1159 results about "Low-noise amplifier" patented technology

The invention relates to the technical field of wireless communication, and provides a radio frequency low-noise amplifier which comprises an input matching module, a power amplification module, an output matching module, an RC attenuation module and an RC feedback module, the first end of the first inductor serves as the input end of the output matching module, the first end of the first inductor is connected with the output end of the power amplification module, the control end of the switch and the first end of the first adjustable resistor, and the second end of the first inductor is connected with the first end of the second inductor and the first end of the third capacitor. The output end of the switch is connected with the first end of the first capacitor and the first end of the second capacitor. The second end of the second capacitor is connected with the second end of the first adjustable resistor and the second end of the second inductor and used for being connected with a power supply. The second end of the first capacitor is connected with the second end of the third capacitor and serves as the output end of the output matching circuit. The radio frequency low-noise amplifier is adjustable in gain, low in noise and good in linearity performance.

The invention discloses a noise elimination circuit structure, a low noise amplifier, a chip and electronic equipment. The noise elimination circuit structure comprises an input matching network; a common source stage amplification path connected with the first differential output end of the input matching network, comprising a first common source stage differential amplifier, and outputting an amplified first signal inverted from the radio frequency input signal to the ground; the common-gate amplification path is connected with the second differential output end of the input matching network, comprises a first common-gate differential amplifier and outputs an amplified second signal which is opposite to the radio frequency input signal to the ground; and the output end of the common-source amplification path and the output end of the common-gate amplification path are connected in parallel to form the output end of the noise elimination circuit structure. The common-source amplification path and the common-gate amplification path required by the noise elimination structure are realized by using one amplifier path, the utilization rate of the layout area is improved, the compactness of the layout is realized, and the amplifier can be widely applied to the field of communication or radar.

Front end systems and related devices, integrated circuits, modules, and methods are disclosed. One such front end system includes a low noise amplifier in a receive path and a multi-mode power amplifier circuit in a transmit path. The low noise amplifier includes a first inductor, an amplification circuit, and a second inductor magnetically coupled to the first inductor to provide negative feedback to linearize the low noise amplifier. The multi-mode power amplifier circuit includes a stacked output stage including a transistor stack of two or more transistors. The multi-mode power amplifier circuit also includes a bias circuit configured to control a bias of at least one transistor of the transistor stack based on a mode of the multi-mode power amplifier circuit. Other embodiments of front end systems are disclosed, along with related devices, integrated circuits, modules, methods, and components thereof.

The invention discloses an interference elimination method for a same-time and same-frequency time synchronization system, which is suitable for a microwave time synchronization networking system and is characterized in that radio frequency domain self-interference cancellation is carried out before a signal received by a receiving end of a time synchronization networking node from an antenna enters a low noise amplifier; the introduced offset signal is obtained by coupling a part of a transmitting signal before the transmitting end enters an antenna from the transmitting end of the node, and correcting amplitude, time delay and phase through radio frequency reconstruction. The invention further discloses a same-time and same-frequency time synchronization system, the time synchronization networking node comprises a transmitting end, and a receiving end is connected to a receiving and transmitting antenna through a circulator; and a radio frequency self-interference suppression module is arranged between a first port of the circulator connected with the output of the transmitting end and a third port of the circulator connected with the input of the receiving end to sample a radio frequency signal output by the transmitting end and then realize radio frequency reconstruction, so as to generate an offset signal to be coupled to the input of the receiving end.

The invention discloses a magnetic particle imaging signal processing link and method based on adjustable external compensation, and the link is characterized in that a signal generator is respectively connected with the input ends of a first power amplifier and a second power amplifier through a first output end and a second output end, the output end of the first power amplifier is connected with the input end of a first capacitor, and the output end of the second power amplifier is connected with the input end of a second capacitor; the output end of the first capacitor is connected with the input end of the receiving excitation module, the output end of the second power amplifier is connected with the input end of the second capacitor, the output end of the second capacitor is connected with the input end of the compensation excitation module, and the output ends of the receiving excitation module and the compensation excitation module are connected with the input end of the low-noise amplifier. The output end of the low-noise amplifier is connected with the input end of the acquisition card, the output end of the acquisition card is connected with the input end of the central processing unit, and the output end of the central processing unit is connected with the input end of the signal generator. According to the invention, the sensitivity and the imaging quality of the MPI equipment are obviously improved.

The invention discloses a C / X wave band ultra-wideband GaAs MMIC low-noise amplifier, and mainly relates to the technical field of radio frequency front ends. Comprising an input matching network used for receiving a radio frequency signal and performing impedance matching so as to effectively transmit the signal to a subsequent active amplification part; and the active amplification part adopts an improved cascode-cascode cascade amplification structure and is used for amplifying the radio frequency signal transmitted by the input matching network. The amplifier has the advantages that an improved cascode-cascode cascade amplification structure is adopted, the gain is improved through an improved Cascode structure, the noise coefficient of the circuit is reduced, and the performance indexes of ultra wide band, low noise and high gain are achieved. The design of the structure not only improves the overall performance of the amplifier, but also enables the amplifier to keep stable gain output in a broadband range, and effectively solves the problems of low gain and high noise of a traditional low-noise amplifier in broadband application.

Embodiments disclosed herein relate to impedance matching for outputting wide-band signals in radio frequency applications. In an example, a circuit including a low-noise amplifier (LNA) sub-circuit and a tuning sub-circuit is provided. The LNA sub-circuit is configured to couple to an antenna and includes a transistor that includes a gate, a source, and a drain, a first inductor that includes a first terminal configured to couple to the antenna and includes a second terminal, a second inductor that includes a first terminal coupled to the first terminal of the first inductor and includes a second terminal coupled to the gate of the transistor, and a third inductor that includes a first terminal coupled to the source of the transistor and includes a second terminal. The tuning sub-circuit is coupled to the source of the transistor.

Methods and devices to improve nonlinearity performance of low noise amplifiers (LNAs) are disclosed. The described methods and devices reduce the capacitive loading of the LNA amplifying devices on the bypass path of the LNAs when operating in the bypass mode. This is performed by decoupling the active devices from ground to put the amplifying devices in a floating state, thus minimizing the impact of the gate-source capacitances of the amplifying devices on the overall linear performance of the LNA operating in the bypass mode.

The invention relates to a folded cascode low noise amplifier. The disclosed low noise amplifiers (LNAs) include a common emitter amplifier (CE-A), a common gate amplifier (CG-A), and various passive devices located in CE-A and CG-A. The CE-A includes an NPN type bipolar junction transistor (BJT) having emitter and collector (E / C) regions, and a base region located between the E / C regions and connected to an input node. The CG-A includes a P-channel field effect transistor (PFET) having source and drain (S / D) regions, a channel region between the S / D regions, and a gate adjacent to the channel region. A drain region of the PFET is connected to the output node. Further, the common inductor, the collector region of the BJT, and the source region of the PFET are connected at an intermediate node. The LNA is implemented on a three-dimensional integrated circuit (3DIC) in which the BJT and the FET are located on different chips and the passive device is located in a back-end-of-line region between the BJT and the FET.

Disclosed is a technology related to a low noise amplifier applied between an RF receiver and an RF switch. A phase difference matching circuit having the same phase difference as a positive gain amplifier is added to an output terminal of an attenuator of a low noise amplifier having a variable gain switching structure. In addition, a variable impedance circuit connected to an output terminal of the positive gain amplifier and an output terminal of a phase difference matching unit to finely adjust the phase difference of each output terminal may be further included.

The invention relates to the field of radar detection methods, and discloses a microwave photon multiband radar detection method, which comprises the following steps: generating detection signals of multiple bands based on a microwave photon method, transmitting the detection signals to a target, and then carrying out dechirp processing and digital signal processing on target reflection signals to obtain a target detection result. The method specifically comprises the following steps: generating a fundamental frequency signal through a user-defined bit sequence generator, a pulse generator and an electric frequency modulator, adjusting the central wavelength and bandwidth of a signal waveform by the electric frequency modulator, amplifying the power of the fundamental frequency signal by a certain multiple through an electric power amplifier, and modulating by a distributed feedback semiconductor laser, a plurality of sidebands with equivalent power are generated by the spectrum of the optical fiber, a modulated fundamental frequency signal is input into the photoelectric detector through the optical fiber, and then the modulated fundamental frequency signal is amplified by the electric low noise amplifier to generate a multi-band frequency modulation signal. And the multifunctional detection capability of the radar system can be realized.

A disclosed low noise amplifier (LNA) includes a common-emitter amplifier (CE-A), a common-gate amplifier (CG-A) and various passive devices in CE-A and CG-A. CE-A includes an NPN-type bipolar junction transistor (BJT) with emitter and collector (E / C) regions and a base region between the E / C regions and connected to an input node. CG-A includes P-channel field effect transistor (PFET) with source and drain (S / D) regions, a channel region between the S / D region, and a gate adjacent to the channel region. The drain region of the PFET is connected to an output node. Additionally, a common inductor, collector region of the BJT, and source region of the PFET are connected at an intermediate node. The LNA is implemented on a three-dimensional integrated circuit (3DIC) with the BJT and FET on different chips and with passive devices in back end of the line regions between the BJT and FET.

Front end systems and related devices, integrated circuits, modules, and methods are disclosed. One such front end system includes a low noise amplifier in a receive path and a multi-mode power amplifier circuit in a transmit path. The low noise amplifier includes a first inductor, an amplification circuit, and a second inductor magnetically coupled to the first inductor to provide negative feedback to linearize the low noise amplifier. The multi-mode power amplifier circuit includes a stacked output stage including a transistor stack of two or more transistors. The multi-mode power amplifier circuit also includes a bias circuit configured to control a bias of at least one transistor of the transistor stack based on a mode of the multi-mode power amplifier circuit. Other embodiments of front end systems are disclosed, along with related devices, integrated circuits, modules, methods, and components thereof.

The invention belongs to the technical field of cognitive radio, and particularly relates to an open set modulation identification method based on time-frequency domain feature learning and fusion. The method comprises the following steps of: receiving a signal by adopting a receiving antenna through electromagnetic spectrum monitoring equipment, capturing a space electromagnetic radiation signal, converting the space electromagnetic radiation signal into an electric signal, amplifying the signal through a low-noise amplifier, performing frequency conversion and filtering through an analog receiver, and converting the received signal into an intermediate-frequency signal. Then, the signal is digitalized through AD sampling, and the intermediate frequency signal is converted into a baseband complex signal through frequency mixing and digital filtering in a digital receiver. Then performing time domain characterization calculation and frequency domain characterization calculation on the signal sampling data to form a plurality of time domain characterization vectors and a plurality of frequency domain characterization vectors; and then the vectors are sent to a trained deep neural network model, reasoning is carried out by using the network model, a reasoning result is post-processed, and a signal modulation identification result is finally obtained. According to the invention, the recognition accuracy of unknown signals is improved.

The invention provides a low-noise amplification circuit, a radio frequency front-end module and an electronic terminal.The low-noise amplification circuit comprises an input matching adjustment circuit, a common-source amplification circuit, a first inductor, an inter-stage feedback circuit, a common-gate amplification circuit, an input and output feedback circuit, an output matching adjustment circuit and an output attenuation circuit; the common-source amplification circuit comprises at least two first signal amplification units; each first signal amplification unit comprises a first field effect transistor; the common-gate amplification circuit comprises at least two second signal amplification units; and each second signal amplification unit comprises a second field effect transistor. According to the low-noise amplification circuit, transconductance nonlinearity of devices under different bias signals can be mutually counteracted, so that the linearity fluctuation of the low-noise amplification circuit at different temperatures is optimized, and the linearity of the low-noise amplification circuit is kept basically not to change along with the temperature change.

The present disclosure is directed to low noise amplifiers built as a monolithic millimeter or microwave integrated circuit (MMIC) that includes an amplification stage with two or more field effect transistors (FETS) connected in a parallel configuration. An amplifier may include two, three, or more amplification stages. Amplifiers consistent with the present disclosure may operate at frequencies in the range of 3 gigahertz (GHz) to 9 GHz. Each transistor or amplification stage may include their own series feedback element. A second amplification stage may include two parallel transistors, with one having a series feedback element and a feedback shunt spanning the second stage. A third stage may include a single transistor. Each of the transistors connected in a parallel configuration may be tuned to a different corner frequency in order to improve metrics of noise figure, gain, input return loss, and output return loss not possible with conventional amplifier designs.

The invention discloses a K-band amplitude-limiting low-noise amplifier, and belongs to the technical field of radio frequency microelectronics. The circuit comprises an input matching module, a diode amplitude limiting module, an inter-stage matching module, a low-noise amplification module and an output matching module which are cascaded in sequence, the input matching module is used for realizing impedance matching between a radio frequency signal input end and the diode amplitude limiting module and transmitting a radio frequency signal; the diode amplitude limiting module is used for limiting the amplitude of the radio frequency signal and transmitting the radio frequency signal; the inter-stage matching module is used for realizing impedance matching between the diode amplitude limiting module and the low-noise amplification module; the low-noise amplification module is used for carrying out amplification processing on the radio frequency signal after amplitude limiting and transmitting the radio frequency signal; and the output matching module is used for realizing impedance matching between the low-noise amplification module and the radio frequency signal output end and outputting the amplified radio frequency signal. According to the invention, the amplitude of the input signal can be limited, so that the amplitude is kept in a bearable range of the low-noise amplification circuit, and the stability and reliability of the whole system are ensured.

An apparatus, including: a receiver including a low noise amplifier (LNA) configured to amplify a received radio frequency (RF) signal based on a first protocol; a transmitter configured to generate a transmit RF signal based on a second protocol; and a first control circuit configured to control a gain of the LNA based on information regarding the transmit RF signal and the received RF signal.

Aspects of the present disclosure provide a circuit configured to adjust an input impedance of an amplifier such as a low-noise amplifier. In certain aspects, the circuit is coupled to a node, wherein the node is between a first transistor and a second transistor of the amplifier. The circuit may include an inductor and a capacitor coupled in series, wherein the inductor is coupled with one or more load inductors of the amplifier through negative magnetic coupling.

The invention provides a Q / V frequency band large-scale satellite communication load channel optimization method, which comprises a forward input link and a backward output link, and is characterized in that the forward input link comprises a V frequency band multi-beam antenna feed source array, a plurality of input preselectors, a V frequency band low noise amplifier input switch ring and a V / Ka integrated receiver assembly which are connected in sequence; the output end of the V-band multi-beam antenna feed source array is connected with the input end of the V / Ka integrated receiver assembly through a waveguide. The reverse output link comprises a Ka / Q frequency converter, a Q-band channel filter, a Q-band traveling wave tube amplifier, a change-over switch, a Q-band output duplexer or filter and a Q-band feed beam which are connected in sequence, and the output end of the Ka / Q frequency converter is connected to the input end of the Q-band channel filter through a waveguide; and the output end of the Q-band channel filter is directly connected to the input end of the Q-band traveling wave tube amplifier through the waveguide. Therefore, the method is low in link loss, high in space utilization rate and high in feasibility.

The invention provides a container supervision article verification method based on the radio frequency identification technology, and relates to the technical field of container supervision article verification based on the radio frequency identification technology, and the method comprises the steps: transmitting a wireless signal to a tag on the surface of an article through RFID equipment, and enhancing a received reflection signal through a low-noise amplifier, filtering environmental noise by using a band-pass filter, converting a filtered reflected signal into a time domain signal by using an analog-to-digital converter, and extracting frequency domain characteristics by using FFT (Fast Fourier Transform) so as to calculate a waveform characteristic index; establishing a historical fingerprint template library, storing a waveform characteristic index corresponding to each state, setting a dynamic similarity threshold value based on historical data distribution, screening out templates of which the Euclidean distance is smaller than the threshold value and which belong to the same state as candidates, and if the candidate templates are not empty, selecting the state corresponding to the template of which the Euclidean distance is minimum as a judgment result; and if the candidate template is empty, the state is judged to be abnormal, and container opening alarm is triggered.

Front-end architectures for simultaneous transmit and receive operation are provided herein. In certain embodiments, a front-end module includes a bandpass filter, an antenna terminal for connecting to an antenna, a power amplifier, a low noise amplifier, and a plurality of switches for controlling access of the power amplifier and the low noise amplifier to the antenna terminal. The switches are operable in a transmit mode in which the switches connect an input of the power amplifier to the bandpass filter and an output of the power amplifier to the antenna terminal, and a receive mode in which the switches connect the input of the low noise amplifier to the antenna terminal through the bandpass filter.

The invention provides a radio frequency power division unit, a radio frequency power division module and a radio frequency receiving system. The radio frequency power division unit comprises a first low noise amplifier, a first single-pole single-throw radio frequency switch, a second single-pole single-throw radio frequency switch, a third single-pole single-throw radio frequency switch, a power divider, a fourth single-pole single-throw radio frequency switch and a fifth single-pole single-throw radio frequency switch; the input impedance of the input end of the power divider, the impedance of the first output end of the power divider and the impedance of the second output end of the power divider are all the same. According to the radio frequency power dividing unit in the embodiment, the impedance of the two output ends of the power divider can be completely matched with the input impedance of the transceiver connected with the rear stage of the power divider, so that the transmitted radio frequency energy cannot be reflected, and the maximum transmission of the radio frequency energy is realized.

The invention provides a low-noise amplifier and a radio frequency front-end module, and the low-noise amplifier comprises an input matching circuit, a first-stage power amplification circuit, an inter-stage matching circuit, a second-stage power amplification circuit and an output matching circuit. The inter-stage matching circuit comprises a first inductor, a second inductor and a first capacitor; the second-stage power amplification circuit is of a cascode structure; and the output matching circuit comprises a third inductor and a fourth inductor which are coupled with each other. According to the low-noise amplifier, the high-frequency gain, the in-band gain flatness, the isolation degree, the stability and the output matching bandwidth of the low-noise amplifier can be improved.

The utility model provides a kind of electrostatic discharge protection circuit and low noise amplification module, the electrostatic discharge protection circuit is applied to low noise amplification circuit, the low noise amplification circuit includes input matching circuit and the low noise amplifier of the output end being connected to the input matching circuit;The electrostatic discharge protection circuit includes inductance and resistance;The first end of the inductance is used to connect to the signal input end of low noise amplifier;The first end of the resistance is connected to the second end of the inductance, and the second end of the resistance is grounded.The electrostatic discharge protection circuit in the utility model is connected to the input end of low noise amplifier, and the noise coefficient of low noise amplifier will not be deteriorated, and the performance of low noise amplifier will not be affected, and the input stability of low noise amplifier will not be affected simultaneously.

The utility model relates to the technical field of wireless communication, and provides a low noise amplifier and a radio frequency chip, comprising an input matching circuit, a power amplification circuit and an output matching circuit which are electrically connected in sequence, the power amplification circuit comprises a first MOS tube and a second MOS tube, the grid electrode of the first MOS tube is used as the input end of the power amplification circuit and is connected to the output end of the input matching circuit, the source electrode of the first MOS tube is grounded, the drain electrode of the first MOS tube is connected with the source electrode of the second MOS tube, and the drain electrode of the second MOS tube is used as the output end of the power amplification circuit and is connected to the input end of the output matching circuit; the low-noise amplifier further comprises an inductance switching circuit capable of being combined into different inductance values, and the source electrode of the first MOS tube is connected with the inductance switching circuit in series and then is grounded. According to the low-noise amplifier, switching of various inductance values of the source electrode inductor can be achieved, and higher flexibility is brought to compromise of indexes of low-gain gears.

An integrated photonics millimeter wave (MMW) radar communication system based on analog phase modulation scheme includes an integrated photonics MMW radar communication signal transmitter, a radar receiver, and a communication receiver. The transmitter includes a radar communication signal analog phase modulation module, an optical frequency comb (OFC) module, an electro-optic modulator (EOM), an optical shaping filter, an optical power divider, a photoelectric detector, an electric power amplifier, and a transmitting antenna that are cascaded sequentially. The radar receiver includes a radar receiving antenna, an electric low-noise amplifier (LNA), an optical phase modulator, an optical bandpass filter (BPF), a low-speed photoelectric detector, an electric low-pass filter, and a low-speed oscilloscope that are cascaded sequentially. In the communication receiver, a communication receiving antenna is sequentially cascaded with an electric LNA, a frequency mixer, and an oscilloscope, and a voltage-controlled oscillator is cascaded with a frequency multiplier and then connected to the frequency mixer.

Circuits and methods for providing ESD protection, particularly for LNAs lacking a DC blocking input capacitor (“capless LNAs”). Novel circuitry provides both improved ESD protection and an improved Noise Figure compared to conventional designs. One embodiment includes an integrated circuit including a voltage source pin and a plurality of low-noise amplifiers lacking a respective DC blocking input capacitor, each of the plurality of low-noise amplifiers including: a voltage source terminal coupled to the voltage source pin, an input terminal configured to receive a signal to be amplified, an output terminal configured to output an amplified version of the received signal to be amplified, an ESD protection circuit coupled to the input terminal and to both the voltage source terminal and a reference potential, and a distributed ESD clamp coupled between the reference potential and a node located between the ESD protection circuit and the voltage source terminal.

The invention discloses a low-noise harmonic suppression radio frequency system for filter band control. The low-noise harmonic suppression radio frequency system comprises a Chebyshev low-pass frequency hopping filter, a power element parameter control module, a harmonic suppression module and a low-noise amplifier, wherein the Chebyshev low-pass frequency hopping filter comprises a plurality of power elements; an external radio frequency signal is used as the input of the Chebyshev low-pass frequency hopping filter, and the output end of the external radio frequency signal is connected with the input end of the harmonic suppression module; the power element parameter control module is connected with a power element of the Chebyshev low-pass frequency hopping filter through a multiplexer switch; the input end of the harmonic suppression module is connected with the output end of the Chebyshev low-pass frequency hopping filter; the low noise amplifier is connected with the output end of the harmonic suppression module; the input end of the low-noise amplifier is connected with the output end of the harmonic suppression module. Through cooperative work of the modules, radio frequency signals can be efficiently processed, and the targets of frequency band control, harmonic suppression and noise suppression are achieved.

The invention discloses a low-noise amplifier applied to millimeter waves, the low-noise amplifier comprises a first-pole cascode amplification circuit and a second-pole cascode amplification circuit, the first-pole cascode amplification circuit comprises NMOS (N-channel metal oxide semiconductor) transistors NM1 to NM2, mutual inductor inductors L1 to L2 with the mutual inductance coefficient of K1, capacitors C1 to C3, mutual inductor inductors L4 to L5 with the mutual inductance coefficient of K2 and an inductor L3; and the second-stage common-source amplification circuit comprises an NMOS transistor NM3, inductors L6-L8 and a capacitor C4. The input end of the low-noise amplifier disclosed by the invention uses the coupled resonator to carry out impedance matching for compensating a narrower working bandwidth caused by the single resonant frequency of the source degeneration inductor amplifier, so that the working bandwidth of the low-noise amplifier is improved. The low-noise amplifier is simple in function implementation mode, and has high gain flatness and noise flatness on the basis of function implementation.