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1. 发明申请

US20130170581A1 QUADRATURE DIGITAL-IF TRANSMITTER WITHOUT INTER-STAGE SAW FILTER AND DEVICES USING SAME 有权
标题翻译：不具有间隔SAW滤波器的数字数字数字发射器和使用相同的器件
公开(公告)号：US20130170581A1
公开(公告)日：2013-07-04
申请号：US13341495
申请日：2011-12-30
申请人： Lup Meng Loh , Imtinan Elahi , Naveen Yanduru , Michael L. Brobston
发明人： Lup Meng Loh , Imtinan Elahi , Naveen Yanduru , Michael L. Brobston
IPC分类号： H04L25/49 , H04L25/03
CPC分类号： H04L25/03343 , H04L27/20 , H04L2027/0018
摘要： An RF transmitter comprises a digital-to-IF circuit block configured to receive a digital in-phase baseband signal and a digital quadrature baseband signal and to up-convert the digital in-phase and quadrature baseband signals to a digital in-phase IF signal and to a digital quadrature IF signal. The wireless RF transmitter further comprises an IF-to-RF circuit block configured to convert the digital in-phase and quadrature IF signals to analog signals and to up-convert the analog in-phase and quadrature IF signals to an RF output signal. The digital-to-IF circuit block comprises pre-compensation circuitry configured to reduce analog impairments associated with the IF-to-RF circuit block.
摘要翻译： RF发射机包括被配置为接收数字同相基带信号和数字正交基带信号的数/中频电路块，并且将数字同相和正交基带信号上变频到数字同相IF信号和数字正交IF信号。无线RF发射机还包括被配置为将数字同相和正交IF信号转换为模拟信号并将模拟同相和正交IF信号上变频为RF输出信号的IF至RF电路块。数字到中频电路块包括被配置为减少与IF到RF电路块相关联的模拟损伤的预补偿电路。

2. 发明申请

US20100330942A1 LINEARITY OF AN RF RECEIVE PATH BY SPURIOUS TONE SUPPRESSION 有权
标题翻译：射频接收路径通过SPULTIUS TONE抑制的线性
公开(公告)号：US20100330942A1
公开(公告)日：2010-12-30
申请号：US12492413
申请日：2009-06-26
申请人： Hunsoo Choo , Imtinan Elahi , Khurram Muhammad
发明人： Hunsoo Choo , Imtinan Elahi , Khurram Muhammad
IPC分类号： H04B17/00
CPC分类号： H04B17/309 , H04B17/21
摘要： A method of increasing linearity of an RF signal receive path includes measuring a signal amplified by the receive path. The receive path has a local oscillator operating at an LO frequency and a ground. An error signal is determined from the amplified signal, the error signal being representative of the nonlinearity. An anti-spur tone is injected into the ground. The anti-spur tone has a frequency about equal to the LO frequency and an amplitude and phase that are determined to increase the linearity of the receive path.
摘要翻译：提高RF信号接收路径的线性度的方法包括测量由接收路径放大的信号。接收路径具有以LO频率和接地运行的本地振荡器。误差信号由放大信号确定，误差信号代表非线性。抗刺激色调注入地面。反音色具有大约等于LO频率的频率以及被确定为增加接收路径的线性度的幅度和相位。

3. 发明申请

US20100165895A1 METHODS AND APPARATUS FOR CANCELING DISTORTION IN FULL-DUPLEX TRANSCEIVERS 有权
标题翻译：全双工收发器取消失效的方法和装置
公开(公告)号：US20100165895A1
公开(公告)日：2010-07-01
申请号：US12346591
申请日：2008-12-30
申请人： Imtinan Elahi , Khurram Muhammad
发明人： Imtinan Elahi , Khurram Muhammad
IPC分类号： H04B3/20
CPC分类号： H04L5/1461 , H04L5/1423 , H04L25/03031
摘要： Methods and apparatus for canceling distortion in full-duplex transceivers are disclosed. Some example methods to reduce distortion in a full-duplex transceiver include generating a first digital signal, generating a first analog signal based on the first digital signal for transmission over a full-duplex channel, receiving a second analog signal via the full-duplex channel, and generating a second digital signal based on the second analog signal, wherein the second digital signal includes coupling distortion based on the first analog signal. The example methods further include generating an adaptive filter signal based on the first digital signal, and reducing the coupling distortion from the second digital signal by subtracting the adaptive filter signal from the second digital signal.
摘要翻译：公开了用于消除全双工收发器失真的方法和装置。减少全双工收发器失真的一些示例性方法包括产生第一数字信号，基于第一数字信号产生第一模拟信号以便在全双工信道上传输，经由全双工信道接收第二模拟信号并且基于所述第二模拟信号产生第二数字信号，其中所述第二数字信号包括基于所述第一模拟信号的耦合失真。示例性方法还包括基于第一数字信号产生自适应滤波器信号，并且通过从第二数字信号中减去自适应滤波器信号来减少来自第二数字信号的耦合失真。

4. 发明申请

US20080129569A1 MIXED-SIGNAL FILTER 有权
标题翻译：混合信号滤波器
公开(公告)号：US20080129569A1
公开(公告)日：2008-06-05
申请号：US11863999
申请日：2007-09-28
申请人： Khurram Muhammad , Yongtao Wang , Imtinan Elahi
发明人： Khurram Muhammad , Yongtao Wang , Imtinan Elahi
IPC分类号： H03M1/12
CPC分类号： H03M3/344 , H03M3/40 , H03M3/454 , H03M3/456
摘要： One embodiment of the invention includes a mixed-signal filter. The mixed-signal filter comprises an analog signal path configured to process a first analog signal and an analog-to-digital converter (ADC) configured to convert the processed first analog signal to a digital signal. The mixed-signal filter also comprises a programmable digital feedback filter configured to filter the digital signal and a digital-to-analog converter (DAC) configured to convert the filtered digital signal to a second analog signal. The mixed-signal filter further comprises a signal combiner configured to combine an analog input signal of the mixed-signal filter and the second analog signal to generate the first analog signal.
摘要翻译：本发明的一个实施例包括混合信号滤波器。混合信号滤波器包括被配置为处理第一模拟信号的模拟信号路径和被配置为将经处理的第一模拟信号转换为数字信号的模拟 - 数字转换器（ADC）。混合信号滤波器还包括被配置为对数字信号进行滤波的可编程数字反馈滤波器和被配置为将经滤波的数字信号转换为第二模拟信号的数模转换器（DAC）。混合信号滤波器还包括信号组合器，其被配置为组合混合信号滤波器的模拟输入信号和第二模拟信号以产生第一模拟信号。

5. 发明授权

US08306480B2 System and method for transmission interference cancellation in full duplex transceiver 有权
标题翻译：全双工收发器中传输干扰消除的系统和方法
公开(公告)号：US08306480B2
公开(公告)日：2012-11-06
申请号：US12017372
申请日：2008-01-22
申请人： Khurram Muhammad , Imtinan Elahi
发明人： Khurram Muhammad , Imtinan Elahi
IPC分类号： H04B17/00
CPC分类号： H04B1/525
摘要： A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.
摘要翻译：全双工收发器具有包括辅助接收器和辅助发射器的消除电路。更具体地，包括传输信号泄漏的模拟接收信号被提供给低噪声放大器（LNA），低噪声放大器然后将其输出提供给主接收机和辅助接收机。辅助接收机包括可操作以将接收到的信号从模拟域转换为数字域的部分。辅助接收机还包括消除处理器，其确定传输信号泄漏并基于所确定的泄漏产生信号。由辅助接收器产生的该信号被提供给辅助发射机，其将数字信号转换回模拟域并产生消除信号。模拟消除信号被反馈并加到LNA的输入端的接收信号中。作为包括辅助接收机和辅助发射机的反馈系统的结果，可以从接收到的信号中消除许多类型的传输信号泄漏。

6. 发明授权

US07680456B2 Methods and apparatus to perform signal removal in a low intermediate frequency receiver 有权
标题翻译：在低中频接收机中执行信号去除的方法和装置
公开(公告)号：US07680456B2
公开(公告)日：2010-03-16
申请号：US11059147
申请日：2005-02-16
申请人： Khurram Muhammad , Imtinan Elahi
发明人： Khurram Muhammad , Imtinan Elahi
IPC分类号： H04B15/00 , H04B1/00
CPC分类号： H04B1/109
摘要： Methods, apparatus, and articles of manufacture are disclosed for removing an undesired component from a low intermediate frequency signal having an intermediate center frequency and an undesired component at a first frequency. One example method may include determining an amplitude of the undesired component; frequency shifting the low intermediate frequency signal from the intermediate center frequency to produce a zero intermediate frequency signal; filtering the zero intermediate frequency signal; generating a tone based on the amplitude of the undesired component; and subtracting the tone from the filtered zero intermediate frequency signal to remove the undesired component.
摘要翻译：公开了用于从具有第一频率的中间中心频率和不期望分量的低中频信号中去除不期望分量的方法，装置和制品。一个示例性方法可以包括确定不期望的分量的幅度; 从中间中心频率移位低频中频信号，产生零中频信号; 滤除零中频信号; 基于不期望的分量的振幅产生音调; 并从滤波的零中频信号中减去音调以去除不期望的分量。

7. 发明申请

US20090186582A1 SYSTEM AND METHOD FOR TRANSMISSION INTERFERENCE CANCELLATION IN FULL DUPLEX TRANSCEIVER 有权
标题翻译：全双工收发器中传输干扰消除的系统和方法
公开(公告)号：US20090186582A1
公开(公告)日：2009-07-23
申请号：US12017372
申请日：2008-01-22
申请人： Khurram Muhammad , Imtinan Elahi
发明人： Khurram Muhammad , Imtinan Elahi
IPC分类号： H04B1/00 , H04B15/00
CPC分类号： H04B1/525
摘要： A full duplex transceiver has cancellation circuitry that includes an auxiliary receiver and an auxiliary transmitter. More specifically, an analog received signal that includes transmission signal leakage is provided to a low noise amplifier (LNA), which then provides its output to a main receiver and the auxiliary receiver. The auxiliary receiver includes a portion operable to convert the received signal from the analog domain to the digital domain. The auxiliary receiver additionally includes a cancellation processor that determines the transmission signal leakage and generates a signal based on the determined leakage. This signal generated by the auxiliary receiver is provided to the auxiliary transmitter, which converts the digital signal back to the analog domain and generates a cancellation signal. The analog cancellation signal is fed back and added to the received signal at the input of the LNA. As a result of the feedback system including an auxiliary receiver and an auxiliary transmitter, transmission signal leakage of many types may be canceled from a received signal.
摘要翻译：全双工收发器具有包括辅助接收器和辅助发射器的消除电路。更具体地，包括传输信号泄漏的模拟接收信号被提供给低噪声放大器（LNA），低噪声放大器然后将其输出提供给主接收机和辅助接收机。辅助接收机包括可操作以将接收到的信号从模拟域转换为数字域的部分。辅助接收机还包括消除处理器，其确定传输信号泄漏并基于所确定的泄漏产生信号。由辅助接收器产生的该信号被提供给辅助发射机，其将数字信号转换回模拟域并产生消除信号。模拟消除信号被反馈并加到LNA的输入端的接收信号中。作为包括辅助接收机和辅助发射机的反馈系统的结果，可以从接收到的信号中消除许多类型的传输信号泄漏。

8. 发明申请

US20090185510A1 RF PROCESSOR HAVING INTERNAL CALIBRATION MODE 有权
标题翻译：具有内部校准模式的RF处理器
公开(公告)号：US20090185510A1
公开(公告)日：2009-07-23
申请号：US12017514
申请日：2008-01-22
申请人： Imtinan Elahi , Khurram Muhammad
发明人： Imtinan Elahi , Khurram Muhammad
IPC分类号： H04B7/005 , H04B1/44
CPC分类号： H04B17/21 , H04B17/10
摘要： The present invention pertains to a method of calibrating reception properties of a radio frequency (RF) processor. The application describes two embodiments of the invention representing calibration of the properties using an auxiliary transmitter to generate a calibration signal internal to the RF processor.
摘要翻译：本发明涉及校准射频（RF）处理器的接收特性的方法。本申请描述了本发明的两个实施例，其表示使用辅助发射机来校准属性，以产生RF处理器内部的校准信号。

9. 发明授权

US08213555B2 Methods and apparatus to improve distortion performance and direct current (DC) offset cancellation in receivers 有权
标题翻译：改善接收机失真性能和直流（DC）偏移消除的方法和装置
公开(公告)号：US08213555B2
公开(公告)日：2012-07-03
申请号：US12397994
申请日：2009-03-04
申请人： Imtinan Elahi , Khurram Muhammad
发明人： Imtinan Elahi , Khurram Muhammad
IPC分类号： H03D1/04
CPC分类号： H03D3/008 , H04B1/30
摘要： Methods, apparatus, and articles of manufacture are described for improving distortion performance and for direct current offset cancellation in receivers. In one example, a method of improving distortion in a receiver includes determining a direct current (DC) amplitude of an offset signal, generating the offset signal, and providing the offset signal to an output of a mixer to improve the distortion performance of the mixer.
摘要翻译：描述了用于改善接收机中的失真性能和直流偏移消除的方法，装置和制品。在一个示例中，改善接收机中的失真的方法包括确定偏移信号的直流（DC）幅度，产生偏移信号，以及将偏移信号提供给混频器的输出，以改善混频器的失真性能。

10. 发明申请

US20090225911A1 METHODS AND APPARATUS TO IMPROVE DISTORTION PERFORMANCE AND DIRECT CURRENT (DC) OFFSET CANCELLATION IN RECEIVERS 有权
标题翻译：改善接收机的失真性能和直流电流（DC）偏移消除的方法和装置
公开(公告)号：US20090225911A1
公开(公告)日：2009-09-10
申请号：US12397994
申请日：2009-03-04
申请人： Imtinan Elahi , Khurram Muhammad
发明人： Imtinan Elahi , Khurram Muhammad
IPC分类号： H03D1/04 , H03L5/00
CPC分类号： H03D3/008 , H04B1/30
摘要： Methods, apparatus, and articles of manufacture are described for improving distortion performance and for direct current offset cancellation in receivers. In one example, a method of improving distortion in a receiver includes determining a direct current (DC) amplitude of an offset signal, generating the offset signal, and providing the offset signal to an output of a mixer to improve the distortion performance of the mixer.
摘要翻译：描述了用于改善接收机中的失真性能和直流偏移消除的方法，装置和制品。在一个示例中，改善接收机中的失真的方法包括确定偏移信号的直流（DC）幅度，产生偏移信号，以及将偏移信号提供给混频器的输出，以改善混频器的失真性能。

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