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公开(公告)号：US09973173B2
公开(公告)日：2018-05-15
申请号：US15010829
申请日：2016-01-29
发明人： Nadim Khlat , Marcus Granger-Jones
CPC分类号： H03H19/002 , H03H7/465 , H03H2250/00 , H04B1/006
摘要： This disclosure relates to radio frequency (RF) front end circuitry used to route RF signals. In one embodiment, the RF front end circuitry has a filter circuit and a switch device. The switch device includes a common port, an RF port, and switchable path connected in series between the common port and the RF port. The switch device is configured to present approximately the filter capacitance of the filter circuit at the common port when the switchable path is closed. However, when the switchable path is open, the switch device is configured to present a device capacitance at the common port that is approximately equal to the filter capacitance of the filter circuit. In this manner, if the common port is connected to an antenna, the capacitance seen by the antenna from the common port remains substantially unchanged regardless of which of the switchable path is opened or closed.
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公开(公告)号：US09935662B2
公开(公告)日：2018-04-03
申请号：US15131417
申请日：2016-04-18
发明人： Nadim Khlat , Andrew F. Folkmann
CPC分类号： H04B1/006 , H03F3/24 , H04B1/0458 , H04B1/0475 , H04B2001/0408 , H04L5/14
摘要： A front-end module configured to cancel unwanted transmit spectrum at one or more receivers comprises at least one transmitter having a power amplifier and configured to transmit signals to an antenna. The front-end module also comprises at least one receiver to receive the transmit signals, wherein the at least one receiver receives at least a portion of unwanted transmit spectrum. A directional coupler couples at least a portion of a transmit output signal from the power amplifier to provide a coupled transmit output signal to signal conditioning circuitry associated with the at least one receiver and configured to condition the coupled transmit output signal to generate a conditioned transmit signal to provide to the at least one receiver, wherein the conditioned transmit signal at least partially cancels the unwanted transmit spectrum. The signal conditioning circuitry may adjust the amplitude and phase of the coupled transmit output signal.
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公开(公告)号：US09853685B2
公开(公告)日：2017-12-26
申请号：US14329493
申请日：2014-07-11
发明人： Nadim Khlat , Jayanti Jaganatha Rao
CPC分类号： H04B1/525 , H03H7/0153 , H03H7/463 , H04L5/14 , H04L5/1415 , H04L5/1469 , H04L5/16
摘要： RF duplexing and methods of operating the same are described herein. In one embodiment, an RF duplexing system may include a control circuit and a duplexer with a first tunable RF filter and second tunable RF filter. The control circuit is operable in a full duplexing transmission mode and a half duplexing transmission mode. The control circuit tunes the first tunable RF filter in the full duplexing transmission mode so that the first tunable RF filter defines a transmission passband and tune the second tunable RF filter so that the second tunable RF filter defines a receive passband. Also, the control circuit tunes one of the tunable RF filters so that the tunable RF filter defines the passband while the other tunable RF filter enhances the passband. In this manner, the tunable RF filters in the duplexer are both utilized to get better performance during the half duplexing mode.
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公开(公告)号：US09843342B2
公开(公告)日：2017-12-12
申请号：US14922803
申请日：2015-10-26
发明人： Nadim Khlat
IPC分类号： H04B1/00
CPC分类号： H04B1/0057 , H04B1/0064
摘要： A tunable RF transmit/receive (TX/RX) multiplexer, which includes a tunable RF TX/RX diplexing circuit and a first group of RF RX bandpass filters, is disclosed. The tunable RF TX/RX diplexing circuit has a first RX connection node and a first antenna port, which is coupled to a first RF antenna. Each of the first group of RF RX bandpass filters is coupled to the first RX connection node. At least two of the first group of RF RX bandpass filters simultaneously receive and filter respective RF input signals via the first RX connection node to provide respective filtered RF input signals.
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公开(公告)号：US09711999B2
公开(公告)日：2017-07-18
申请号：US14851642
申请日：2015-09-11
摘要： Antenna array calibration for wireless charging is disclosed. A wireless charging system is provided and configured to calibrate antenna elements in a wireless charging station based on a feedback signal provided by a wireless charging device. The antenna elements in the wireless charging station transmit wireless radio frequency (RF) charging signals to the wireless charging device. The wireless charging device provides the feedback signal to the wireless charging station to indicate total RF power in the wireless RF charging signals. The wireless charging station is configured to adjust transmitter phases associated with the antenna elements based on the feedback signal until the total RF power in the wireless RF charging signals is maximized. By calibrating the antenna elements based on the feedback signal, it is possible to achieve phase coherency among the antenna elements without requiring factory calibration.
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公开(公告)号：US09698751B2
公开(公告)日：2017-07-04
申请号：US14931165
申请日：2015-11-03
CPC分类号： H03H7/463 , H01F17/0006
摘要： RF multiplexer circuitry includes a first signal path coupled between a first intermediate node and a common node, a second signal path coupled between a second intermediate node and the common node, first resonator circuitry coupled between the first signal path and ground, and second resonator circuitry coupled between the second signal path and ground. The first resonator circuitry is configured to allow signals within a first frequency pass band to pass between the first intermediate node and the common node, while attenuating signals outside of the first frequency pass band. The first resonator circuitry includes a first LC resonator. The second resonator circuitry is configured to allow signals within a second frequency pass band to pass between the second intermediate node and the common node, while attenuating signals outside of the second frequency pass band.
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公开(公告)号：US09584071B2
公开(公告)日：2017-02-28
申请号：US14868890
申请日：2015-09-29
发明人： Nadim Khlat
CPC分类号： H03F1/0227 , H03F3/19 , H03F3/245 , H03F2200/102 , H03F2200/451 , H03G3/3036 , H04B1/04 , H04B2001/0416
摘要： Envelope power supply circuitry includes power converter circuitry and envelope tracking circuitry. The power converter circuitry is configured to receive an envelope power converter control signal and a supply voltage and provide an envelope power supply signal for an amplifier from the supply voltage and based on the envelope power converter control signal. The envelope tracking circuitry is coupled to the power converter circuitry. In a first mode of operation, the envelope tracking circuitry is configured to provide the envelope power converter control signal such that a gain of the amplifier remains substantially constant over a range of input power provided to the amplifier. In a second mode of operation, the envelope tracking circuitry is configured to limit the dynamic range of the envelope power supply signal.
摘要翻译： 信封电源电路包括电源转换器电路和信封跟踪电路。 功率转换器电路被配置为接收包络功率转换器控制信号和电源电压，并且根据电源电压并基于包络功率转换器控制信号为放大器提供包络电源信号。 信封跟踪电路耦合到功率转换器电路。 在第一操作模式中，包络跟踪电路被配置为提供包络功率转换器控制信号，使得在提供给放大器的输入功率的范围上，放大器的增益保持基本恒定。 在第二操作模式中，包络跟踪电路被配置为限制包络电源信号的动态范围。
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公开(公告)号：US20160365836A1
公开(公告)日：2016-12-15
申请号：US15055119
申请日：2016-02-26
发明人： Nadim Khlat , Michael R. Kay
IPC分类号： H03F1/02 , H03F3/19 , H03F3/24 , H03K5/1536
CPC分类号： H03K5/1536 , H03F1/0222 , H03F1/0266 , H03F3/19 , H03F3/245 , H03F2200/102 , H03F2200/391 , H03F2200/432 , H03F2200/451 , H03F2200/462
摘要： Circuitry, which includes a parallel amplifier and a switching supply, is disclosed. The parallel amplifier regulates a power supply output voltage based on a power supply control signal and provides a current sense signal, which is representative of a parallel amplifier output current from the parallel amplifier. The switching supply is coupled to the parallel amplifier. The switching supply provides a switching output voltage and makes an early determination of the switching output voltage using the current sense signal and the power supply control signal to at least partially compensate for delay in the switching supply. Additionally, the switching supply drives the parallel amplifier output current toward zero using the switching output voltage to increase efficiency.
摘要翻译： 公开了包括并联放大器和开关电源的电路。 并联放大器基于电源控制信号调节电源输出电压，并提供电流检测信号，其代表来自并行放大器的并行放大器输出电流。 开关电源耦合到并联放大器。 开关电源提供开关输出电压，并且使用电流检测信号和电源控制信号来早期确定开关输出电压，以至少部分地补偿开关电源中的延迟。 此外，开关电源使用开关输出电压将并行放大器输出电流驱动到零，以提高效率。
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9.发明申请RF LADDER FILTER WITH SIMPLIFIED ACOUSTIC RF RESONATOR PARALLEL CAPACITANCE COMPENSATION 有权射频梯形滤波器，具有简化的声学RF谐振器并联电容补偿公开(公告)号：US20160191012A1
公开(公告)日：2016-06-30
申请号：US15004084
申请日：2016-01-22
CPC分类号： H03H9/542 , H03H9/605 , H03H9/6483 , H03H9/6489
摘要： An RF ladder filter having a parallel capacitance compensation circuit is disclosed. The parallel capacitance compensation circuit is made up of a first inductive element with a first T-terminal and a first end coupled to a first ladder terminal and a second inductive element with a second T-terminal that is coupled to the first T-terminal of the first inductive element and a second end coupled to a second ladder terminal. Further included is a compensating acoustic RF resonator (ARFR) having a fixed node terminal and a third T-terminal that is coupled to the first T-terminal of the first inductive element and the second T-terminal of the second inductive element, and a finite number of series-coupled ladder ARFRs, wherein the parallel capacitance compensation circuit is coupled across one of the finite number of series-coupled ARFRs by way of the first ladder terminal and the second ladder terminal.
摘要翻译： 公开了一种具有并联电容补偿电路的RF梯形滤波器。 并联电容补偿电路由具有第一T端和第一端耦合到第一梯形终端的第一电感元件和与第二电感元件耦合的第二电感元件组成，第二电感元件连接到第一T端的第一T端 第一电感元件和耦合到第二梯形终端的第二端。 还包括具有固定节点终端的补偿声RF谐振器（ARFR）和耦合到第一电感元件的第一T端和第二电感元件的第二T端的第三T端，以及 有限数量的串联耦合梯形ARFR，其中并联电容补偿电路通过第一梯形终端和第二梯形终端耦合在有限数量的串联耦合ARFR之一上。
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公开(公告)号：US09379670B2
公开(公告)日：2016-06-28
申请号：US14163256
申请日：2014-01-24
发明人： Nadim Khlat , Michael R. Kay , Manbir Singh Nag
摘要： A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element. The offset capacitive element has an offset capacitive voltage. The offset capacitance voltage control loop regulates the offset capacitive voltage, which is adjustable on a communications slot-to-communications slot basis.
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