna circuit located in the housing. The antenna circuit enable inductive coupling of a near field electromagnetic signal with another antenna circuit in near field range. The antenna circuit includes an antenna element to generate the electromagnetic signal. The communicator also includes a receiver circuit located in the housing for extracting data from modulation induced in the electromagnetic signal which is caused by the inductive coupling of the near field electromagnetic signal with another antenna circuit, a transmitter circuit to generate the near field, a load modulator to modulate the near field to the reader and an energy harvesting circuit to power the rest of the circuit from the external field. A ferrite sheet is located in the housing such that a gap is maintained between the antenna element and the ferrite sheet.

    摘要翻译： 近场通信（NFC）通信器包括壳体，NFC控制器和位于壳体中的天线电路。 天线电路使近场电磁信号与近场范围内的另一天线电路的电感耦合。 天线电路包括用于产生电磁信号的天线元件。 通信器还包括位于壳体中的接收器电路，用于从电磁信号中引起的调制中提取数据，这是由近场电磁信号与另一天线电路的电感耦合引起的，用于产生近场的发射机电路，负载 调制器以将近场调制到读取器和能量收集电路，以从外部场向其余电路供电。 铁氧体片位于壳体中，从而在天线元件和铁氧体片之间保持间隙。