公开(公告)号：EP1440510A1

公开(公告)日：2004-07-28

申请号：EP02802073.3

申请日：2002-09-23

申请人： TELEFONAKTIEBOLAGET L M ERICSSON (publ)

发明人： Zhou, Shu-Ang

IPC分类号： H03H7/30

CPC分类号： H03H17/0009

摘要： In the present invention a multi-bit time-delay adjuster using Radio Frequency (RF) MicroElectroMechanical (MEM) switches is disclosed for applications in MCPAs with feed-forward linearization technique. The MEM switching system used in the multi-bit time-delay adjuster makes it possible to automatic control the time-delay match with very high precision required in feed-forward MultiCarrier Power Amplifiers (MCPA), instead of a manual trimming process. A searching process suitable for the automatic control of time-delay match is also introduced and demonstrated by an example of a four-bit time-delay adjuster.

公开(公告)号：EP1158659A1

公开(公告)日：2001-11-28

申请号：EP00850083.7

申请日：2000-05-15

申请人： Telefonaktiebolaget L M Ericsson (Publ)

发明人： Zhou, Shu-Ang

IPC分类号： H03C7/02

CPC分类号： H03C7/027

摘要： The invention is mainly related to the use of power amplifiers and modulators in e.g. radio communications systems, and more particularly to the use of switching-mode power amplifiers at high carrier frequencies. A new radio transmitter architecture is provided that is different from that of the conventional radio transmitters that uses an AC carrier signal of constant amplitude and phase. To realise this new radio transmitter, a novel device is proposed based on the following features: the use of switchable bandpass filters to implement digital modulation directly on the AC, RF frequency, carrier wave. This direct modulation may eliminate some undesired non-linear effects, such as intermodulation products which may appear in a conventional RF power amplifier. A signal source is used to control an RF switch realised as e.g. a semiconductor or a Josephson junction, among others, depending on the modulation frequency. A low-pass, or band-pass filter is provided. This filter can be switched, thereby amplitude modulating the AC voltage source as it passes through the filter. A preferred embodiment consists of a planar microstrip element having a patterned electrically conducting layer. The patterned layer forms a transmission or propagation path for the signal, the path having a central path with lateral strips separated by windows from the central path. These lateral paths have regions which allow them to be controlled by the control signal, thereby performing the switching function.

摘要翻译： 本发明主要涉及功率放大器和调制器的使用。 无线电通信系统，更具体地涉及在高载波频率下使用开关模式功率放大器。 提供了与使用恒定幅度和相位的交流载波信号的常规无线电发射机不同的新的无线电发射机架构。 为了实现这种新的无线电发射机，提出了一种基于以下特点的新型设备：使用可切换带通滤波器直接在AC，RF频率，载波上实现数字调制。 这种直接调制可以消除一些不期望的非线性效应，例如可能出现在常规RF功率放大器中的互调产物。 信号源用于控制例如实现的RF开关。 半导体或约瑟夫逊结等，取决于调制频率。 提供低通或带通滤波器。 可以切换该滤波器，从而在交流电压源通过滤波器时对其进行幅度调制。 优选实施例由具有图案化导电层的平面微带线元件组成。 图案层形成信号的透射或传播路径，该路径具有带有与中心路径相连的窗口的侧向条带的中心路径。 这些横向路径具有允许其由控制信号控制的区域，从而执行切换功能。