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112 条记录 (耗时 0.028 秒)

    Multi-mode communications transmitter
    7.
    发明授权
    Multi-mode communications transmitter 有权
    多模通信发射机

    公开(公告)号：US07158494B2

    公开(公告)日：2007-01-02

    申请号：US10045199

    申请日：2001-10-22

    申请人： Brian Sander ,  Wendell B. Sander ,  Stephan V. Schell

    发明人： Brian Sander ,  Wendell B. Sander ,  Stephan V. Schell

    IPC分类号： H04Q7/00 ,  H04L23/02

    CPC分类号： H03G3/3047 ,  H04B1/0475 ,  H04L27/0008

    摘要： The present invention, generally speaking, provides for true multi-mode operation enabling mode switching to be done on-the-fly, in real time. Ramping techniques are provided to fully ramp a communications signal down and then back up inside a guard period while switching from one mode to another so that signal glitches occur only while the signal is ramped down and so can be made negligible. In another aspect of the invention, an advantageous multi-mode communications platform having a polar modulation architecture is provided. Preferably, the platform is based on a multi-mode, predominantly digital, single-chip communications signal processor. A digital, phase-stable, frequency lock loop enables versatile, low-power operation.

    摘要翻译： 本发明一般地提供真正的多模式操作，使得能够实时地实时地进行模式切换。 提供斜坡技术以在从一种模式切换到另一种模式的同时将通信信号向下逐渐向下延伸，然后在保护期内备份，从而仅在信号下降并且因此可以忽略不计时发生信号毛刺。 在本发明的另一方面，提供了一种具有极性调制架构的有利的多模式通信平台。 优选地，平台基于多模式，主要是数字的单芯片通信信号处理器。 数字，相位稳定的频率锁定环可实现多功能，低功耗的操作。

    Method and system of amplitude modulation using dual/split channel unequal amplification
    8.
    发明授权
    Method and system of amplitude modulation using dual/split channel unequal amplification 有权
    使用双/分离信道不等式放大的幅度调制方法和系统

    公开(公告)号：US06751265B1

    公开(公告)日：2004-06-15

    申请号：US09661167

    申请日：2000-09-13

    申请人： Stephan V. Schell ,  Wendell B. Sander ,  Earl McCune

    发明人： Stephan V. Schell ,  Wendell B. Sander ,  Earl McCune

    IPC分类号： H03C500

    CPC分类号： H03F1/0294 ,  H03C1/50 ,  H03K7/10 ,  H03K9/10

    摘要： A system and method of amplitude modulation is described in which first and second 180 degrees out-of-phase signals are produced and are each amplified by one of two (different amplification factor) non-linear amplifiers. One of the signals is amplified using constant amplification by a first non-linear amplifier to generate a relatively small amplified signal. The other of the signals is modulated using variable amplification by a second non-linear amplifier to generate a relatively larger amplitude modulated signal. The two resulting 180 degree out-of-phase signals are combined, such that the smaller signal effectively cancels out lower level distortion exhibited by the larger amplitude modulated signal. Alternatively, a symmetrical structure can be used for generating AM signals which include phase reversals of the carrier.

    摘要翻译： 描述了幅度调制的系统和方法，其中产生第一和第二180度异相信号，并且每个信号由两个（不同的放大因子）非线性放大器中的一个放大。 其中一个信号通过第一非线性放大器的恒定放大来放大，以产生相对小的放大信号。 使用第二非线性放大器的可变放大来调制另一个信号以产生相对较大的幅度调制信号。 两个产生的180度异相信号被组合，使得较小的信号有效地抵消由较大幅度调制信号表现出的较低电平失真。 或者，可以使用对称结构来产生包括载波的相位反转的AM信号。

    Differential rf/microwave power amplifier using independent synchronized polar modulators
    9.
    发明授权
    Differential rf/microwave power amplifier using independent synchronized polar modulators 有权
    差分RF /微波功率放大器采用独立同步极化调制器

    公开(公告)号：US06653896B2

    公开(公告)日：2003-11-25

    申请号：US09997743

    申请日：2001-11-30

    申请人： John F. Sevic ,  Wendell B. Sander ,  Stephan V. Schell

    发明人： John F. Sevic ,  Wendell B. Sander ,  Stephan V. Schell

    IPC分类号： H03F338

    CPC分类号： H03F3/602 ,  H03F3/211

    摘要： A first amplified signal is produced at a first amplifier, a second amplified signal is produced at a second amplifier, and a differential signal representing difference between the first amplified signal and the second amplified signal is generated at a subtraction unit receiving the first amplified signal and second amplified signal, the differential signal being a final amplified signal having a final modulated amplitude and a final modulated phase.

    摘要翻译： 在第一放大器产生第一放大信号，在第二放大器产生第二放大信号，并且在接收第一放大信号的减法单元产生表示第一放大信号和第二放大信号之间的差的差分信号， 第二放大信号，差分信号是具有最终调制幅度和最终调制相位的最终放大信号。

    Communications signal amplifiers having independent power control and amplitude modulation
    10.
    发明授权
    Communications signal amplifiers having independent power control and amplitude modulation 失效

    公开(公告)号：US07010276B2

    公开(公告)日：2006-03-07

    申请号：US09834024

    申请日：2001-04-11

    申请人： Wendell B. Sander ,  Ronald A. Meck ,  Earl W. McCune, Jr.

    发明人： Wendell B. Sander ,  Ronald A. Meck ,  Earl W. McCune, Jr.

    IPC分类号： H04B1/02

    CPC分类号： H03F1/0211 ,  H03G3/004 ,  H03G3/3042

    摘要： The present invention, generally speaking, provides methods and apparatus for producing an amplitude modulated communications signal, in which a constant-envelope carrier signal is modified in response to a power control signal to produce a modified constant-envelope carrier signal. The modified constant-envelope carrier signal is amplified in response to an amplitude modulation signal to produce a communications signal having amplitude modulation and having an average output power proportional to a signal level of the modified constant-envelope carrier signal. This manner of operation allows wide dynamic range of average output power to be achieved. Because amplitude modulation is applied after amplitude varying circuitry used to produce the modified constant-envelope carrier signal, the amplitude modulation is unaffected by possible non-linearities of such circuitry. In accordance with another aspect of the invention, operation in the foregoing manner at comparatively low average output power levels is combined with switch mode operation at comparatively high average output power levels, enabling high overall efficiency to be achieved. Hence, the disclosed modulator and amplifier combination, in addition to supporting very low power signals, also supports high power signals.