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公开(公告)号：US20130176914A1
公开(公告)日：2013-07-11
申请号：US13718148
申请日：2012-12-18
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
IPC: H04B1/44
CPC classification number: H04B1/44 , H04B1/525 , H04L5/1461
Abstract: Radio frequency (RF) duplexing devices and methods of operating the same are disclosed. In one embodiment, an RF duplexing device includes a transmission port, a receive port, a first duplexer, and a second duplexer. The first duplexer is coupled to the transmission port and the receive port, and is configured to provide a first phase shift from the transmission port to the receive port. The second duplexer is also coupled to the transmission port and the receive port. However, the second duplexer is configured to provide a second phase shift that is differential to the first phase shift from the transmission port to the receive port. By providing the second phase shift so that the second phase shift is differential to the first phase shift, the RF duplexing device can provide isolation through cancellation without needing to introduce significant insertion losses.
Abstract translation: 公开了射频（RF）双工设备及其操作方法。 在一个实施例中，RF双工设备包括传输端口，接收端口，第一双工器和第二双工器。 第一双工器耦合到传输端口和接收端口，并且被配置为提供从传输端口到接收端口的第一相移。 第二双工器也耦合到传输端口和接收端口。 然而，第二双工器被配置为提供与从传输端口到接收端口的第一相移差分的第二相移。 通过提供第二相移使得第二相移与第一相移不同，RF双工设备可以通过取消提供隔离，而不需要引入显着的插入损耗。
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公开(公告)号：US20130141062A1
公开(公告)日：2013-06-06
申请号：US13690187
申请日：2012-11-30
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
IPC: G05F1/59
CPC classification number: G05F1/59 , H02M1/10 , H02M1/14 , H02M2001/0067 , H03F1/0227 , H03F1/26 , H03F3/24 , H03F2200/351 , H03F2200/451 , H03F2200/504 , H04B15/005
Abstract: This disclosure relates to radio frequency (RF) power converters and methods of operating the same. In one embodiment, an RF power converter includes an RF switching converter, a low-drop out (LDO) regulation circuit, and an RF filter. The RF filter is coupled to receive a pulsed output voltage from the RF switching converter and a supply voltage from the LDO regulation circuit. The RF filter is operable to alternate between a first RF filter topology and a second RF filter topology. In the first RF filter topology, the RF filter is configured to convert the pulsed output voltage from a switching circuit into the supply voltage. The RF filter in the second RF filter topology is configured to filter the supply voltage from the LDO regulation circuit to reduce a ripple variation in a supply voltage level of the supply voltage. As such, the RF filter provides greater versatility.
Abstract translation: 本公开涉及射频（RF）功率转换器及其操作方法。 在一个实施例中，RF功率转换器包括RF开关转换器，低压降（LDO）调节电路和RF滤波器。 RF滤波器被耦合以接收来自RF开关转换器的脉冲输出电压和来自LDO调节电路的电源电压。 RF滤波器可操作以在第一RF滤波器拓扑和第二RF滤波器拓扑之间交替。 在第一RF滤波器拓扑中，RF滤波器被配置为将来自开关电路的脉冲输出电压转换成电源电压。 第二RF滤波器拓扑中的RF滤波器被配置为对来自LDO调节电路的电源电压进行滤波，以减少电源电压的电源电压电平中的纹波变化。 因此，RF滤波器提供更大的通用性。
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公开(公告)号：US10312960B2
公开(公告)日：2019-06-04
申请号：US14926116
申请日：2015-10-29
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
Abstract: A switchable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed. The group of RF TX bandpass filters includes a first RF TX bandpass filter and a second RF TX bandpass filter, such that each of the first RF TX bandpass filter and the second RF TX bandpass filter is coupled to a first filter connection node. The group of RF TX switching elements includes a first RF TX switching element coupled between the first filter connection node and a first common connection node, which is coupled to a first RF antenna. Each of the group of RF RX bandpass filters is coupled to the first common connection node.
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公开(公告)号：US10250290B2
公开(公告)日：2019-04-02
申请号：US13953808
申请日：2013-07-30
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
Abstract: This disclosure relates generally to radio frequency (RF) front-end circuitry for different types of carrier aggregation, along with methods of operating the same. In one embodiment, the RF front-end circuitry includes a first diplexer, a second diplexer, first antenna selection circuitry, and second antenna selection circuitry. In order to maintain adequate isolation between high bands and low bands but provide carrier aggregation, the first antenna selection circuitry is configured to selectively couple each of a first plurality of RF ports to any one of a first low band port in the first diplexer and a second low band port in the second diplexer, while the second antenna selection circuitry is configured to selectively couple each of the second plurality of RF ports to any one of a first high band port in the first diplexer and a second high band port in the second diplexer.
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公开(公告)号：US10224759B2
公开(公告)日：2019-03-05
申请号：US14792891
申请日：2015-07-07
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
Abstract: Aspects disclosed in the detailed description include a wireless charging circuit comprising a radio frequency (RF) power harvesting circuit. In one aspect, the RF power harvesting circuit is configured to harvest a wireless RF charging signal provided by a wireless charging station to generate a direct-current (DC) charging signal to charge a battery, for example, a lithium-ion (Li-ion) battery, in a battery-operated electronic device. In another aspect, a wireless charging controller controls the RF power harvesting circuit to dynamically increase or decrease an effective charging power of the DC charging signal according to a target charging power determined according to a charging profile of the battery. By dynamically adjusting the effective charging power provided to the battery according to the charging profile of the battery, it is possible to provide fast charging to the battery while protecting the battery from overcharging damage.
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Patent Agency Ranking
公开(公告)号：US10090762B2
公开(公告)日：2018-10-02
申请号：US14831080
申请日：2015-08-20
Applicant: RF Micro Devices, Inc.
Inventor： Mohammad Ahsanul Adeeb , Philippe Gorisse , Nadim Khlat , Michael R. Kay
Abstract: A direct current (DC) voltage converter configured to transition between operation modes is disclosed. A voltage selection circuitry is provided in a DC voltage conversion circuit to control a buck-boost converter that generates a DC output voltage. As opposed to conventional methods of switching the buck-boost converter between a buck mode and a boost mode based on a single switching threshold, the voltage selection circuitry is configured to switch the buck-boost converter between the buck mode and the boost mode based on multiple voltage thresholds. Each of the multiple voltage thresholds defines a respective range for the DC output voltage. By controlling the buck-boost converter based on multiple voltage thresholds, it is possible to provide a smoother transition between the buck mode and the boost mode, thus reducing voltage errors in the DC output voltage and improving reliability of the DC voltage conversion circuit.
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公开(公告)号：US09899986B2
公开(公告)日：2018-02-20
申请号：US14547502
申请日：2014-11-19
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat , Marcus Granger-Jones
CPC classification number: H03H7/463 , H03H7/48 , H04B1/0057 , H04B1/40 , H04B1/50 , H04B10/556 , H04L5/08 , H04L27/2085
Abstract: Embodiments of a tunable radio frequency (RF) diplexer and methods of operating the same are disclosed. In one embodiment, the RF diplexer includes a first hybrid coupler, a second hybrid coupler, an RF filter circuit, and a phase inversion component. Both the RF filter circuit and the phase inversion component are connected between the first hybrid coupler and the second hybrid coupler. The phase inversion component is configured to provide approximately a differential phase. The RF filter circuit is configured to provide a passband and a notch. The RF filter circuit is tunable to provide the notch on both a high-frequency side of the passband and a low frequency side of the passband. Accordingly, the tunable RF diplexer provides lower insertion losses and higher isolation regardless of whether the one of the diplexed frequency bands is set at higher frequencies or lower frequencies than the other diplexed frequency band.
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98.发明授权公开(公告)号：US09837984B2
公开(公告)日：2017-12-05
申请号：US15004084
申请日：2016-01-22
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat , Andrew F. Folkmann , Robert Aigner , Marcus Granger-Jones
CPC classification number: H03H9/542 , H03H9/605 , H03H9/6483 , H03H9/6489
Abstract: 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.
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公开(公告)号：US09780866B2
公开(公告)日：2017-10-03
申请号：US14824937
申请日：2015-08-12
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
CPC classification number: H04B7/24 , H03H7/40 , H03H7/465 , H03H11/30 , H03H11/344
Abstract: A configurable RF transmit/receive (TX/RX) multiplexer, which includes a group of RF TX bandpass filters, a group of RF TX switching elements, and a group of RF RX bandpass filters; is disclosed. Each of the group of RF RX bandpass filters is coupled to a first common connection node. Each of the group of RF TX switching elements is coupled between a corresponding one of the group of RF TX bandpass filters and the first common connection node, which is coupled to a first RF antenna.
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公开(公告)号：US09614476B2
公开(公告)日：2017-04-04
申请号：US14789464
申请日：2015-07-01
Applicant: RF Micro Devices, Inc.
Inventor： Nadim Khlat
CPC classification number: H03F1/0222 , H03F1/0233 , H03F3/245 , H03F2200/102 , H03F2200/129 , H03F2200/451 , H03F2200/504
Abstract: An RF communications system, which includes an RF power amplifier, an envelope tracking power supply, and supply control circuitry, is disclosed. The RF communications system operates in one of a normal operation mode and a calibration mode. During the calibration mode, the RF power amplifier receives and amplifies an RF input signal to provide an RF transmit signal using an envelope power supply signal, which is provided by the envelope tracking power supply. Further, the supply control circuitry controls the envelope tracking power supply to cause a sharp transition of the envelope power supply signal when a setpoint of the envelope power supply signal transitions through a setpoint threshold of the envelope power supply signal.
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