-
公开(公告)号：EP0390356A3
公开(公告)日：1991-09-25
申请号：EP90302482.6
申请日：1990-03-08
IPC分类号： H03K6/04
摘要： The invention relates to the forming of a control pulse, for the transmitter in a GSM radio telephone system. A cos² pulse is formed by means of an analog circuit from a rectangular pulse which is first shaped into a triangular pulse which may be somewhat clipped at its peak. The triangular pulse is further shaped into a cos² pulse. The circuit also includes means (Cr...CN; R14...RN; Q7...QN) by using which the abruptness of the triangular pulse and thereby the abruptness of the cos² pulse can be selected.
-
2.发明公开Circuit for forming low power levels in a transmitter of a radio telephone 失效用于在无线电话的发射机中形成低功率电平的电路
公开(公告)号：EP0397401A2
公开(公告)日：1990-11-14
申请号：EP90304840.3
申请日：1990-05-03
CPC分类号： H03G3/3042 , H04B2001/0416
摘要： The present invention concerns a circuit for forming low power levels in a transmitter of a radio telephone. By a power amplifier (1) of the transmitter is formed the maximum power level and a plurality of lower power levels. As taught by the invention, very low power levels can be produced by controling the power of the RF signal leaking through the power amplifier (1) when said signal is not amplified by the power amplifier. For controlling the leakage power, a PIN diode attenuator (4) connected before the power amplifier (1) is used.
摘要翻译： 本发明涉及用于在无线电话的发射机中形成低功率电平的电路。 发射机的功率放大器（1）形成最大功率电平和多个较低功率电平。 如本发明所教导的，当所述信号未被功率放大器放大时，通过控制通过功率放大器（1）泄漏的RF信号的功率，可以产生非常低的功率电平。 为了控制泄漏功率，使用在功率放大器（1）之前连接的PIN二极管衰减器（4）。
-
3.发明公开
公开(公告)号：EP0397445A3
公开(公告)日：1992-01-15
申请号：EP90304937.7
申请日：1990-05-08
CPC分类号： H03G3/3042 , H03F2203/7239 , H04B2001/0416
摘要： The present invention concerns a procedure for forming low power levels in a radio telephone transmitter in which high power levels are produced in a controllable amplifier stage (1), for instance in a class-C power amplifier. According to the procedure, a RF signal is before the amplifier stage (1) divided into two branches in a power divider (4), in one of which the Rf signal is conducted to said amplifier stage (1) for forming high power levels, and in the other branch the RF signal is conducted to an element (5) by which low power levels are produced, and said branches are combined in the output (RFout) of the transmitter. The element (5) is e.g. a PIN diode attenuator.
-
4.发明公开Procedure for forming low power levels in a radio telephone transmitter 失效在einem Funktelefonsender的Schaltung zur Bildung niedriger Leistungspegel。
公开(公告)号：EP0397445A2
公开(公告)日：1990-11-14
申请号：EP90304937.7
申请日：1990-05-08
CPC分类号： H03G3/3042 , H03F2203/7239 , H04B2001/0416
摘要： The present invention concerns a procedure for forming low power levels in a radio telephone transmitter in which high power levels are produced in a controllable amplifier stage (1), for instance in a class-C power amplifier. According to the procedure, a RF signal is before the amplifier stage (1) divided into two branches in a power divider (4), in one of which the Rf signal is conducted to said amplifier stage (1) for forming high power levels, and in the other branch the RF signal is conducted to an element (5) by which low power levels are produced, and said branches are combined in the output (RFout) of the transmitter. The element (5) is e.g. a PIN diode attenuator.
摘要翻译： 本发明涉及在无线电话发射机中形成低功率电平的过程，其中在可控放大器级（1）中产生高功率电平，例如在C类功率放大器中。 根据该过程，RF信号在功率分配器（4）中被分成两个分支的放大器级（1）之前，其中一个RF信号被传导到所述放大器级（1）以形成高功率电平， 并且在另一分支中，RF信号被传导到产生低功率电平的元件（5），并且所述分支被组合在发射器的输出（RFout）中。 元件（5）是例如。 一个PIN二极管衰减器。
-
公开(公告)号：EP0397311A2
公开(公告)日：1990-11-14
申请号：EP90303102.9
申请日：1990-03-22
CPC分类号： G01R21/01
摘要： The present invention concerns a circuit by the aid of which the power (Pin) emitted from the RF power sensor (SK) of a radio telephone is processed to become a detector voltage which is proportional to said power. The circuit comprises a transistor (Q2) acting as an active rectifier, which in the ascending part of the positive half cycle of the power (Pin) charges the capacitor (C3). In the descending part of the power the capacitor starts to discharge at a time constant which is remarkably greater than the cycle length of the power Pin). The transistor is biassed by means of a transistor (Q1) so that it is conductive even on the lowest power levels.
摘要翻译： 本发明涉及一种电路，通过该电路，处理从无线电话的RF功率传感器（SK）发射的功率（Pin）成为与所述功率成比例的检测器电压。 该电路包括用作有源整流器的晶体管（Q2），其在功率（Pin）的正半周期的上升部分对电容器（C3）充电。 在电源的下降部分，电容器开始放电，时间常数明显大于电源引脚的周期长度。 晶体管通过晶体管（Q1）偏置，使得即使在最低功率电平上它也是导电的。
-
6.发明授权
公开(公告)号：EP0397445B1
公开(公告)日：1995-12-13
申请号：EP90304937.7
申请日：1990-05-08
CPC分类号： H03G3/3042 , H03F2203/7239 , H04B2001/0416
-
-
8.发明授权
公开(公告)号：EP0397401B1
公开(公告)日：1994-11-02
申请号：EP90304840.3
申请日：1990-05-03
CPC分类号： H03G3/3042 , H04B2001/0416
-
9.发明公开A method for changing the operating class of a transmitter 失效Vorrichtung zurÄnderungder Betriebsklasse eines发件人。
公开(公告)号：EP0390360A2
公开(公告)日：1990-10-03
申请号：EP90302627.6
申请日：1990-03-13
CPC分类号： H03G3/20 , H03F1/0261 , H03F1/32 , H03G1/0088
摘要： The invention relates to a method for changing the operating class of a radio telephone transmitter used especially in a gsm radio telephone system. When the transmitter comprises one or several power stages of class A, B, AB or C, it is possible according to the invention to change the operating point of one or several power stage transistors (T) by means of a controlled semiconductor switch (S), whereby the class of the power stage amplifier changes to that desired.
摘要翻译： 本发明涉及一种改变特别在gsm无线电话系统中使用的无线电话发射机的操作类别的方法。 当发射机包括A，B，AB或C类的一个或多个功率级时，根据本发明可以通过受控半导体开关（S）改变一个或多个功率级晶体管（T）的工作点 ），由此功率级放大器的级别变为所需的级。
-
-
-
-
-
-
-
-
-
搜索结果
15 条记录 (耗时 0.01 秒)
