2182results about "Amplifier modifications to reduce noise influence" patented technology

The invention provides a multi-band radio frequency power amplifier dynamic range adaptive test method and a system thereof. The method comprises the following steps: acquiring an output signal frequency spectrum of a tested radio frequency power amplifier, extracting characteristic frequency points including a center frequency and a bandwidth, matching the characteristic frequency points with a preset frequency band database, and automatically loading a test scheme of a corresponding frequency band. According to the method, the frequency bands are automatically matched through spectrum sensing, the test scheme is loaded, the multi-frequency-band characteristics can be rapidly adapted without manual parameter configuration, index missing test is avoided, and the switching efficiency is improved; dynamically optimizing test parameters by using a genetic algorithm, and accurately capturing a nonlinear distortion critical point while balancing coverage and efficiency; by combining multi-dimensional signal analysis and a deep learning model, the problem of missing detection of traditional single-domain analysis is solved, and the abnormal signal recognition capability is remarkably enhanced; through linear model correction, impedance dynamic matching and index threshold iteration, full automation and high precision of the test are realized, the environmental interference influence is effectively reduced, and a self-adaptive test system is constructed.

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 relates to the technical field of electronic circuits, in particular to a low-noise amplification circuit and a radio frequency system. The low-noise amplification circuit at least comprises an amplification input circuit and an amplification output circuit, wherein at least one group of tail inductor structure is arranged in the amplification input circuit and the amplification output circuit; the first resonance circuit is of a closed structure, the first resonance circuit is in coupling connection with the tail inductor structure, and the first resonance circuit is used for discharging current generated by the tail inductor structure; the first resonance circuit at least comprises a secondary coil which is in coupling connection with a primary coil in the tail inductor structure; and the first end of the first capacitor module is electrically connected with the secondary coil. The invention provides a low-noise amplification circuit with higher working stability.

The invention is suitable for the technical field of wireless communication, and particularly relates to a low-noise amplifier and a radio frequency chip. The low noise amplifier comprises an input matching circuit, a biasing circuit, an amplifying circuit, an output matching circuit, an attenuator and an anti-distortion gain suppression circuit. Compared with the prior art, the anti-distortion gain suppression circuit capable of preventing distortion caused by overlarge waveform amplitude is additionally arranged at the joint of the first MOS tube and the second MOS tube of the amplification circuit, and the problem of linearity deterioration caused by overlarge waveform amplitude of a chip amplification link can be effectively reduced through the anti-distortion gain suppression circuit; therefore, the low noise amplifier can output radio frequency signals with better linearity.

The invention provides a low-noise amplification circuit and a radio frequency power amplifier module, and the low-noise amplification circuit comprises an input matching circuit, a cascode amplification structure, an output matching circuit and a path switching assembly. The input matching circuit comprises a first inductor, a second inductor, a first capacitor and a third inductor; the output matching circuit comprises a fourth inductor, a second capacitor, a fifth inductor, a third capacitor and a fourth capacitor; and the access switching assembly is used for selecting channels of the low-noise amplification circuit, so that a radio frequency signal accessed by the first inductor is directly output or output after being amplified by the cascode amplification structure. According to the low-noise amplification circuit, on the premise that the noise coefficient is reduced and the gain is matched, the order of an input and output matching network does not need to be increased, and correspondingly, the cost and the area of the low-noise amplification circuit are not increased.

The invention provides a broadband low-noise amplifier based on a three-coil coupling transformer. The broadband low-noise amplifier comprises an input matching network, a common-source differential output driving stage amplifier, an inter-stage matching network, a common-source differential output power stage amplifier and an output matching network which are connected in sequence, broadband matching is realized by using the input matching network and the inter-stage matching network, and the effective transconductance of the transistor is improved; through the cross-coupled capacitors, the LNA gain and stability on a broadband are improved, better isolation is realized, and input and output are decoupled; due to the design of the grounding capacitor, the linearity of the LNA is improved; through the combination of the three-coil coupling transformer and the differential topology, output signals are superposed in the same direction at the output end, and noise is cancelled in the reverse direction at the output end, so that the thermal noise is greatly inhibited, the isolation is improved through the output matching network, the insertion loss is reduced, and the output matching performance is optimized.

The invention relates to the technical field of integrated circuit design, and particularly discloses a low-noise programmable amplifier, which comprises a first fully-differential amplifier, a second fully-differential amplifier, a third fully-differential amplifier and a fourth fully-differential amplifier, the second fully differential amplifier comprises a pair of differential input ends and is electrically connected with the first fully differential amplifier through an interstage chopper switch; a pair of input chopping switches, wherein the input end of each input chopping switch is electrically connected with a differential input signal; the output end of each output chopping switch is electrically connected with the output end of the second fully differential amplifier; the input capacitance network is positioned between the pair of input chopping switches and the two pairs of differential input ends; the feedback capacitance network is positioned between the pair of output chopping switches and the two pairs of differential input ends; and the plurality of zeroing switches are positioned between the input and the output of the first fully differential amplifier. The two transconductance amplifiers in the first fully-differential amplifier share the same current, the overall transconductance is doubled compared with single-pair differential input, and the noise of the amplifier is reduced.

The invention relates to the field of signal processing, and provides a signal processing method and system for a reconnaissance unmanned aerial vehicle, and the method comprises the steps: carrying out the signal decomposition of a first intermediate frequency signal obtained through the frequency mixing of an unmanned aerial vehicle signal, so as to obtain a set of signal component intrinsic mode functions; a signal analysis and processing algorithm based on deep learning is adopted to carry out waveform semantic feature extraction on the intrinsic mode function of each signal component, so that a filtered first intermediate frequency signal is automatically generated based on the significant dynamic aggregation representation of the waveform semantic feature of each signal component in a global domain; the method can dynamically adapt to the change of a signal environment and extract more representative features so as to improve the flexibility of signal processing. Compared with a traditional fixed parameter filter, the method can better deal with interference and noise in a complex environment, enables the final signal to be clearer, and improves the signal processing quality and automation level of the reconnaissance unmanned aerial vehicle.

The invention relates to the technical field of wireless communication networks, and provides a low-channel electroencephalogram amplification circuit and brain-computer interface equipment oriented to an after-ear electroencephalogram signal, and the low-channel electroencephalogram amplification circuit comprises a dry electrode sensing module which is used for collecting an electroencephalogram signal; the front active amplification module comprises an operational amplifier circuit with high input impedance; the anti-aliasing filtering module is formed by cascading a multi-order passive filtering network and an active filtering circuit, is connected with the output end of the front active amplification module and is used for filtering high-frequency interference signals; the right leg driving feedback module comprises a programmable impedance adjusting circuit and a current limiting protection circuit, the right leg driving feedback module and the front active amplification module form a closed-loop feedback loop, and the output end of the right leg driving feedback module and the human body form a current loop through a protection resistor; the analog-to-digital conversion module adopts an integrated low-power-consumption analog front-end chip; a wireless transmission module; and the power supply management module provides independent power supply for the analog front-end chip, the operational amplifier circuit and the wireless transmission module.

An amplifier circuit includes a high frequency input terminal and a high frequency output terminal, amplifiers, an output transformer having an input-side coil and an output-side coil, inductors, and a bypass capacitor. An output end of the amplifier is connected to one end of the input-side coil and one end of the inductor. An output end of the amplifier is connected to the other end of the input-side coil and one end of the inductor. The other end of the inductor, the other end of the inductor, and one end of the bypass capacitor are connected to a midpoint of the input-side coil. One end of the output-side coil is connected to the high frequency output terminal.

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.

Low noise amplifiers (LNAs) with low noise figure are provided. In certain embodiments, an LNA includes a single-ended LNA stage including an input for receiving a single-ended input signal from an antenna and an output for providing a single-ended amplified signal, a balun for converting the single-ended amplified signal to a differential signal, and a variable gain differential amplification stage for amplifying the differential signal from the balun. Implementing the LNA in this manner provides low noise figure, high gain, flexibility in controlling gain, and less sensitivity to ground / supply impedance.

A matching circuit, a radio frequency front-end circuit, a radio transceiver apparatus, and an electronic device are provided. The radio frequency front-end circuit includes a low noise amplifier and a power amplifier each coupled to an antenna through a matching circuit. The matching circuit includes a transformer, a capacitor, a first switch, and a first inductor element. The transformer is coupled to the power amplifier and the antenna. The capacitor is coupled to the transformer and to the low noise amplifier. The first switch is coupled to the capacitor and to the transformer and is grounded. The first inductor element is coupled to the capacitor and to the first switch and is grounded. A resonant network formed by the first inductor element and the first switch enables the radio frequency front-end circuit to in a wide frequency band.

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.

A squelch detection device is provided. The squelch detection device receives first and second input signals and first and second threshold voltages. The squelch detection device determines a first common mode of the first and second input signals and a second common mode of the first and second threshold voltages. The squelch detection device averages the first common mode with the second common mode to produce an average common mode and sets the first common mode of the first and second input signals to the average common mode. The squelch detection device sets the second common mode of the first and second threshold voltages to the average common mode and determines a state of a squelch signal, indicative of whether the first and second input signals are attributable to noise, based on the first and second input signals and the first and second threshold voltages.

The invention provides a millimeter wave low-noise amplifier which comprises a first-stage amplifying circuit, a second-stage amplifying circuit and a third-stage amplifying circuit, the signal output end of the first-stage amplifying circuit is connected with the signal input end of the second-stage amplifying circuit, and the signal output end of the third-stage amplifying circuit is connected with the signal output end of the third-stage amplifying circuit. The signal output end of the second-stage amplification circuit is connected with the signal input end of the third-stage amplification circuit; according to the low-noise amplifier, the transformer is matched with the transmission line inductor and the transmission line plate capacitor in a combined mode, loss of a passive matching circuit is reduced, and meanwhile large-bandwidth output of the low-noise amplifier is achieved; a cascode amplification structure is adopted, the transformer is combined with a transmission line plate capacitor and a transmission line inductor for impedance matching, and broadband, high-gain amplification and low-noise signal output can be achieved.

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.

The invention provides a dynamic residual amplification circuit based on charge sampling, and relates to the technical field of integrated circuits, the dynamic residual amplification circuit comprises an integrating circuit, a logic circuit, a charge pump and a zero-cross detection circuit, the integrating circuit is connected with the logic circuit and the zero-cross detection circuit, the integrating circuit converts a sampled input differential signal into a constant current, and the constant current is connected with the charge pump. The output node is continuously charged or discharged, so that the input differential signal is converted into a current integral quantity; the zero-cross detection circuit monitors the output voltage of the integrating circuit in real time, and when the output voltage is greater than or equal to the common mode voltage VCM, the moment when the output voltage is equal to the common mode voltage VCM is converted into a digital clock edge; the logic circuit is connected with the charge pump and outputs digital pulses to the charge pump according to the digital clock edge so as to control the reset time sequence of the whole dynamic residual amplification circuit; the charge pump is configured to output a residual voltage modulated by the digital pulse in response to the digital pulse. The application helps to improve the linearity of the residual signal.

The invention discloses a differential closed-loop negative feedback amplification circuit based on JFET geminate transistors, a low-noise amplifier is used for measuring weak voltage signals, discrete JFET field-effect transistors are used for forming an input stage of the low-noise amplifier, noise interference is reduced, meanwhile, extremely high input impedance can be provided by using the characteristic that the grid current of the JFET field-effect transistors is basically zero, and the differential closed-loop negative feedback amplification circuit based on the JFET geminate transistors is obtained. Mirror current is provided for a pair of JFET field effect transistors in the low-noise amplifier module through a current mirror of the low-noise amplifier, a closed-loop feedback structure of the low-noise amplifier can save one path of input for the JFET field effect transistors, so that the amplifying circuit can realize dual-channel input, and a dual-channel input structure can enable an accessed signal to be a differential signal, so that common-mode interference is effectively inhibited, and the reliability of the amplifying circuit is improved. Overall closed-loop negative feedback can achieve high gain stability, reduce nonlinear distortion, increase input impedance, reduce output impedance and improve the performance of the amplifier, and solves the problem of precise amplification and measurement of weak voltage signals in the aviation electromagnetic field.

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 technical field of radio frequency integrated circuits, in particular to a harmonic suppression power amplifier combining a matching network and a feed network, which comprises a transistor, an input matching module, an output matching module, a stabilizing module and a bias module, the input matching module comprises a first parallel resonance unit, the first parallel resonance unit is used for second harmonic suppression, the output matching module comprises a series resonance unit and a second parallel resonance unit, the series resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic, and the second parallel resonance unit is used for resonating at a second harmonic frequency and performing low-impedance grounding on the second harmonic. The second parallel resonance unit is used for resonating at a third harmonic frequency and forms a high-impedance open circuit for the third harmonic, the output matching module is coupled to a drain electrode of the transistor, and the bias module comprises a grid bias sub-module and a drain bias sub-module. The grid bias sub-module is coupled to a connection node of the input matching module and the grid of the transistor, the drain bias sub-module is coupled to the output matching module, and the bias voltage of the transistor is jointly determined by the grid bias sub-module and the drain bias sub-module. The power amplifier has the effect of improving the efficiency level of the power amplifier while realizing harmonic suppression optimization.

According to one embodiment, a low noise amplifier (LNA) circuit includes a first stage which includes: a first transistor; a second transistor coupled to the first transistor; a first inductor coupled in between an input port and a gate of the first transistor; and a second inductor coupled to a source of the first transistor, where the first inductor and the second inductor resonates with a gate capacitance of the first transistor for a dual-resonance. The LNA circuit includes a second stage including a third transistor; a fourth transistor coupled between the third transistor and an output port; and a passive network coupled to a gate of the third transistor. The LNA circuit includes a capacitor coupled in between the first and the second stages, where the capacitor transforms an impedance of the passive network to an optimal load for the first amplifier stage.

The invention belongs to the technical field of sensor signal amplification, and discloses a vibration cylinder pressure sensor signal amplification circuit and a vibration cylinder pressure sensor.The vibration cylinder pressure sensor signal amplification circuit comprises a filter circuit, a gain adjusting circuit, a phase adjusting circuit, an amplitude limiting circuit, a frequency detection circuit and a temperature detection circuit; amplitude adjustment of a certain gain is achieved through a gain adjusting circuit, a gain amplification signal VB is obtained and input to a phase adjusting circuit and a frequency detection circuit, the phase adjusting circuit outputs a square wave signal VC and inputs the square wave signal VC to an amplitude limiting circuit, and the amplitude limiting circuit outputs an amplitude limiting square wave signal VD and loads the amplitude limiting square wave signal VD to a vibration cylinder; a gain amplification signal VB output by the gain adjusting circuit passes through the frequency detection circuit, a square wave frequency signal VO is output, a closed-loop control system is formed to achieve driving and detection of the resonance cylinder pressure sensor, and the actual frequency of the vibration cylinder body depends on the sensed pressure.

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.

The invention relates to the technical field of wireless communication, and provides a power amplifier and a radio frequency front-end module, and the power amplifier comprises an input matching circuit, a first-stage amplifier, a second-stage amplifier, an inter-stage matching circuit and a third-stage amplifier which are electrically connected in sequence; the first current unit, the second current unit and the third current unit respectively provide bias current for the input end of the first-stage amplifier, the input end of the second-stage amplifier and the input end of the third-stage amplifier; the first-stage amplifier comprises a first triode, a first resistor, a first capacitor and a first inductor, the base electrode of the first triode serves as the input end of the first-stage amplifier, the emitter electrode of the first triode is connected with the first resistor in series and then grounded, and the collector electrode of the first triode is connected with the first end of the first inductor and the first end of the first capacitor; the second end of the first capacitor serves as the output end of the first-stage amplifier. The power amplifier disclosed by the invention can be used for reducing the output nonlinear noise under the condition of meeting high gain.

A system includes: an inverter, wherein the inverter includes: a power module including: a flex layer including a gate trace, a first substrate, a second substrate including a source plane and a gate plane separated from the source plane by a full trench, the source plane including a step trench, and the gate plane including an electrical connection through the gate trace of the flex layer to a gate input connection of the power module, a semiconductor die disposed between the first substrate and the second substrate, the step trench formed in a portion of the source plane corresponding to at an edge of the semiconductor die, and the semiconductor die including a gate connected to the gate plane, and a sinter element disposed between the semiconductor die and the second substrate to connect the semiconductor die to the second substrate; a battery; and a motor.

An example apparatus includes: current source circuitry having a first terminal, a second terminal, a third terminal, and a fourth terminal; current sink circuitry having a first terminal, a second terminal, a third terminal, and a fourth terminal; common mode voltage circuitry having a first terminal and a second terminal, the first terminal of the common mode voltage circuitry coupled to the first terminal of the current source circuitry and the first terminal of the current sink circuitry, the second terminal of the common mode voltage circuitry coupled to the second terminal of the current source circuitry and the second terminal of the current sink circuitry; idle current source circuitry having a terminal coupled to the third terminal of the current source circuitry; and feedback current source circuitry having a terminal coupled to the fourth terminal of the current source circuitry.

The invention provides a voltage amplifier and a preparation method thereof, which can be applied to the technical field of voltage amplifiers. The voltage amplifier method includes: a noise matching transformer including a primary winding, a secondary winding, and a magnetic core, the noise matching transformer being configured with a target number of turns of the primary winding and a target number of turns of the secondary winding, thereby reducing noise of the active amplifier, the target number of turns of the primary winding is determined according to at least one of the first number of turns and the second number of turns, the target number of turns of the secondary winding is determined according to the signal source resistance, the resistance of the primary winding and the single-turn average resistance of the secondary winding, and the primary winding comprises a first tap and a second tap, the secondary winding comprises a positive tap, a negative tap and a center tap; the active amplifier is used for amplifying the signal source voltage according to the gain of the active amplifier, and the gain of the active amplifier is determined according to the target number of turns of the primary winding and the target number of turns of the secondary winding.

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.