-
公开(公告)号：US08665000B2
公开(公告)日：2014-03-04
申请号：US13576827
申请日：2011-02-14
IPC分类号： G06G7/12
CPC分类号： H03D7/165 , H03D7/18 , H03D2200/0086
摘要： A method of frequency down-converting an input signal to an output signal, a first local oscillator signal is generated as a square wave having a duty cycle of 1/3 or 2/3, and the input signal is mixed with first oscillator signal to achieve a first down-converted signal, a second local oscillator signal is generated as a modified square wave having the same period time as the first oscillator signal and a duty cycle of 2/3, of which one part has a positive amplitude and another part has a negative amplitude. The input signal is mixed with the second oscillator signal to achieve a second down-converted signal. The first oscillator signal has a delay of 1/4 of the period time to achieve a phase shift of π/2 between the oscillator signals, and at least one down-converted signal is multiplied by a pre-calculated factor. The resulting down-converted signals are added to achieve the output signal.
摘要翻译： 将输入信号下变频为输出信号的方法，产生第一本地振荡器信号作为占空比为1/3或2/3的方波，并将输入信号与第一振荡器信号混合 实现第一下变频信号，产生第二本地振荡器信号作为具有与第一振荡器信号相同周期时间的修正方波，并且产生其中一部分具有正振幅的占空比2/3，另一部分 具有负幅度。 输入信号与第二振荡器信号混合以实现第二下变频信号。 第一振荡器信号具有周期时间的1/4的延迟以实现振荡器信号之间的π/ 2的相移，并且至少一个下变频信号乘以预先计算的因子。 所产生的下变频信号被加入以实现输出信号。
-
公开(公告)号：US08204467B2
公开(公告)日：2012-06-19
申请号：US12368785
申请日：2009-02-10
申请人： Fredrik Tillman , Fenghao Mu
发明人： Fredrik Tillman , Fenghao Mu
IPC分类号： H04B1/26
CPC分类号： H04B1/30 , H03D7/18 , H03D2200/0086
摘要： The second-order inter-modulation distortion, originating in a differential passive mixer core from imbalance between devices, is reduced by compensating for the mismatch or load, by means of tuning the differential output impedance at the mixer core, or the input impedance of a filter coupled to the output of the passive mixer. Compensating for the imbalance allows greater suppression of even-order harmonics in the differential structure, which reduces second-order intermodulation at the output of the mixers. The compensation is achieved by tunable resistive elements that are calibrated by a built-in self-test architecture. The calibration circuit is deactivated during receiver operation.
摘要翻译： 通过调整混频器核心的差分输出阻抗或调制器的输入阻抗，通过补偿失配或负载来减少源自器件之间不平衡的差分无源混频器核心的二阶互调失真 滤波器耦合到无源混频器的输出。 补偿不平衡允许更大的抑制差分结构中的偶次谐波，这减少了混频器输出端的二阶互调。 补偿通过可调电阻元件实现，该电阻元件由内置的自检架构校准。 在接收机操作期间，校准电路被禁用。
-
公开(公告)号：US09426681B2
公开(公告)日：2016-08-23
申请号：US14125723
申请日：2012-06-13
申请人： Bengt Lindoff , Fredrik Tillman
发明人： Bengt Lindoff , Fredrik Tillman
IPC分类号： H04B1/10 , H04W24/08 , H04W52/02 , H04B17/00 , H04B17/345
CPC分类号： H04W24/08 , H04B1/1036 , H04B1/109 , H04B17/29 , H04B17/345 , H04W52/0229 , H04W52/0238 , Y02D70/1222 , Y02D70/1262 , Y02D70/40
摘要： A method of estimation of harmonic distortion level for a radio receiver operative in a cellular communication system enabled to receive signals from transmitters of one or more cells is disclosed. The method comprises measuring, within a bandwidth of operation, a total received signal power; measuring, within the bandwidth of operation, a received signal power of signals received from the one or more cells, respectively; and estimating a level of harmonic receiver distortions by: determining whether a fraction of the total received signal power and a theoretical noise floor is below or above a first threshold; or determining whether a remaining part of the total received signal power, said remaining part not including said fraction, is above or below a second threshold. A such radio receiver, and a computer program for implementing the method are also disclosed.
摘要翻译： 公开了一种用于在能够从一个或多个单元的发射机接收信号的蜂窝通信系统中操作的无线电接收机的谐波失真电平的估计方法。 该方法包括在操作的带宽内测量总接收信号功率; 在所述操作带宽内分别测量从所述一个或多个小区接收的信号的接收信号功率; 以及通过以下步骤来估计谐波接收机失真的水平：确定总接收信号功率的一小部分和理论噪声基底是否低于或高于第一阈值; 或者确定总接收信号功率的剩余部分是否不包括所述分数的所述剩余部分高于或低于第二阈值。 还公开了一种这样的无线电接收机和用于实现该方法的计算机程序。
-
公开(公告)号：US20150038097A1
公开(公告)日：2015-02-05
申请号：US14125723
申请日：2012-06-13
申请人： Bengt Lindoff , Fredrik Tillman
发明人： Bengt Lindoff , Fredrik Tillman
CPC分类号： H04W24/08 , H04B1/1036 , H04B1/109 , H04B17/29 , H04B17/345 , H04W52/0229 , H04W52/0238 , Y02D70/1222 , Y02D70/1262 , Y02D70/40
摘要： A method of estimation of harmonic distortion level for a radio receiver operative in a cellular communication system enabled to receive signals from transmitters of one or more cells is disclosed. The method comprises measuring, within a bandwidth of operation, a total received signal power; measuring, within the bandwidth of operation, a received signal power of signals received from the one or more cells, respectively; and estimating a level of harmonic receiver distortions by: determining whether a fraction of the total received signal power and a theoretical noise floor is below or above a first threshold; or determining whether a remaining part of the total received signal power, said remaining part not including said fraction, is above or below a second threshold. A such radio receiver, and a computer program for implementing the method are also disclosed.
摘要翻译： 公开了一种用于在能够从一个或多个单元的发射机接收信号的蜂窝通信系统中操作的无线电接收机的谐波失真电平的估计方法。 该方法包括在操作的带宽内测量总接收信号功率; 在所述操作带宽内分别测量从所述一个或多个小区接收的信号的接收信号功率; 以及通过以下步骤来估计谐波接收机失真的水平：确定总接收信号功率的一小部分和理论噪声基底是否低于或高于第一阈值; 或者确定总接收信号功率的剩余部分是否不包括所述分数的所述剩余部分高于或低于第二阈值。 还公开了一种这样的无线电接收机和用于实现该方法的计算机程序。
-
公开(公告)号：US08755758B2
公开(公告)日：2014-06-17
申请号：US13121228
申请日：2009-09-28
申请人： Stefan Andersson , Kirill Kozmin , Fredrik Tillman
发明人： Stefan Andersson , Kirill Kozmin , Fredrik Tillman
IPC分类号： H04B1/04
CPC分类号： H04B1/0475 , H04B1/525
摘要： A technique of suppressing noise in a transmitter device (300) is provided, wherein the transmitter device (300) comprises a baseband signal processing stage (301) operating at baseband frequency and comprising a modulator (316, 320) for converting a baseband signal into an RF signal, and an RF signal processing stage (301) operating at RF and comprising an amplifier (330). A method implementation of this technique comprises the steps performed in a feedback loop (333, 336) coupled around the amplifier (330) of tapping the RF signal processing stage downstream of the amplifier (330) to obtain an amplified RF signal comprising a baseband signal component and a noise component, downconverting the tapped RF signal to baseband frequency, removing the baseband signal component from the downconverted signal, upconverting the resulting signals still comprising the noise component to RF frequency and feeding the upconverted signal back to the RF signal processing stage upstream of the amplifier (330) thereby suppressing the noise component.
摘要翻译： 提供了一种抑制发射机设备（300）中的噪声的技术，其中发射机设备（300）包括在基带频率下操作的基带信号处理级（301），并且包括用于将基带信号转换成 RF信号和RF信号处理级（301），其在RF处工作并且包括放大器（330）。 这种技术的方法实现包括在放大器330连接的反馈回路（333,336）中执行的步骤，该放大器330在放大器330的下游点击RF信号处理级，以获得包括基带信号的放大RF信号 将抽头的RF信号下变频到基带频率，从下变频信号中去除基带信号分量，将仍然包含噪声分量的结果信号上变频到RF频率，并将上变频信号反馈到RF信号处理级上游 的放大器（330），从而抑制噪声分量。
-
公开(公告)号：US08213893B2
公开(公告)日：2012-07-03
申请号：US13242258
申请日：2011-09-23
申请人： Henrik Sjöland , Fredrik Tillman
发明人： Henrik Sjöland , Fredrik Tillman
CPC分类号： H03D7/14
摘要： A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provided as transistors. First and second LO signals and their inverse signals having separated phases are provided for driving the transistors. Signal path switches are provided between the RF terminals and the mixer transistors. The switches are driven by signals having a different phase than the signal driving the corresponding mixer transistor. Thus, any short circuit between IF terminals of the arrangement may be eliminated.
摘要翻译： 一种正交连接的无源混频器装置，用于将模拟信号从第一频率转换到第二频率。 该装置包括作为晶体管提供的两个并联连接的混频器。 第一和第二LO信号及其具有分离相位的反相信号被提供用于驱动晶体管。 信号路径开关设置在RF端子和混频器晶体管之间。 开关由具有与驱动相应的混频器晶体管的信号不同的相位的信号驱动。 因此，可以消除该装置的IF端子之间的任何短路。
-
公开(公告)号：US20120076056A1
公开(公告)日：2012-03-29
申请号：US13264262
申请日：2010-04-08
CPC分类号： H04W72/085 , H04W88/08 , Y02D70/1222 , Y02D70/1242 , Y02D70/1262
摘要： The present invention relates to scheduling of uplink and downlink resources between mobile terminals (110, 120) and a base station (130). To reduce the power leakage between the transmitter and the receiver of the mobile terminal (110), the scheduler allocates uplink frequency carriers and downlink frequency carriers with a large duplex distance to those mobile terminals (110, 120) that have to transmit with high power. This means that the requirements on the external SAW filter could be reduced.
摘要翻译： 本发明涉及移动终端（110,120）和基站（130）之间的上行链路和下行链路资源的调度。 为了减少移动终端（110）的发射机和接收机之间的功率泄漏，调度器向那些必须以高功率传输的移动终端（110,120）分配具有大双工距离的上行链路频率载波和下行链路频率载波 。 这意味着可以减少对外部SAW滤波器的要求。
-
公开(公告)号：US08099070B2
公开(公告)日：2012-01-17
申请号：US12108239
申请日：2008-04-23
申请人： Fenghao Mu , Fredrik Tillman
发明人： Fenghao Mu , Fredrik Tillman
IPC分类号： H04B1/16
CPC分类号： H03D7/166 , H03D7/1441 , H03D7/1458 , H03D7/1466 , H03D7/163 , H03D7/165 , H03D2200/0043 , H03D2200/0084 , H03D2200/0088 , H03D2200/009
摘要： According to one embodiment, a radio frequency receiver includes a quadrature mixer for converting radio frequency signals to baseband signals or intermediate frequency signals. The quadrature mixer includes an in-phase passive mixer and a quadrature-phase passive mixer. Each passive mixer includes a mixer core having a plurality of mixer input switch transistors and a plurality of output switch transistors connected to the mixer input switch transistors. Clock circuitry generates a first set of clock signals and a second set of clock signals. The first set of clock signals has a frequency twice that of the second set of clock signals. The first set of clock signals is arranged to drive the mixer input switch transistors and the second set of clock signals is arranged to drive the output switch transistors.
摘要翻译： 根据一个实施例，射频接收机包括用于将射频信号转换成基带信号或中频信号的正交混频器。 正交混频器包括同相无源混频器和正交相位无源混频器。 每个无源混频器包括具有多个混频器输入开关晶体管的混频器核心和连接到混频器输入开关晶体管的多个输出开关晶体管。 时钟电路产生第一组时钟信号和第二组时钟信号。 第一组时钟信号的频率是第二组时钟信号的两倍。 第一组时钟信号被布置成驱动混频器输入开关晶体管，并且第二组时钟信号被布置成驱动输出开关晶体管。
-
公开(公告)号：US08060048B2
公开(公告)日：2011-11-15
申请号：US10596691
申请日：2004-11-17
申请人： Henrik Sjöland , Fredrik Tillman
发明人： Henrik Sjöland , Fredrik Tillman
CPC分类号： H03D7/1441 , H03D7/1458 , H03D7/1466 , H03D7/165 , H03D2200/0047 , H03D2200/0084
摘要： A quadrature connected passive mixer arrangement for frequency converting analog signals from a first to a second frequency. The arrangement comprises two parallel connected mixers provided as transistors. First and second LO signals and their inverse signals having separated phases are provided for driving the transistors. Signal path switches are provided between the RF terminals and the mixer transistors. The switches are driven by signals having a different phase than the signal driving the corresponding mixer transistor. Thus, any short circuit between IF terminals of the arrangement may be eliminated.
摘要翻译： 一种正交连接的无源混频器装置，用于将模拟信号从第一频率转换到第二频率。 该装置包括作为晶体管提供的两个并联连接的混频器。 第一和第二LO信号及其具有分离相位的反相信号被提供用于驱动晶体管。 信号路径开关设置在RF端子和混频器晶体管之间。 开关由具有与驱动相应的混频器晶体管的信号不同的相位的信号驱动。 因此，可以消除该装置的IF端子之间的任何短路。
-
10.发明授权公开(公告)号：US07945230B2
公开(公告)日：2011-05-17
申请号：US12118517
申请日：2008-05-09
申请人： Fredrik Tillman
发明人： Fredrik Tillman
IPC分类号： H04B1/26
摘要： A passive, differential RF mixer reduces second order intermodulation interference while maintaining I/Q isolation via common mode feedback wherein the I and Q error signals in the feedback path are time multiplexing using a four-phase LO signal. An RF signal is received at a differential input having a center tap. The RF signal is mixed with an in-phase differential signal of the four-phase local oscillator signal in a differential mixer (I mixer). The RF signal is also mixed with a quadrature-phase differential signal Q components of the four-phase local oscillator signal in a differential mixer (Q mixer). The common mode levels of the I and Q differential mixer outputs are compared to a reference DC voltage to generate I and Q error signals. The I and Q error signals are time-multiplexed, and fed back to the RF input center tap.
摘要翻译： 无源的差分RF混频器通过共模反馈来保持I / Q隔离，从而降低二阶互调干扰，其中反馈路径中的I和Q误差信号是使用四相LO信号的时间复用。 在具有中心抽头的差分输入处接收RF信号。 在差分混频器（I混频器）中将RF信号与四相本地振荡器信号的同相差分信号混合。 在差分混频器（Q混频器）中，RF信号也与四相本地振荡器信号的正交相位差分信号Q分量混合。 将I和Q差分混频器输出的共模电平与参考DC电压进行比较，以产生I和Q误差信号。 I和Q误差信号被时分复用，并反馈到RF输入中心抽头。
-
-
-
-
-
-
-
-
-
搜索结果
26 条记录 (耗时 0.02 秒)
