公开(公告)号：US20220123735A1

公开(公告)日：2022-04-21

申请号：US17235131

申请日：2021-04-20

申请人： QUALCOMM Incorporated

发明人： Changhan Hobie Yun ,  Hannu Laurila ,  Ville Lehtisalo ,  Ville Herman Brunou ,  Daniel Daeik Kim ,  Paragkumar Ajaybhai Thadesar ,  Nosun Park ,  Wei Cheng

IPC分类号： H03J3/20 ,  H03H7/01 ,  H04B1/18 ,  H03H3/00

摘要： An exemplary tunable circuit includes an inductor coupled to a node and a first capacitor coupled to the node. The tunable circuit also includes a variable capacitor coupled to the node, such that a total capacitance of the tunable circuit depends on a fixed capacitance of the first capacitor and a variable capacitance of the variable capacitor. In an example, the inductor and the first capacitor are both included in a passive device and the variable capacitor is in a semiconductor device. The variable capacitor allows the total capacitance to be modified for the purpose of, for example, calibrating the capacitance to account for manufacturing variations, and/or adjusting to a frequency range of operation used by wireless devices in a region of the world. The first capacitor may be a higher quality capacitor providing a larger portion of the total capacitance than the variable capacitor.

公开(公告)号：US20220113374A1

公开(公告)日：2022-04-14

申请号：US17558502

申请日：2021-12-21

申请人： MEDIATEK INC.

发明人： Tzu-Chin Lin ,  Chih-Ming Hung ,  Jui-Lin Hsu ,  Chao-Ching Hung ,  Bao-Chi Peng

IPC分类号： G01S7/40 ,  H03J7/04 ,  H03J7/06 ,  H03L7/183 ,  H04B17/21 ,  G01S13/02 ,  G01S13/88

摘要： A system includes a local oscillator (LO) signal generation circuit, a receiver (RX) circuit, and a calibration circuit. The LO signal generation circuit generates an LO signal according to a reference clock, and includes an active oscillator that generates the reference clock. The active oscillator includes at least one active component. The RX circuit generates a processed RX signal by processing an RX input signal according to the LO signal. The calibration circuit checks a signal characteristic of the processed RX signal by detecting if a calibration tone exists within a receiver bandwidth, set a frequency calibration control output in response to the calibration tone being not found in the receiver bandwidth, and output the frequency calibration control output to the LO signal generation circuit. The LO signal generation circuit adjusts an LO frequency of the LO signal in response to the frequency calibration control output.

公开(公告)号：US11245381B2

公开(公告)日：2022-02-08

申请号：US16210637

申请日：2018-12-05

申请人： Infineon Technologies AG

发明人： Stefan Helmut Schmalzl ,  Peter Pfann ,  Ruediger Bauder ,  Hans-Joerg Timme

IPC分类号： H03H9/54 ,  H03H7/01 ,  H03H9/64 ,  H03H9/52 ,  H03H9/05 ,  H03H9/60 ,  H03H9/58 ,  H04B1/00 ,  H03H3/02 ,  H03H11/12 ,  H04B1/10 ,  H04B1/40 ,  H03H9/02 ,  H03H9/17 ,  H03H9/48 ,  H03H9/00 ,  H03H9/66 ,  H04B1/04 ,  H04B1/50 ,  H03H7/12 ,  H03H7/46 ,  H04B1/525 ,  H03F3/19 ,  H03F3/21 ,  H03H9/70 ,  H04B1/18 ,  H03J3/20 ,  H03H9/205 ,  H01L41/187 ,  H03J1/00

摘要： In accordance with an embodiment, an RF system includes a transmit path having a first tunable transmit band stop filter, and a power amplifier coupled to an output of the first tunable transmit band stop filter, where the first tunable transmit band stop filter is configured reject a receive frequency and pass a transmit frequency; a receive path comprising an LNA; and a duplex filter having a transmit path port coupled to an output of the power amplifier, a receive path port coupled to an input of the LNA, and an antenna port, where the duplex filter is configured to pass the transmit frequency and reject the receive frequency between the antenna port and the transmit path port, pass the receive frequency and reject the transmit frequency between the antenna port and the receive path port.

公开(公告)号：US11237249B2

公开(公告)日：2022-02-01

申请号：US16168853

申请日：2018-10-24

申请人： MEDIATEK INC.

发明人： Tzu-Chin Lin ,  Chih-Ming Hung ,  Jui-Lin Hsu ,  Chao-Ching Hung ,  Bao-Chi Peng

IPC分类号： G01S7/40 ,  H03J7/04 ,  H03J7/06 ,  H03L7/183 ,  H04B17/21 ,  G01S13/02 ,  G01S13/88

摘要： A wireless system includes a local oscillator (LO) signal generation circuit, a receiver (RX) circuit, and a calibration circuit. The LO signal generation circuit generates an LO signal according to a reference clock. The LO signal generation circuit includes an active oscillator. The active oscillator generates the reference clock, wherein the active oscillator includes at least one active component, and does not include an electromechanical resonator. The RX circuit generates a down-converted RX signal by performing down-conversion upon an RX input signal according to the LO signal. The calibration circuit generates a frequency calibration control output according to a signal characteristic of the down-converted RX signal, and outputs the frequency calibration control output to the LO signal generation circuit. The LO signal generation circuit adjusts an LO frequency of the LO signal in response to the frequency calibration control output.

公开(公告)号：US20220007070A1

公开(公告)日：2022-01-06

申请号：US17479141

申请日：2021-09-20

申请人： SAMSUNG ELECTRONICS CO., LTD.

发明人： Ki-moon KWON

IPC分类号： H04N21/431 ,  G08C17/02 ,  H03J1/00 ,  H04N21/422 ,  H04N21/482

摘要： A remote controller includes a touch screen, a communicator, and a processor. The processor controls control a first user interface to be displayed on the touch screen, identifies a signal which is received through the communicator while the first user interface is displayed on the touch screen, and controls a second user interface to be displayed on the touch screen based on the received signal. The second user interface performs a function which is different from that of the first user interface.

公开(公告)号：US20210405239A1

公开(公告)日：2021-12-30

申请号：US16915491

申请日：2020-06-29

申请人： Baker Hughes Oilfield Operations LLC

发明人： Yi LIU ,  Stanislav Wilhelm FORGANG ,  John JONES ,  Carlos RIVERO ,  Louis PEREZ ,  Fei LE ,  Babak KOUCHMESHKY ,  Yinxi ZHANG

IPC分类号： G01V3/30 ,  E21B47/12 ,  H03J3/22 ,  H01Q9/04

摘要： A multi-frequency tuning circuit includes a first branch including a first inductor and a first capacitor arranged in series and a second branch including a second inductor and a second capacitor arranged in series. The circuit is arranged within a circuitry module configured to be positioned between a source and a load, the first branch and the second branch both associated with loads, from the source, having low impedance frequencies. In order to improve transmitter antenna output power for downhole tools, the tuning circuit creates high impedance at operating frequencies between frequencies corresponding to low impedance.

公开(公告)号：US11158794B2

公开(公告)日：2021-10-26

申请号：US16773842

申请日：2020-01-27

申请人： Newport Fab, LLC

发明人： Chris Masse ,  David J. Howard ,  Nabil EI-Hinnawy ,  Gregory P. Slovin

IPC分类号： H01L45/00 ,  H03H11/04 ,  H03J5/02 ,  H03H11/12

摘要： A high-yield, tunable radio frequency (RF) filter includes a plurality of process-dependent capacitors and a plurality of non-volatile RF switches. Each of the plurality of process-dependent capacitors is connected to at least one of the plurality of non-volatile RF switches. An auxiliary capacitor in the plurality of process-dependent capacitors is engaged by an ON-state non-volatile RF switch in the plurality of non-volatile RF switches. A primary capacitor in the plurality of process-dependent capacitors is disengaged by an OFF-state non-volatile RF switch in the plurality of non-volatile RF switches. The auxiliary capacitor substitutes for the primary capacitor.

公开(公告)号：US20210328578A1

公开(公告)日：2021-10-21

申请号：US17240226

申请日：2021-04-26

申请人： Silicon Laboratories Inc.

发明人： Ruifeng Sun ,  Abdulkerim Coban

IPC分类号： H03J5/24 ,  H03H11/04

摘要： In one embodiment, a tuning network includes: a controllable capacitance; a first switch coupled between the controllable capacitance and a reference voltage node; a second switch coupled between the controllable capacitance and a third switch; the third switch coupled between the second switch and a second voltage node; a fourth switch coupled between the second voltage node and a first inductor; the first inductor having a first terminal coupled to the fourth switch and a second terminal coupled to at least the second switch; and a second inductor having a first terminal coupled to the second terminal of the first inductor and a second terminal coupled to the controllable capacitance.

公开(公告)号：US11095337B2

公开(公告)日：2021-08-17

申请号：US16894821

申请日：2020-06-07

申请人： RFMicron, Inc.

发明人： Shahriar Rokhsaz

IPC分类号： H04B7/00 ,  H04B1/713 ,  H04B17/318 ,  H03J3/20 ,  H04B5/00 ,  H04W4/80

摘要： A communication system includes a passive wireless sensor and a sensor computing device. The passive wireless sensor is operable to receive a radio frequency (RF) signal including a carrier frequency signal and a modulated sense request signal, generate a power supply voltage, determine received signal strength (RSSI) of the RF signal, and determine whether the RSSI is at a desired level. When the RSSI is at a desired level, the passive wireless sensor generates a response RF signal including the carrier frequency and a coded sense response signal representative of a sensed environmental condition. The sensed environmental condition affects impedance of a front-end of the passive wireless sensor to produce an affected impedance. The passive wireless sensor generates the coded sense response signal based on tuning the affected impedance to resonate with the carrier frequency signal. The computing device operable to: transmit the RF signal, receive the response RF signal, and generate an environmental condition value based on the coded sense response signal and environmental conversion information.

公开(公告)号：US11064373B2

公开(公告)日：2021-07-13

申请号：US16846951

申请日：2020-04-13

申请人： RFMicron, Inc.

发明人： Shahriar Rokhsaz

IPC分类号： H04B5/00 ,  H04W24/02 ,  H04W52/02 ,  H04B1/40 ,  H03J3/20 ,  G06K19/07 ,  G06K7/10 ,  H04W84/18 ,  H04W76/14

摘要： A radio frequency identification (RFID) tag includes an antenna structure operable to receive a radio frequency (RF) signal, an RF signal circuit operable to, when enabled, produce the RF signal, a sensing element operably coupled to the antenna structure, a memory, and a processing module. When in a calibration mode, the processing module adjusts the input impedance until a measured power level is substantially equal to the desired input power level, and generates a first digital value based on the amount of the adjustment a power difference between a measured first input power level and a desired power level, and stores the first digital value in the memory, where the first digital value is representative of a known condition. In a sense mode, the processing module adjusts the input impedance until a second measured power level is substantially equal to the desired input power level, and generates a second digital value based on the amount of the adjustment a power difference between a measured first input power level and a desired power level, and the desired power level, and stores the second digital value in the memory, where the second digital value is representative of an unknown condition.