公开(公告)号：US20090122909A1

公开(公告)日：2009-05-14

申请号：US12268113

申请日：2008-11-10

申请人： Florian Pivit ,  Jan Hesselbarth ,  Georg Fischer ,  Suramate Chalermwisutkul

发明人： Florian Pivit ,  Jan Hesselbarth ,  Georg Fischer ,  Suramate Chalermwisutkul

IPC分类号： H04L27/00

CPC分类号： H04L25/03828 ,  H03F3/2171 ,  H03F3/245 ,  H04L27/00

摘要： The invention concerns a radio frequency transmitter (RFT) and a method of amplifying a radio frequency input signal (SIN) in the radio frequency transmitter (RFT). The radio frequency transmitter (RFT) comprises a digital signal generator (DSG) with a generation unit (GU) adapted to generate a pulsed bit stream signal and a switch mode power amplifier (SMPA) with a transistor circuit (PT) adapted to amplify the radio frequency input signal (SIN). The digital signal generator (DSG) further comprises a control unit (CU) adapted to detect in said pulsed bit stream signal a sequence of a constant signal height longer than a predefined threshold. The control unit (CU) is also adapted to initiate, upon detection of said sequence, a generation of a modified pulsed bit stream signal by an insertion of one or more notches in said sequence. Said notches interrupt said sequence by a signal of a signal height different from the signal height of the sequence. The radio frequency transmitter (RFT) further comprises connecting means (CM) adapted to provide said transistor circuit (PT) with said modified pulsed bit stream signal as the radio frequency input signal (SIN).

摘要翻译： 本发明涉及射频发射机（RFT）和放大射频发射机（RFT）中射频输入信号（SIN）的方法。 射频发射机（RFT）包括具有适于产生脉冲比特流信号的生成单元（GU）的数字信号发生器（DSG）和具有适于放大所述脉冲位流信号的晶体管电路（PT）的开关模式功率放大器（SMPA） 射频输入信号（SIN）。 数字信号发生器（DSG）还包括适于在所述脉冲比特流信号中检测长于预定阈值的恒定信号高度的序列的控制单元（CU）。 控制单元（CU）还适于在检测到所述序列时通过在所述序列中插入一个或多个凹口来发起修改的脉冲比特流信号的产生。 所述缺口通过与序列的信号高度不同的信号高度的信号来中断所述序列。 射频发射机（RFT）还包括适于向所述晶体管电路（PT）提供所述修改的脉冲比特流信号作为射频输入信号（SIN）的连接装置（CM）。