2146 results about "Radio frequency front end" patented technology

A receiver for continuous carrier phase tracking of low carrier-to-noise ratio (“CNR”) signals from a plurality of radio navigation satellites while the receiver is mobile. The receiver may have: a radio frequency (RF) front-end that provides satellite data corresponding to signals received from the plurality of radio navigation satellites; an inertial measurement unit (IMU) that provides inertial data; and a processor circuit in circuit communication with the RF front end and the IMU, the processor circuit being capable of using satellite data from the RF front-end and inertial data from the IMU to perform continuous carrier phase tracking of low CNR radio navigation satellite signals having a CNR of about 20 dB-Hz, while the receiver is mobile. The receiver may be a GPS receiver for continuous carrier phase tracking of low-CNR GPS signals.

The invention discloses a configurable multi-mode multi-band satellite navigation receiving method and a radio frequency front end module constructed by the method. The front end module can receive signals of satellite navigation and positioning systems such as a global positioning system (GPS), the Big Dipper, a Galileo positioning system and a global navigation satellite system (Glonass), and comprises a configurable low-noise amplifier (LNA) with a buffer and an active balun, a folding passive mixer with a configurable frequency synthesizer, a configurable multi-mode filter, an automatic gain control (AGC) amplifier, a direct-current bias circuit, and a multi-mode multi-band program controlled and coded on-off control word from a receiving system. The radio frequency front end module can meet the requirement of multi-band multi-mode work through the control word programmed by the receiving system, has a simple and reliable structure, does not need complicated time division multiplexing control system and off-chip module, has low cost and high flexibility, and improves the noise performance of the radio frequency front end of the whole receiver and multi-mode multi-band signal processing capacity; and a one-channel signal is input into the module, and the module outputs a two-channel differential signal. The receiver can be used for receiving and processing multi-mode satellite navigation signals asynchronously, and receiving and processing satellite navigation signals with the required mode in different time intervals according to the requirement.

An electronic circuit comprising a transistor-based RF (radio frequency) power amplifier (112) having balanced outputs (172, 176), a transistor-based receiver RF amplifier (116) having balanced inputs (152, 156) ohmically connected to said balanced outputs (172, 176) respectively of said RF power amplifier (112), and a balun (114) having a primary (182, 186) and a secondary (188), said primary (182, 186) having primary connections and a supply connection (185) of said primary (182, 186) intermediate said primary connections and said primary connections ohmically connected both to said balanced outputs (172, 176) of said RF power amplifier (112) respectively and to said balanced inputs (152, 156) of said receiver RF amplifier, thereby to switchlessly couple RF between the balun (114) and the RF power amplifier (112) and switchlessly couple RF between the balun (114) and the receiver RF amplifier (116). Other electronic circuits, processes, devices and systems are disclosed.

A radio frequency front end for a television band receiver and spectrum sensor includes a low noise amplifier that amplifies a received signal output of a radio frequency antenna connected to the radio frequency front end, a pin diode attenuator circuit that selectively attenuates an output of the low noise amplifier, and a buffer amplifier that amplifies an output of the pin diode attenuator.

The invention discloses a GPS / SINS (global positioning system / strapdown inertial navigation system) combined navigating system with high anti-interference performance and a realizing method thereof, which belong to the technical field of navigation. The system comprises a GPS array antenna, a radio-frequency front end, an interference inhibiting module, a GPS baseband processing link, an SINS module and a combined navigating unit. The method comprises the following steps: 1, receiving a GPS signal and treating the GPS signal by the radio-frequency front end; 2, detecting high-power electromagnetic interference; 3, regulating an antenna beam in a self-adaptive way and filtering to remove a high-power interference signal; 4, carrying out the navigation resolution and the information fusion of a GPS and an SINS; and 5, obtaining an auxiliary parameter. The system and the realizing method have favorable dynamic tracking capability and anti-interference performance; the high-power interference signal can be effectively prevented from causing the saturation and the jamming of a GSP radio-frequency front end; and the robustness performance of the navigating system for dealing with a complicated interference environment is improved.

A front end circuit for selectively coupling a first antenna and a second antenna to a transmit chain and a receive chain of a radio frequency (RF) transceiver is disclosed. There is a first power amplifier having an input connectible to the transmit chain of the RF transceiver, a first low noise amplifier having an output connectible to the receive chain of the RF transceiver, and a second low noise amplifier with an input connectible to the second antenna, as well as an output connectible to the receive chain of the RF transceiver. A first matching and switch network is connected to the first antenna, the output of the first power amplifier, and the input of the first low noise amplifier. Transmit signals from the first power amplifier and receive signals from the first antenna are selectively passed to the first antenna and the first low noise amplifier.

A modular base station enhancing system includes multiple bi-directional amplifiers that are remotely controlled. Duplexers, corresponding to the bi-directional amplifiers, interface the bi-directional amplifiers with base station antenna elements, enabling simultaneous transmission and reception through the antenna elements. A control circuit, located remotely from the base station and the bi-directional amplifiers, enables control of at least one parameter in each of the bi-directional amplifiers to control transmission and reception characteristics of the antennas elements. The controllable bi-directional amplifiers may include a linear power amplifier to amplify transmitted signals and a low-noise amplifier to amplify received signals. The base station enhancing system is interoperable with different types of antenna elements, and may be implemented as a radio frequency (RF) front-end of the base station or as an RF repeater.

A transmitting apparatus in a TDD wireless communication system is provided. In the transmitting apparatus, a circulator transmits a signal received from a power amplifier to an antenna feed line and transmits a signal received from the antenna feed line to a quarter-wave transmission line. The quarter-wave transmission line is installed in a reception path, for reception isolation in a transmission mode. An RF switch shorts the load of the quarter-wave transmission line to the ground or connects the load of the quarter-wave transmission line to an LNA according to a control signal. The LNA low-noise-amplifies a signal received from the RF switch.

Examples of the present invention include a radar apparatus comprising a substrate, an antenna disposed on a first side of the substrate, a Butler matrix supported by same the substrate, output ports of the Butler matrix being electrically connected with a group of radiative elements; and input ports configured to be in communication with a radio frequency (RF) circuit. The RF circuit may be supported proximate or adjacent the substrate.

A front end circuit for coupling a plurality of antennas to a multi-channel time domain duplex RF transceiver is disclosed. The front end circuit has a first transmit port, a first receive chain primary port, a first receive chain secondary ports, and a first antenna port connectable to a first one of the plurality of antennas. The front end circuit also has a second transmit port, a second receive chain primary port, and a second receive chain secondary port connectable to a second one of the plurality of antennas. A first switch has terminals connected to the first transmit port, the first receive chain primary port, and the second receive chain secondary port, as well as a common terminal that is connected to the first antenna port. Additionally, the front end circuit has a second switch that has terminals connected to the second transmit port, the second receive chain primary port and the first receive chain secondary port, and a common terminal connected to the second antenna port.

A space efficient multi-feed antenna apparatus, and methods for use in a radio frequency communications device. In one embodiment, the antenna assembly comprises three (3) separate radiator structures disposed on a common antenna carrier. Each of the three antenna radiators is connected to separate feed ports of a radio frequency front end. In one variant, the first and the third radiators comprise quarter-wavelength planar inverted-L antennas (PILA), while the second radiator comprises a half-wavelength grounded loop-type antenna disposed in between the first and the third radiators. The PILA radiators are characterized by radiation patterns having maximum radiation axes that are substantially perpendicular to the antenna plane. The loop radiator is characterized by radiation pattern having axis of maximum radiation that is parallel to the antenna plane. The above configuration of radiating patterns advantageously isolates the first radiator structure from the third radiator structure in at least one frequency band.

An antenna and RF front-end arrangement include at least one LTE or WCDMA Tx&Rx antenna, one MIMO Rx or diversity antenna adapted for low band LTE or WCDMA and one MIMO Rx or diversity antenna adapted for high band LTE or WCDMA. At least one of the MIMO Rx or diversity antennas is adapted for transmitting and receiving WLAN and / or BlueTooth signals. Therefore, a dedicated WLAN antenna is not required and the number of antennas can be reduced.

The invention discloses a multi-band frequency spectrum aggregating wireless transmitter-receiver device which is characterized in that multi-band simulating radio frequency front ends are aggregated; different radio frequencies are divided into 20 MHz and 60 MHz processing frequency bands; analog-to-digital conversion while receiving a base-band signal and digital-to-analogue conversion while sending are performed in low and intermediate frequencies; and a signal treatment relative to a base-band NC-OFDM modulation-demodulation is performed by a sending base-band processing channel and a receiving base-band processing channel which are dynamically arranged. The invention solves the problem that the prior mobile communication terminal cannot work in multi-band at the same time during the communication process and only can use continuous frequency spectrums. The frequency spectrum aggregating function of the transmitter-receiver device realizes a data rate required by an IMT-Advanced system.

The invention relates to an integrated structure of a radio-frequency front end of a communications apparatus. The antenna of the communications apparatus is constructed on a printed circuit board. To this antenna board (310), on its ground plane side, a second circuit board (321) is attached by means of a rigid protective frame (410), which second circuit board includes the other parts of the radio-frequency front end. Between the parts impedance levels are used that are appropriate from the electrical operation perspective. All said parts together form an integrated component (400) to be located inside the housing of the communications apparatus. The advantage of the invention is that it requires a smaller number of components needed for matching between the RF parts, and makes possible a greater sensitivity of the receiver as well as a better transmitter efficiency than prior art structures.

Methods, systems, and devices are described for transceiver architecture for millimeter wave wireless communications. A device may include two transceiver chip modules configured to communicate in different frequency ranges. The first transceiver chip module may include a baseband sub-module, a first radio frequency front end (RFFE) component and associated antenna array. The second transceiver chip module may include a second RFFE component and associated antenna array. The second transceiver chip module may be separate from the first transceiver chip module. The second transceiver chip module may be electrically coupled to the baseband sub-module of the first transceiver chip module.

The invention provides an antenna system and a mobile terminal, and relates to the technical field of antennas. The antenna system is applied to a mobile terminal, and includes: a first metal arm and a second metal arranged on two end parts of a frame of one side edge of the mobile terminal; and a third metal arm arranged on the frame of the side edge and located between the first metal arm and the second metal arm. A first opening is arranged between the third metal arm and the first metal arm, and a second opening is arranged between the third metal arm and the second metal arm; a first end of the third metal arm is connected to the ground through a radio frequency front end matching circuit; and a second end of the third metal arm is connected to the ground through a first antenna matching circuit. The scheme of the invention solves the problem of poor antenna signal quality when mobile terminals at present use metal structures, realizes antenna signals of higher quality, and tuning is easy.

A wideband RF tracking filter having a set of parallel tuned resonator amplifier stages with a de-Q resistor for each subband is disclosed. The resonant amplifier contains programmable tuned LC tank impedance and an array of parallel voltage to current converters (V2I) for each subband. The de-Q resistor together with the array of V2I converters provides a flat gain over each subband and each of the other subbands covering different frequencies.

This invention discloses a for digital pre-distortion processing method and apparatus, the method including that: training signals are sent to at least one radio frequency front-end device as needed (201); the output training signals of the radio frequency front-end devices are collected through a feedback channel as needed (202); digital pre-distortion (DPD) coefficients of the radio frequency front-end devices are trained as needed (203); after the coefficient training is completed, the DPD coefficients of the corresponding radio frequency front-end devices are updated as needed. There is no need to track the variation of the signals all the time and to compare the signals with a long-time statistical signal template to trigger the training in the invention. The invention can accommodate a multi-antennas application without configuring a corresponding digital pre-distortion feedback channel and coefficient training module separately for each antenna, thereby when the antennas are increased, the volume and cost are not increased and the invention can be of good feasibility from the perspective of commercialization.

The invention discloses a multi-mode multi-frequency global navigational satellite system receiver radio frequency front end device. The device comprises a low-noise amplifier, a power divider, and multiple radio-frequency signal processing circuits, wherein the low-noise amplifier, the power divider, and the multiple radio-frequency signal processing circuits are connected in sequence. Each radio-frequency signal processing circuit comprises a first radio-frequency switch, a radio-frequency filter bank, a second radio-frequency switch, a radio-frequency amplifying module, a lower frequency mixing module, an intermediate frequency filter module, an intermediate frequency amplifying module, and an automatic gain control unit, wherein the first radio-frequency switch, the radio-frequency filter bank, the second radio-frequency switch, the radio-frequency amplifying module, the lower frequency mixing device, the intermediate frequency filter module, the intermediate frequency amplifying module, and the automatic gain control unit are connected in sequence. The lower frequency mixing module comprises a lower frequency mixing device and a local oscillating generating module which are connected with each other. A control unit is connected with the first radio-frequency switch and the second radio-frequency switch of each radio-frequency signal processing circuit and the local oscillating generating module of the lower frequency mixing module. The device can flexibly select intermediate frequency inputting from various combination frequency ranges of a quad-mode 11 frequency range, and therefore functions of collecting in the same module and processing navigation system intermediate frequency signals of four system satellites are realized, namely a global position system (GPS), Glonass, Galileo, and Big Dipper.

The invention provides a framing method of the receiver front-end of multimode satellite navigation, which discloses a frontend chip of the receiving RF of multimode satellite navigation which is applicable to a plurality of satellite navigation systems. The method of the invention comprises six modules which are a multimode PF frontend low-noise amplifier / mixer group of monolithic integrated and completed type, a reconfigurable image rejection filter, a band-variable gain amplifier, an analog-to-digital converser, a configurable frequency synthesizer and a multimode control logic module. The reconfigurable module can realize the distribution of functional parameters according to the requirement through the multimode control logic management, causing the working performance to be optimized and meeting the functional requirement on the RF front end of the receiving platform of multimode satellite navigation. The framing method of the invention requires no external supporting accessories and has the advantages of being easy to carrying out cascade connection with preceding and backward stages, high gain, small noise coefficient and good integration. The invention is applied to the current communication and navigation positioning equipment for receiving multimode satellite navigation signals, has a wide application range and quite remarkable economic benefit, is largely on demand, supports the integration making use of multimode satellite navigation positioning information, improves positioning precision and has large social benefit.

The invention discloses a carrier aggregation device, which comprises a first transmitting and receiving antenna, a second transmitting and receiving antenna, a first radio frequency front end, a second radio frequency front end and a radio frequency transmitting and receiving chip, wherein signals received by the first transmitting and receiving antenna are divided into a way of high-frequency signals, a way of intermediate-frequency signals and a way of low-frequency signals through the first radio frequency front end, and the three ways of signals enter the radio frequency transmitting and receiving chip respectively; and signals received by the second transmitting and receiving antenna are divided into a way of high-frequency signals, a way of intermediate-frequency signals and a way of low-frequency signals through the second radio frequency front end, and the three ways of signals enter the radio frequency transmitting and receiving chip respectively.

The invention relates to a data processor system for space-based measurement and control of a high-speed aircraft. The data processor system comprises a power supply module, an interface module, a control module, an encryption module, a forward processing module and a reverse processing module, wherein the power supply module is used for providing the secondary power source for the other modules; the control module is used for receiving control instructions, and sending the control instructions to the other modules; the encryption module is used for encrypting the reverse data stream and decrypting the forward data stream respectively; the forward processing module is used for receiving the mid-frequency signal, completing the receiving and processing link, recovering forward information, and outputting the forward information to an external device through the interface module; the reverse processing module is used for receiving image data, flight state information and remote measurement information, generating the mid-frequency signal after completing the launching and processing link to output the mid-frequency signal to an external radio frequency front end, and eventually sending the mid-frequency signal to a ground system. The data processor system supports the carrier high-dynamic measurement and control of the aircraft, is large in region coverage, supports multiple users, can realize real-time two-way communication with the aircraft, and has certain interference capability.

The invention relates to a method for constructing a fully-digital GNSS compatible navigation receiver, which comprises four steps: I, constructing a receiving link in accordance with actual needs by taking the characteristics of satellite signals, performance indexes and current device level into comprehensive consideration; II, choosing a proper A / D chip and a proper time clock source to complete direct radio frequency sampling and constructing a sampling rate in accordance with bandwidth sampling requirements; III, constructing a filter decimation network to reduce the sampling rate, completing the down-conversion of the radio frequency, converting the frequency of the bandwidth satellite navigation signals near 1.2G and 1.5G two frequency points down to a low medium frequency under a condition of a high sampling rate, and finally outputting a sampling time clock and a GNSS medium frequency signal; and IV, constructing digital radio frequency front end and rear end medium frequencyreceiver interfaces for making the receiver compatible with other medium frequency receiver. The thought of using software radio realizes the collective receiving of full-range GNSS satellite navigation signals; and the medium frequency receivers can complete navigation solution and output measurement values, so multi-system and multi-frequency point compatible navigation is realized. The method has an application and development prospect in the technical field of communication.

The invention discloses a radio frequency front end device of a receiver and a signal receiving method thereof and belongs to the field of radio communication and satellite positioning and navigation. The device comprises two mutually-independent and parallel signal channels. Each signal channel is connected as follows: a low noise amplifier, a surface acoustic wave filter, a radio amplifier, a quadrature output down-converter, a correction buffer and a multi-mode filter are connected in series; the output end of the multi-mode filter is connected with the input end of a controllable gain amplifier; the output end of the controllable gain amplifier is respectively connected with the input end of an automatic gain controller and the input end of a multi-mode analogue / digital converter; and the output end of the automatic gain controller is connected with a gain control end of the controllable gain amplifier. The invention has the advantages as follows: the radio frequency front end device has system-level and module-level reconfigurability, supports all kinds of the traditional global positioning systems to be the maximum and greatly improves the flexibility of use for users. The radio frequency front end device has strong robustness.

The invention relates to a configurable multimode radio-frequency front end module and a mobile terminal having the same. The configurable multimode radio-frequency front end module comprises a single-pole multi-throw switch, a controller, a low-frequency band radio-frequency power amplifier die, a high-frequency band radio-frequency power amplifier die, a plurality of selector switches and a plurality of output matching networks comprising a plurality of capacitors and inductors, wherein the frequency range of the low-frequency band is 824-915 MHz, and the frequency range of the high-frequency band is 1710-2025 MHz; and the controller is used for controlling the working state of the low-frequency band radio-frequency power amplifier die or the high-frequency band radio-frequency power amplifier die and controlling the single-pole multi-throw switch and the selector switches to select an output matching network corresponding to the low-frequency band radio-frequency power amplifier die or the high-frequency band radio-frequency power amplifier die and transmit low-frequency band signals or high-frequency band signals to an antenna. The invention can reduce the area of a mobile telephone terminal circuit board occupied by the radio-frequency front end module, thereby reducing the volume of the mobile telephone terminal and lowering the cost of the mobile telephone terminal.

A radio frequency communications system with a first operating frequency band and a second operating frequency band is disclosed. There is a first antenna. A transceiver has a first transmission port, a second transmission port, a first reception port, and a second reception port. In a first front end circuit, a first port is coupled to the antenna, and a second port is coupled to the transceiver. The first front end circuit has a first low noise amplifier, a second low noise amplifier, a first power amplifier, and a second power amplifier. A switching circuit connects the first transmission port, the first reception port, the second transmission port, and the second reception port to the second port of the first front end circuit. The antenna is distant from the transceiver, while the first front end circuit is proximal to the antenna. The first switching circuit is proximal to the transceiver.

The invention discloses an analog / digital configurable variable-gain amplifier, which comprises a variable-gain amplifier module VGA and an analog / digital configurable control circuit. The variable-gain amplifier module is formed by a plurality of variable-gain amplifiers and a fixed-gain amplifier in concatenation connection. The analog / digital configurable control circuit comprises an analog mode control circuit and a digital mode control circuit. A comparator and a charge pump of the analog mode control circuit detect the size of amplitude of an output signal, output an appropriate control voltage and feed back the control voltage to the VGA so as to regulate the gain of the VGA. The digital mode control circuit controls an internal switch circuit by means of an external signal, generates the control voltage by means of a decoder and an I-V converter according to an input signal provided by a digital baseband processing module chip and feeds back the control voltage to the VGA so as to change the gain of the VGA. The analog / digital configurable variable-gain amplifier can flexibly switch between an analog mode and a digital mode and is especially suitable for a radio-frequency front end circuit for different baseband chips.

An encoded information reading (EIR) terminal can comprise a microprocessor electrically coupled to a system bus, a memory communicatively coupled to the microprocessor, an encoded information reading (EIR) device, and a wireless communication interface. The EIR device can be selected from the group consisting of a bar code reading device, an RFID reading device, and a card reading device. The EIR device can be configured to perform outputting raw message data containing an encoded message and / or outputting decoded message data corresponding to an encoded message. The wireless communication interface can comprise a radio frequency front end configured to perform receiving a first radio signal and / or transmitting a second radio signal. The radio frequency front end can be electrically coupled to an analog-to-digital converter (ADC) which can be electrically coupled to the system bus and / or to a digital-to-analog converter (DAC) which can be electrically coupled to the system bus. The microprocessor can be configured to execute a base-band encoder software program and / or a base-band decoder software program. The base-band encoder software program can be configured to produce a first encoded bit stream by performing at least one of the following functions: source encoding of a first bit stream, encryption, channel encoding, multiplexing, modulation, frequency spreading, and media access control. The DAC can be configured to output to the radio frequency front end an analog signal corresponding to the first encoded bit stream. The ADC can be configured to output a second encoded bit stream corresponding to an analog signal produced by the radio frequency front end. The base-band decoder software program can be configured to produce a second bit stream corresponding to the second encoded bit stream by performing at least one of the following functions: media access control, frequency de-spreading, de-modulation, de-multiplexing, channel decoding, decryption, and source decoding.