-
公开(公告)号：EP1317073B1
公开(公告)日：2005-01-12
申请号：EP02102634.9
申请日：2002-11-25
CPC分类号： H04N21/4383 , H03D7/163 , H03J1/0083 , H03J5/246 , H03L7/22 , H04B1/26 , H04N21/2383 , H04N21/4382
-
公开(公告)号：EP1383248A2
公开(公告)日：2004-01-21
申请号：EP03101604.1
申请日：2003-06-03
IPC分类号： H04B1/28
CPC分类号： H04B1/28
摘要： A single conversion tuner is provided for receiving digital terrestrial broadcast signals. The tuner comprises a single frequency changer comprising a mixer (4) and local oscillator (7) controlled by a PLL synthesiser (6). A non-alignable variable low pass filter (3) is provided between the tuner input and the mixer (4), which is of the image reject type. The bandwidth of the filter (3) is varied so as to track the local oscillator frequency to provide sufficient attenuation of the image channel without requiring any alignment during manufacture.
摘要翻译： 提供用于接收数字地面广播信号的单个转换调谐器。 调谐器包括单个变频器，其包括由PLL合成器（6）控制的混频器（4）和本地振荡器（7）。 在调谐器输入和混合器（4）之间提供不可校正的可变低通滤波器（3），该混频器具有图像拒绝型。 改变滤波器（3）的带宽，以便跟踪本地振荡器频率，以在制造期间不需要任何对准，来提供图像通道的足够的衰减。
-
公开(公告)号：EP1317073A1
公开(公告)日：2003-06-04
申请号：EP02102634.9
申请日：2002-11-25
CPC分类号： H04N21/4383 , H03D7/163 , H03J1/0083 , H03J5/246 , H03L7/22 , H04B1/26 , H04N21/2383 , H04N21/4382
摘要： A multiple tuner arrangement is formed on a single integrated circuit having a common radio frequency input terminal (10). The terminal (10) supplies a broadband input signal to a plurality of individual tuners (12, 13), which may be identical to each other in construction. The tuners (12, 13) operate simultaneously and independently of each other to convert a channel in the radio frequency input to the appropriate output intermediate frequency and supply this to the channel output terminal (26). Features such as a databus interface (28) and a common reference oscillator (29) for channel frequency synthesisers (19, 24) need not therefore be duplicated.
摘要翻译： 多个调谐器装置形成在具有公共射频输入端子（10）的单个集成电路上。 终端（10）将宽带输入信号提供给多个单独的调谐器（12,13），其可以在结构上彼此相同。 调谐器（12,13）同时且彼此独立地操作，以将射频输入中的通道转换成适当的输出中频，并将其提供给通道输出端（26）。 诸如用于信道频率合成器（19,24）的数据总线接口（28）和公共参考振荡器（29）的特征不需要重复。
-
公开(公告)号：EP1383248A3
公开(公告)日：2005-01-26
申请号：EP03101604.1
申请日：2003-06-03
IPC分类号： H04B1/28
CPC分类号： H04B1/28
摘要： A single conversion tuner is provided for receiving digital terrestrial broadcast signals. The tuner comprises a single frequency changer comprising a mixer (4) and local oscillator (7) controlled by a PLL synthesiser (6). A non-alignable variable low pass filter (3) is provided between the tuner input and the mixer (4), which is of the image reject type. The bandwidth of the filter (3) is varied so as to track the local oscillator frequency to provide sufficient attenuation of the image channel without requiring any alignment during manufacture.
-
5.发明公开
公开(公告)号：EP1292021A2
公开(公告)日：2003-03-12
申请号：EP02102214.0
申请日：2002-08-23
发明人： Madni, Arshad , Lauria, Franco , Cowley, Nicholas, Paul , Trodd, Lance, Rhys , Mudd, Mark, Stephen, John
IPC分类号： H03F3/45
CPC分类号： H03F3/45089 , H03F2203/45392 , H03F2203/45496 , H03F2203/45612
摘要： A radio frequency amplifier comprises a long tail pair of transistors 1, 2 provided with a tail current source 8, 9. The bases of the transistors 1 and 2 are driven by emitter followers comprising transistors 20 and 21 provided with collector load resistors 24 and 25. Feedback capacitors 26 and 27 ensure stability and feedback resistors 28, 29 bias the amplifier without degrading noise performance. The amplifier may be driven unbalanced while retaining good second harmonic distortion performance.
摘要翻译： 射频放大器包括设置有尾电流源8,9的长尾对晶体管1,2，晶体管1和2的基极由发射极跟随器驱动，晶体管20和21设置有集电极负载电阻24和25 反馈电容器26和27确保稳定性，并且反馈电阻器28,29偏置放大器而不降低噪声性能。 放大器可能被驱动不平衡，同时保持良好的二次谐波失真性能。
-
公开(公告)号：EP1292021B1
公开(公告)日：2007-07-04
申请号：EP02102214.0
申请日：2002-08-23
发明人： Madni, Arshad , Lauria, Franco , Cowley, Nicholas, Paul , Trodd, Lance, Rhys , Mudd, Mark, Stephen, John
CPC分类号： H03F3/45089 , H03F2203/45392 , H03F2203/45496 , H03F2203/45612
-
公开(公告)号：EP1292021A3
公开(公告)日：2004-06-16
申请号：EP02102214.0
申请日：2002-08-23
发明人： Madni, Arshad , Lauria, Franco , Cowley, Nicholas, Paul , Trodd, Lance, Rhys , Mudd, Mark, Stephen, John
CPC分类号： H03F3/45089 , H03F2203/45392 , H03F2203/45496 , H03F2203/45612
摘要： A radio frequency amplifier comprises a long tail pair of transistors 1, 2 provided with a tail current source 8, 9. The bases of the transistors 1 and 2 are driven by emitter followers comprising transistors 20 and 21 provided with collector load resistors 24 and 25. Feedback capacitors 26 and 27 ensure stability and feedback resistors 28, 29 bias the amplifier without degrading noise performance. The amplifier may be driven unbalanced while retaining good second harmonic distortion performance.
摘要翻译： 射频放大器包括设置有尾电流源8,9的长尾对晶体管2.晶体管1和2的基极由发射极跟随器驱动，晶体管20和21设置有集电极负载电阻24和25 反馈电容器26和27确保稳定性，并且反馈电阻器28,29偏置放大器而不降低噪声性能。 放大器可能被驱动不平衡，同时保持良好的二次谐波失真性能。
-
8.发明公开Radio frequency tuner front end with adaptive supply current 审中-公开Hochfrequenz-Tuner-Eingangsstufe mit adaptivem Versorgungsstrom
公开(公告)号：EP1359673A1
公开(公告)日：2003-11-05
申请号：EP03100878.2
申请日：2003-04-02
CPC分类号： H04B1/109
摘要： A circuit stage such as an input stage is provided for a radio frequency tuner having an input 1 which typically receives a broadband signal comprising many channels. The input stage comprises a low noise amplifier 2 in the form of a long tail pair of transistors 4 and 5 and a controllable tail current source 10, 11. A level detector 3 detects the signal level at the input of the amplifier 2 and controls the tail current source 10, 11 so as to increase the tail current as the signal amplitude rises above a threshold level and so as to keep the tail current fixed when the signal amplitude is below the threshold level.
摘要翻译： 提供诸如输入级的电路级用于具有通常接收包括许多通道的宽带信号的输入端1的射频调谐器。 输入级包括长尾对晶体管4,5和可控尾电流源10,11形式的低噪声放大器2.电平检测器3检测放大器2的输入处的信号电平并控制 尾电流源10,11，以便当信号幅度上升到阈值电平以上时增加尾电流，并且当信号幅度低于阈值电平时保持尾电流固定。
-
-
-
-
-
-
-
搜索结果
8 条记录 (耗时 0.01 秒)
