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41. 发明公开

EP1645117A1 APPARATUS AND METHOD FOR PROVIDING AN AGC FUNCTION USING MULTIPLE FEEDBACK SOURCES 有权
标题翻译：设备和方法提供AGC功能使用多重反馈源
公开(公告)号：EP1645117A1
公开(公告)日：2006-04-12
申请号：EP04777684.4
申请日：2004-07-08
申请人： Thomson Licensing
发明人： HUTCHINSON, Daniel, Mark , ECOFF, Clint, Alan , GRUBBS, Gary, Dean , MAYER, Matthew, Thomas
IPC分类号： H04N5/52
CPC分类号： H03G3/3052 , H03G3/3068 , H04N5/4401 , H04N5/46 , H04N5/52
摘要： An apparatus (20) such as a television signal receiver provides an AGC function by using multiple feedback sources which provide both narrow band and wide band AGC signals in an adaptive manner. According to an exemplary embodiment, the apparatus (20) includes a tuner (10, 15, 20, 25, 30) operative to generate first and second IF signals. A first demodulator (40) is operative to generate a first AGC signal responsive to the first IF signal. A second demodulator (50) is operative to generate a second AGC signal responsive to the second IF signal. A wide band AGC detector (60) is operative to generate a third AGC signal responsive to at least one of the first and second IF signals. A switch (70) is operative to selectively provide one of the first, second and third AGC signals to the tuner (10, 15, 20, 25, 30) responsive to a predetermined condition.

42. 发明公开

EP1645114A1 INTEGRATED CIRCUIT FOR A MOBILE TELEVISION RECEIVER 有权
标题翻译：集成电路用于移动电视接收器
公开(公告)号：EP1645114A1
公开(公告)日：2006-04-12
申请号：EP03817448.8
申请日：2003-07-11
申请人： Infineon Technologies AG
发明人： Muschallik, Claus , LOW, Hwang, Chee , NEO, Tee, Yong , Muschallik, Claus
IPC分类号： H04N5/44
CPC分类号： H04B7/0837 , H03G3/3068 , H03J5/244 , H03J2200/01 , H03J2200/40 , H04B7/084 , H04B7/10 , H04N5/44 , H04N5/4401 , H04N5/455 , H04N5/46 , H04N21/41407 , H04N21/4382 , H04N21/4436 , Y02D70/1222 , Y02D70/124 , Y02D70/442 , Y02D70/444
摘要： An integrated circuit for a mobile television receiver has a processing path for I/Q demodulation, a processing path for low IF demodulation, and a switch that determines which of the processing paths is used to generate an output. The integrated circuit may be employed irrespective of which of the two processing standards is required for received mobile TV signals. The integrated circuit may be designed to reduce power consumption in the mobile device, for example by disabling sections of the integrated circuit when they are not in use.

43. 发明授权

EP1303053B1 Method and apparatus for continuously controlling the dynamic range from an analog to digital converter 有权
标题翻译：用于连续控制的模拟 - 数字转换器的动态范围的方法和装置
公开(公告)号：EP1303053B1
公开(公告)日：2006-02-08
申请号：EP02256547.7
申请日：2002-09-20
申请人： Nokia Corporation
发明人： Pärssinen, Aarno , Vepsäläinen, Jussi , Seppinen, Pauli
IPC分类号： H04B1/16
CPC分类号： H04B1/10 , H03G3/3068 , H04B1/109 , H04B1/16

44. 发明公开

EP1618674A2 AN AMPS RECEIVER SYSTEM USING A ZERO-IF ARCHITECTURE 有权
标题翻译：以零中频架构AMPS接收器系统
公开(公告)号：EP1618674A2
公开(公告)日：2006-01-25
申请号：EP03810032.7
申请日：2003-01-24
申请人： QUALCOMM INCORPORATED
发明人： CICCARELLI, Steven, C. , RAGHUPATHY, Arun
IPC分类号： H04B1/30
CPC分类号： H04B1/406 , H03G3/3068 , H04B1/0003 , H04B1/30
摘要： An AMPS receiver system utilizing a ZIF architecture and processing received forward link signals in the digital domain. The AMPS receiver system includes an antenna (105), a direct converter (110), high dynamic A/D converters (120, 130), low pass filters (140, 150), a phase shifter (160), a digital FM demodulator (180), an accumulator (185) and a controller (190). The direct converter (110) further includes a low noise amplifier (112), a splitter (113), mixers (114, 116) and low pass filters (118, 119). The controller (190) adjusts the gains of the low noise amplifier (112) and the digital VGA (170) based on the average power of the signal outputted by the digital VGA (170).

45. 发明公开

EP1618655A2 FRONT-END SENSITIVITY BOOSTER 有权
标题翻译：放大电路为了提高输入级的灵敏度
公开(公告)号：EP1618655A2
公开(公告)日：2006-01-25
申请号：EP04722355.7
申请日：2004-03-22
申请人： Koninklijke Philips Electronics N.V.
发明人： LAMBRECHT, Xavier Jean Francois
IPC分类号： H03G3/30
CPC分类号： H03G3/3068
摘要： The invention relates to a method for increasing the sensitivity of a chain of amplifiers that comprises the steps of amplifying a signal by means of a first amplifier with a gain factor A1=A1,m* Δ A1, where A1,m denotes a constant gain factor and A1 denotes a gain factor variation with 1 ≤ Δ A1,min ≤ Δ A1 ≤ ΔA1,max, further amplifying the signal by means of a second amplifier with a controllable gain factor A2 ≤ A2,max, where variations Δ A1 of the gain of the first amplifier are compensated by reducing the gainA2 of the second amplifier, so that the difference between the chain gain factor AC = A1*A2 and a target chain gain factor AT ≤ AT,max becomes zero. To solve the object of the invention to provide a method for increasing the sensitivity of a chain of amplifiers that suffers from gain factor variations, it is proposed that that the signal at the output of the second amplifier is additionally fed into a divider that applies a fixed factor A3 ≤ 1 to its input, that variations Δ A1 of the gain factor A1 of the first amplifier as well as the fixed factor A3 are at least partially compensated by the gain factor A2 of the second amplifier, so that the difference between the chain gain factor AC’= A1*A2*A3 and the target chain gain factor AT becomes minimum, and that the fixed factor A3 is chosen so that there exist at least some combinations of values Δ A1 and AT for which said difference can be forced to zero, and some combinations of values Δ A1 and AT, for which said difference can no longer be forced to zero due to the limitation A2 ≤ A2,max. The invention further relates to a device for increasing the sensitivity of a chain of amplifiers.

46. 发明公开

EP1605587A1 A receiver comprised in a radio communication system 审中-公开
标题翻译：的接收器包括一个Funkkommunicationssystem
公开(公告)号：EP1605587A1
公开(公告)日：2005-12-14
申请号：EP04013390.2
申请日：2004-06-07
申请人： Infineon Technologies AG
发明人： Rudberg, Mikael
IPC分类号： H03G3/30 , H04B1/10
CPC分类号： H04B1/109 , H03G3/3052 , H03G3/3068 , H04W24/00 , H04W88/02
摘要： The present invention relates to a receiver (100) comprised in a radio communication system, which receiver (100) is operable to optimise the use of the available dynamic range. The receiver (100) comprises an automatic gain control means (102) comprised in an automatic gain control loop. The receiver (100) also comprises a first measurement means (104) connected to said automatic gain control means (102) operable to measure the total received energy. The receiver (100) also comprises a second measurement means (106) connected to said automatic gain control means (102) operable to measure the inband signal energy. The automatic gain control means (102) is operable to adjust the gain in dependence of both the total received energy and the inband signal energy.

47. 发明公开

EP1583232A2 Automatic gain control device and method 有权
标题翻译：装置和方法，用于自动增益控制
公开(公告)号：EP1583232A2
公开(公告)日：2005-10-05
申请号：EP05090077.8
申请日：2005-03-29
申请人： NEC CORPORATION
发明人： Ishihara, Takeshi, c/o NEC Corporation
IPC分类号： H03G3/30
CPC分类号： H04W52/22 , H03G3/3068 , H03G2201/103 , H03G2201/202 , H03G2201/305 , H03G2201/307 , H03G2201/702 , H03M1/122 , H03M1/18 , H03M1/183
摘要： An automatic gain control device includes an amplifier for a reception signal, a signal processing unit, a memory, and a control unit. The amplifier can set a gain. The signal processing unit extracts control data from an output from the amplifier and performs information processing for the data. The memory stores the gain setting value of the amplifier. The control unit controls the gain of the amplifier in accordance with a preset control algorithm. On the basis of the result obtained when the control unit computes a gain setting value stored in the memory in accordance with a preset algorithm, the control unit controls the gain of the amplifier in correspondence with operation of switching the frequency of a reception signal, which is accompanied by different frequency monitoring in the compressed mode by the signal processing unit. A radio communication terminal, a control method for an automatic gain control device, a control program for an automatic gain control device, an automatic gain control method, a radio communication system, and a radio communication method are also disclosed.

48. 发明公开

EP1513268A2 Method and apparatus for increasing receiver immunity to interference 失效
标题翻译： Verfahren zumErhöhenderStörungsimmunitäteinesEmpfängers
公开(公告)号：EP1513268A2
公开(公告)日：2005-03-09
申请号：EP04019498.7
申请日：1995-12-11
申请人： QUALCOMM INCORPORATED
发明人： Wheatley, Charles E. III c/o Qualcomm Incorporated , Peterzell, Paul E. , Kornfeld, Richard K. , Weiland, Ana L.
IPC分类号： H04B7/005
CPC分类号： H04W52/52 , H03F3/72 , H03F2203/7239 , H03G1/0088 , H03G3/3052 , H03G3/3068 , H04B1/109 , H04B1/70755 , H04B1/7097
摘要： The method and apparatus of the present invention improve the immunity to interference of a radio receiver. The power level of a received signal is detected. If the power level meets or exceeds a predetermined power threshold, the low noise amplifier is by-passed, thus increasing the intercept point of the receiver components. Alternative embodiments include the use of an RF power detector to control the front-end gain as a function of jammer power. In lieu of a switchable RF gain block, several methods of continuous gain control are proposed. Continuous gain control allows the interference suppression and sensitivity of the receiver to be adjusted at lower signal levels than the switchable gain block.
摘要翻译：一种用于增加无线电接收机对射频干扰的抗扰度的装置，所述无线电接收机接收信号，所述装置包括：耦合到接收信号的开关（1105），所述开关（1105）具有打开位置和闭合位置; 电阻（1101），电阻（1101）的第一端耦合到开关（1105）的闭合位置，电阻（1101）的第二端耦合到地电位; 具有耦合到开关（1105）的打开位置的输入的放大器（1101），用于在输出端产生放大的接收信号; 耦合到开关（1105）的控制器，用于响应于超过预定功率电平的接收信号将开关（1105）切换到闭合位置，所述接收信号通过所述开关（1105）和所述电阻（1101）传导至当所述开关（1105）处于所述关闭位置时的接地电位; 并且当所述开关（1105）处于闭合位置时，所述电阻（1101）在所述放大器（1110）的输入处产生阻抗失配，由此降低由所述放大器（1110）贡献的增益。

49. 发明公开

EP1471653A1 DIRECT CONVERSION RECEIVER AND DC OFFSET REDUCING METHOD 审中-公开
标题翻译：直接执行接收器和直流偏置衰减过程
公开(公告)号：EP1471653A1
公开(公告)日：2004-10-27
申请号：EP03734861.2
申请日：2003-01-28
申请人： MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
发明人： MATSUMOTO, Hidenori , OBARA, Toshio
IPC分类号： H04B1/30 , H04B1/707 , H04L27/14 , H04L27/22
CPC分类号： H04L25/06 , H03G3/3068 , H04B1/30 , H04B2201/70707 , H04L27/3809
摘要： A determining section (18) and gain variation amount detecting section (9) detect a period having a poss ibility of a DC-component offset in an internal circuit of a direct conversion receiver increasing beyond an allowable value due to AGC operation, and during the period, a cut-off frequency of each of high-pass filters (12a to 12d) is set at a frequency higher than that in general operation, thereby rapidly converging transient responses of signals passed through the high-pass filters, while controlling precisely operation timings of reception power measuring section (16), gain calculating section (22), gain control section (23) and circuit power supply control section (24) composing an AGC loop, whereby the DC offset is prevented from increasing and stable circuit operation is assured. It is thereby possible to achieve further reductions in size and power consumption of a CDMA receiver using the direct conversion receiver.

50. 发明公开

EP1137174A3 Automatic gain control system 审中-公开
标题翻译：系统自动增益控制
公开(公告)号：EP1137174A3
公开(公告)日：2004-05-12
申请号：EP01107267.5
申请日：2001-03-23
申请人： NEC CORPORATION
发明人： Uesugi, Hiroyuki, c/o NEC Saitama, Ltd.
IPC分类号： H03G3/30
CPC分类号： H03G3/3042 , H03G3/3068
摘要： Discrete data of a base-band signal obtained by a control unit is multiplied by data equivalent to a time constant of a wave detector unit, thus enabling the deterioration in a detection voltage generated during detection of a modulation wave having a marked variation in amplitudes such as CDMA. It is possible to obtain a stable power outputted by an RF unit. Accordingly, the stable automatic gain control can be performed in consideration of the variation in the detection voltages due to the type of signals inputted to the wave detector unit, irrespective of the type of inputted signals.

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