676results about "Amplifier combinations" patented technology

A cascade amplification circuit module based on complementary parameter amplifiers belongs to the technical field of integrated circuit amplifiers and comprises a first-stage complementary parameter amplifier (CPA) and a second-stage amplifier (floating inverting type or transconductance resistance type). The first-stage CPA adopts an NMOS and PMOS complementary structure, passive amplification is achieved through grid multiplexing, a grid capacitor is used for storing signals in the sampling stage, a depletion layer capacitor is switched to improve gain in the amplification stage, common-mode voltage is stabilized through complementary design, and an extra feedback circuit is not needed. And the second-stage amplifier provides driving capability and is combined with passive gain to suppress noise. The cascade structure does not need frequency compensation, the design is simplified, the problem of balancing gain, noise and power consumption of a traditional amplifier is solved, and the cascade amplifier has the advantages of being high in energy efficiency and low in complexity.

The invention relates to the technical field of amplifiers, and discloses an analog-to-digital converter combination instrument amplifier which comprises a first-stage amplifier, the first-stage amplifier is in signal connection with a second-stage amplifier, the second-stage amplifier is in signal connection with a front-end low-pass filter (LPF), the front-end low-pass filter (LPF) is in signal connection with an analog-to-digital converter (ADC), and the analog-to-digital converter (ADC) is in signal connection with the analog-to-digital converter. And an unbalanced input-to-balanced differential circuit output module is arranged between the second-stage amplifier signal and a front-end low-pass filter (LPF). From the perspective of signal processing and conversion, a precise signal transition bridge is constructed by adding an unbalanced input-to-balanced differential circuit output module, unbalanced signals output by a second-stage amplifier are converted into double-end balanced differential signals, common-mode noise interference is effectively resisted through a differential transmission mode, the signal purity is guaranteed, and the signal quality is improved. The front-end low-pass filter and the analog-to-digital converter are adaptive to differential signals, so that the signal transmission is stable and anti-interference, and the analog-to-digital conversion is more accurate.

A current sense amplifier measures a voltage drop in a drive transistor LS to measure the current flowing through the drive transistor LS. The current sense amplifier includes a preamplifier pre-amp, to which a voltage across the drive transistor LS is inputted, and which obtains a positive output and a negative output corresponding to a voltage difference of the inputted voltage across the drive transistor; and a switch sw, which connects the input end of a common mode voltage vcm and the negative output, the common mode voltage vcm serving as the operation reference of the preamplifier pre-amp. A change of the positive output caused by turning on / off the switch sw can be detected.

According to embodiments, a method performed by an electronic device includes: identifying a channel bandwidth; identifying one or more active DPD units among a plurality of DPD units of a digital pre-distortion (DPD) circuit based on the channel bandwidth and amount of resource allocated within the channel bandwidth; generating a DPD output signal of the DPD circuit based on the one or more active DPD units; generating an amplifier output signal based on the DPD output signal of the DPD circuit, a digital-to-analog converter (DAC), and a power amplifier (PA). While the DPD output signal is generated, at least one DPD unit different from the one or more active DPD units among the plurality of DPD units of the DPD circuit is deactivated.

The invention provides an ion detection amplifier and an ion detection method, and belongs to the field of mass spectrometers. The ion detection amplifier provided by the invention comprises a primary amplification circuit used for receiving a current signal output by an ion detector; the load module is connected with the primary amplification circuit in parallel, and the load module comprises a plurality of feedback branches; the secondary amplification circuit is connected with the output end of the primary amplification circuit, is used for amplifying an output signal of the primary amplification circuit, and is provided with a plurality of secondary gain gears; the gain switching control circuit is respectively connected with the load module and the secondary amplification circuit; and the signal processing circuit is used for receiving an output signal of the secondary amplification circuit. According to the ion detection amplifier and the ion detection method provided by the invention, collection, amplification, switching and digital output of ion signals can be accurately and efficiently completed in a complex scene.

The invention discloses a wide dynamic underwater sound acquisition method suitable for an underwater glider and a hydrophone, and the method comprises the steps: configuring a unique hydrophone into four parallel band-pass filtering and amplifying circuits, each band-pass filtering and amplifying circuit having different acquisition frequency bands; after the underwater glider enters water, underwater sound collection is carried out based on the only installed hydrophone, and underwater sound signals of four collection frequency bands are collected at the same time through four parallel band-pass filtering and amplifying circuits. Through four paths of differentiated gains and frequency segmentation, the wide dynamic full frequency band can be covered, the dynamic range is improved, a single hydrophone integrates four channels, cables and installation space among multiple devices are saved, and the underwater glider compact layout is adapted; the channels are activated on demand, the total power consumption can be reduced, and the endurance time is prolonged. Under the conditions of low power consumption and limited volume of the underwater glider, wide dynamic range signal acquisition can be realized, and signals can be processed in real time.

Example embodiments relate to power amplifiers and Doherty amplifiers that include the same. One example embodiment includes a power amplifier. The power amplifier includes one or more radiofrequency (RF) output terminals. The power amplifier also includes a Gallium Nitride (GaN) semiconductor die on which a power field-effect transistor (FET) is integrated. The FET includes a plurality of FET cells that are adjacently arranged in a row. The FET cells are connected either directly or indirectly to the one or more RF output terminals via a respective first inductor. For FET cells arranged at opposing ends of the row of FET cells, a total FET cell gate width and an inductance of the first inductor is larger and smaller than the total FET cell gate width and inductance of the first inductor for one or more FET cells arranged in the middle of the row of FET cells, respectively.

An active clamp photoelectric sensing device includes an input terminal, a first output terminal, a current-to-voltage conversion circuit, and an active clamp circuit. The input terminal receives an input current. The first output terminal outputs a first output voltage. The current-to-voltage conversion circuit is coupled between the input terminal and the first output terminal, and is used to discharge and lower potentials of the input terminal and the first output terminal to a first set voltage according to the state of a reset signal, or is used to gradually increase the first output voltage to a second set voltage. The active clamping circuit is coupled to the current-to-voltage conversion circuit, and is used to clamp the upper limit of the first output voltage to the second set voltage.

To provide a radio frequency power amplifier having a configuration of a sequential LMBA and capable of achieving broadband characteristics.SOLUTION: In a radio frequency power amplifier, an input signal distributer 40 distributes a first input signal RF1 at a radio frequency into two second input signals RF2a, RF2b, a peak amplifier 10 includes two first amplifiers 12A, 12B, output ends of the two first amplifiers being coupled to a first port P1 and a second port P2 of a hybrid coupler 30, respectively, and a carrier amplifier 20 includes two second amplifiers 22A, 22B and a combiner 23. The combiner combines radio frequency signals amplified by the respective two second amplifiers and outputs a combined radio frequency signal to a third port P3. The hybrid coupler combines radio frequency signals inputted to the first port and the second port and outputs a combined radio frequency signal from a fourth port, and varies a load impedance of the two first amplifiers of the peak amplifier, according to a current level of a radio frequency signal inputted to the third port from the carrier amplifier.SELECTED DRAWING: Figure 1

Disclosed herein is reducing equivalent series resistance (ESR) of a power management circuit during a single transmission. The power management circuit includes a plurality of power amplifier circuits each configured to amplify a signal for transmission. The power management circuit includes a main multi-stage charge pump (MCP), a first voltage modulation circuit, a light-weight MCP, and a second voltage modulation circuit. When only one of the power amplifiers is active to amplify a signal for a single transmission, the power management circuit will opportunistically couple the main MCP, the first voltage modulation circuit, the light-weight MCP, and the second voltage modulation circuit to the active power amplifier. Thus, the active power amplifier will see a reduced ESR collectively presented by the main MCP, the first voltage modulation circuit, the light-weight MCP, and the second voltage modulation circuit, and can therefore operate with improved efficiency during the single transmission.

In a high-frequency power control in which the output power of a high-frequency pulse output is made variable, the present invention reduces the lowering of power conversion efficiency due to an internal loss consumed inside the power supply of a high-frequency power supply device by selectively using a DC voltage control and a phase difference control depending on the output level range of an output level. The DC voltage control controls the output power by controlling a DC voltage supplied to an amplifier. The phase difference control controls the output power by controlling the phase differences φ between a plurality of control signals for controlling the amplifier. When the output level range is a high output level range, the output power is controlled by the DC voltage control, and when the output level range is a low output level range, the output power is controlled by the phase difference control.

Embodiments described herein relate to methods and apparatuses for performing digital predistortion, DPD, to provide a transmit signal, x̆(n) wherein the transmit signal, x̆(n), is for deriving one or more amplifier signals, x̆m(n), for driving one or more power amplifiers, wherein the one or more power amplifiers are associated with a respective one or more antenna elements. A method comprises: receiving a first signal, x(n); inputting the first signal, x(n), into a combination model, wherein the combination model comprises a machine learning, ML, model and a memory polynomial, MP, model; and outputting the transmit signal x̆(n), from the combination model.

This Doherty amplifier is configured comprising: a first output circuit (6) having a first transmission line for transmitting a first signal output from a carrier amplifier (4), and outputting the first signal after transmission by the first transmission line to a load (9); and a second output circuit (7) having a second transmission line for transmitting a second signal output from a peak amplifier (5), and outputting the second signal after transmission by the second transmission line to the load (9). The first transmission line is provided with: a first T-type circuit (11) having one end connected to the output side of the carrier amplifier (4) and having the load (9) and the other end connected thereto; and a first capacitor (12) having one end connected to the other end of the first T-type circuit (11) and the other end grounded. The second transmission line is provided with: a second T-type circuit (21) having one end connected to the output side of the peak amplifier (5); a second capacitor (22) having one end connected to the other end of the second T-type circuit (21) and having a load (9) and the other end connected thereto; and a third capacitor (23) having one end connected to the other end of the second T-type circuit (21) and the other end grounded.

It is desirable to increase the output power of an amplifier circuit.SOLUTION: A unit amplifier including a first transistor having a first control terminal to which a first input signal is input and configured to generate a first output signal, a second transistor having a second control terminal to which a second input signal is input and configured to generate a second output signal differential from the first output signal, a third transistor provided in parallel with the first transistor and configured to generate a third output signal differential from the first output signal, and a fourth transistor provided in parallel with the second transistor and configured to generate a fourth output signal differential from the second output signal, the first output signal and the fourth output signal are merged and output to a first output transmission line, and the second output signal and the third output signal are merged and output to a second output transmission line.SELECTED DRAWING: Figure 4

The four-frequency vehicle-mounted signal amplifier comprises a shell, a base and a circuit board, an inner cavity is formed in the shell, a placing block is integrally formed on the lower edge of the outer wall of the corresponding side of the shell, a plurality of inwards-concave mounting grooves are formed in the outer walls of the left side and the right side of the shell, and the mounting grooves are arranged in the inner cavity. A fixing mechanism is fixedly connected to the interior of the mounting groove, the circuit board is arranged in the inner cavity, the base comprises a bottom plate, and the two sides of the bottom plate are fixedly connected with a fixed side plate and movably connected with a movable side plate correspondingly; the outer walls of the corresponding sides of the fixed side plate and the movable side plate are fixedly connected with a plurality of limiting blocks matched with the fixing mechanism, and the fixed side plate and the movable side plate are fixedly connected with the shell through matching of the limiting blocks and the fixing mechanism. According to the utility model, the problems that the signal amplifier is fixedly connected or is fixedly connected through a bolt, and when an internal circuit board of the signal amplifier needs to be overhauled, the signal amplifier needs to be disassembled by adopting an adaptive screw, so that time and labor are wasted are solved.

A communication device includes a power amplifier that generates power signals according to one or more operating bands of communication data, with the amplitude being driven and generated in output stages of the power amplifier. The final stage can include an output passive network that suppresses suppress an amplitude modulation-to-phase modulation (AM-PM) distortion. During a back-off power mode a bias of a capacitive unit of the output power network component can be adjusted to minimize an overall capacitance variation. A output passive network can further generate a flat-phase response between dual resonances of operation.

The application discloses a double feedback branch current compensation type charge pump circuit, which comprises a core circuit, a double feedback branch and a bias circuit connected in sequence, wherein the input node of the double feedback branch is connected with the core circuit for detecting the potential change of the output voltage, the first output node of the first feedback branch in the double feedback branch is connected with the gate of the bias circuit, the second output node of the second feedback branch is connected with the bias circuit, and the up and down charging and discharging currents are carried out phased current compensation through the bias circuit according to the degree of the output voltage deviating from the center potential. The application solves the mismatching problem of the up and down charging and discharging currents when the output voltage deviates from the center potential through the double feedback branch, can convert the phase error output by the frequency discriminator into the difference between the charging and discharging currents, charges and discharges the loop filter to generate the control voltage of the voltage controlled oscillator, thereby realizing the lower charging and discharging current mismatching in the wider control voltage range, the smaller ripple on the output voltage, and the optimization of the jitter performance of the output clock of the phase-locked loop.

The application provides a precise output amplification circuit, a load detection circuit and a device applying the circuit. The output amplification circuit uses an operational amplifier and a rheostat to provide a precise large current for a load to be detected by using only a single precise output unit, saves detection channel resources, reduces test cost, and simultaneously uses two selectable fast voltage detection circuits and precise voltage detection circuits, applies Kelvin four-wire method and a controller to make the detection circuit have fast detection function and high-precision detection function, and realize switching of the detection module, and fully meet the needs of different test scenarios.

The embodiment of the present disclosure provides a variable gain amplifier with high temperature stability, which is applied to the technical field of electronic circuit. The amplifier comprises a constant transconductance bias circuit, a first variable gain amplifier and a second variable gain amplifier; wherein the output end of the constant transconductance bias circuit is connected with the input common source transistor of the first variable gain amplifier and the second variable gain amplifier, and is used for providing a constant transconductance bias signal which is compensated according to temperature change; the input end of the first variable gain amplifier is used for receiving an externally input differential signal, and the output end is connected with the input end of the second variable gain amplifier, and is used for transmitting the differential signal after coarse adjustment attenuation to the second variable gain amplifier; and the output end of the second variable gain amplifier is used for outputting an attenuation differential signal with temperature stability. In this way, by restraining the influence of temperature change on the transconductance characteristic of the input common source transistor of the variable gain amplifier, the stable attenuation characteristic of the variable gain amplifier in a wide temperature range is ensured.

A Doherty amplifier is provided that can generate individually adjustable control biases for a first stage amplifying element and a second stage amplifying element from a terminal voltage of a single bias terminal. The Doherty amplifier of the present disclosure includes a main amplifier and an auxiliary amplifier that are connected in parallel to an input terminal. The main amplifier and the auxiliary amplifier each have a driver amplifier and a final stage amplifier that is connected to the output of the driver amplifier. At least one of the driver amplifiers of the main amplifier and the auxiliary amplifier has a first stage amplifying element, a second stage amplifying element, a bias terminal that receives a bias to be supplied to a control electrode of the first stage amplifying element and a control electrode of the second stage amplifying element, respectively, a first resistor having one end connected to the control electrode of the first stage amplifying element and the other end connected to the bias terminal, a second resistor having one end connected to the control electrode of the second stage amplifying element and the other end connected to the bias terminal in parallel with the first resistor, and a constant current power supply that draws a current from a connection point between the second resistor and the control electrode of the second stage amplifying element.

The invention provides a low-noise amplifier and a chip wherein the low-noise amplifier comprises: a cascade amplification module, which comprises N cascade amplification units and amplifies and outputs an input signal under the action of each stage of bias signal, N being a natural number greater than 1; the active bias module is used for providing a corresponding bias signal for a first-stage amplification unit in the cascade amplification module; the control logic module takes the power supply voltage or the ground voltage as the output voltage based on the control signal; and the resistance voltage division module is connected with the control logic module and is used for carrying out resistance voltage division on the output voltage and providing corresponding bias signals for the second-stage amplification unit to the Nth-stage amplification unit in the cascade amplification module. According to the low noise amplifier and the chip provided by the invention, the problem that a traditional structure has a current abnormal phenomenon under a high-temperature condition is solved.

According to one embodiment, an electronic device comprises: a memory that stores instructions; a first power amplifier (PA) selectively connected to at least one of a plurality of modulators via a first switch; a first modulator of the plurality of modulators that includes a second switch connected between the first switch and a first capacitor, and a third switch connected to an output end of a first buck converter, and is configured to operate in an envelope tracking (ET) mode or an average power tracking (APT) mode; a second modulator of the plurality of modulators that includes a fourth switch connected between the first switch and a second capacitor, and a fifth switch connected to an output end of a second buck converter, and is configured to operate in an ET mode or an APT mode; and at least one processor that is operatively coupled to the first PA, the first modulator, and the second modulator, and comprises a processing circuit, wherein the instructions, when executed by the at least one processor, cause the electronic device to control the first modulator to operate in the APT mode on the basis of identifying a first event associated with network communication, control the first switch so as to couple the first PA to the first modulator and the second modulator, control the second switch, the third switch, and the fourth switch to be turned on, and control the fifth switch to be turned off on the basis of the first modulator operating in the APT mode.

Exemplary embodiments of the described technology provide a power supply system and method. The exemplary power supply system may include a load circuit comprising power electronics configured to apply DC power to a load. The power supply system may also include a power supply unit connected to drive the load circuit. The power supply unit may include a converter configured to convert input AC power to DC power. The power supply system may also include a controller. The controller may be configured to generate voltage and current control signals to be received as input by the load circuit. The voltage and current control signals may represent voltage and current values ​​to be applied to the load. The controller may also be configured to determine a voltage level to be supplied by the power supply unit to the load circuit. The controller may also be configured to generate a signal to be received by the power supply unit that represents a voltage level to be supplied by the power supply unit to the load circuit. The power supply system may include circuitry for measuring voltage with high accuracy.

The invention provides an analog amplifier circuit based on capacitance feedback, which relates to the technical field of signal processing, and comprises a positive voltage local voltage stabilization module, an amplifier module, a bias module and a negative voltage local voltage stabilization module, the positive voltage local voltage stabilization module, the bias module and the negative voltage local voltage stabilization module are all connected with the amplifier module; the positive voltage local voltage stabilization module is used for providing a first stable power supply for the amplifier module; the amplifier module is used for receiving a to-be-amplified signal input externally, performing signal amplification on the to-be-amplified signal to obtain an amplified signal, and outputting the amplified signal; the signal amplification is realized based on a transistor and a feedback capacitor in the amplifier module; the bias module is used for providing first bias voltage for the amplifier module; the negative voltage local voltage stabilization module is used for providing a second stable power supply for the amplifier module. The driving requirement and energy consumption of the amplifier are reduced by adopting capacitance feedback, the energy efficiency of the amplifier circuit is improved, signal amplification is realized through the transistor, and the amplifier circuit with a small area is realized.

The invention discloses an adjustable self-bias closed-loop ring amplifier which comprises a first-stage MOS tube, a second-stage MOS tube, a third-stage MOS tube and a bias resistor unit, each stage of MOS tube comprises two MOS tubes, grid electrodes of the two MOS tubes of the first-stage MOS tube are connected and then connected with an input node, an output of the first-stage MOS tube is connected with grid electrodes of the two MOS tubes of the second-stage MOS tube, and the bias resistor unit is connected with the first-stage MOS tube and the second-stage MOS tube. The bias resistor unit is connected between drain electrodes of two MOS tubes in the second-stage MOS tube, partial voltage of the bias resistor unit is used for generating a first bias voltage and a second bias voltage, the first bias voltage and the second bias voltage are respectively connected with grid electrodes of two MOS tubes of the third-stage MOS tube, and an output end of the third-stage MOS tube is used for outputting voltage to a rear-end circuit. The adjustable self-biased closed-loop ring amplifier can quickly amplify residual voltage, is suitable for high-speed occasions, can also realize higher gain, and can work in a sub-threshold value by biasing the MOS tube, so that the stability of the adjustable self-biased closed-loop ring amplifier is improved. The invention further discloses a switched capacitor circuit comprising the adjustable self-biased closed-loop ring amplifier.

To provide an amplifier circuit capable of miniaturization and widening bandwidth.SOLUTION: An amplification circuit includes: a first distributor for distributing an input signal to a first signal and a second signal; a first amplifier for amplifying the first signal; a second amplifier for amplifying the second signal; a combiner for combining the first signal and the second signal, and outputting the combined signal as an output signal; and a CRLH line, connected to at least either a first line connecting the first distributor and the first amplifier or a second line connecting the first distributor and the second amplifier, for adjusting a phase of at least the first signal flowing the first line or the second signal flowing the second line.SELECTED DRAWING: Figure 3

The embodiment of the present disclosure discloses a power amplifier circuit, a radio frequency chip and an electronic device. The power amplifier circuit comprises: at least two stages of power amplifiers in cascade; a low-frequency resonant network comprising a first capacitor, a second capacitor and a first inductor; the first capacitor is coupled between a power supply end and a ground end; the second capacitor is coupled between a first end of the power amplifier and the ground end; the first inductor is coupled between the first capacitor and the second capacitor; and the first capacitor comprises a decoupling capacitor.

A power amplifier circuit comprising a first carrier amplifier that includes a differential amplifier circuit which has a first transistor and a second transistor, and a first peak amplifier that is formed on the same semiconductor substrate as the first carrier amplifier, wherein: the emitter or source of the first transistor is electrically connected to the emitter or source of the second transistor; the emitter or source of the first transistor is electrically connected to a ground electrode via a first bump; and the emitter or source of the second transistor is electrically connected to the ground electrode via a second bump differing from the first bump.

The application relates to the field of wireless communication technology and provides a power amplifier and a radio frequency chip, which comprise input matching circuit, first-stage amplifier, first-stage inter-amplifier matching circuit, second-stage amplifier, second-stage inter-amplifier matching circuit, third-stage amplifier and output matching circuit which are electrically connected in sequence; the power amplifier further comprises a control module, a direct-current power supply module, a first bias circuit, a second bias circuit, a third bias circuit, a fourth bias circuit, a power amplification network and a switch control circuit; the switch control circuit comprises a diode, a first triode, a second triode, a first resistor and a second resistor; the positive electrode of the diode serves as the input end of the switch control circuit, and the negative electrode of the diode is connected with the collector of the second triode and serves as the output end of the switch control circuit; and the application can optimize the low-power consumption mode current and the gain of the power amplifier.