842results about "Amplifier combinations" patented technology

A logarithmic amplifier system is disclosed. The system includes first and second amplifiers respectively having first and second gains; a first multiplier having an input connected to an output of the first amplifier, and being configured to output a first multiplied signal based on an output signal of the first amplifier and based on a received first multiplication factor equal to a value K; a second multiplier having an input connected to an output of the second amplifier, and being configured to output a second multiplied signal based on an output signal of the second amplifier and based on a received second multiplication factor equal to 1 minus the value K; a transition shaping circuit configured to change the value K from 0 to 1 with a filtered transfer function; and a summing circuit having inputs coupled to outputs of the first multiplier and the second multiplier.

The invention discloses a parallel constant-voltage digital audio power amplifier and a broadcasting system. Comprising a line input module, a line output module, a first analog-to-digital conversion circuit, a second analog-to-digital conversion circuit, a third analog-to-digital conversion circuit, a digital signal processor, a single-chip microcomputer, a digital-to-analog conversion circuit, an error comparator, a modulator, an integrating circuit, a pulse width modulation input half-bridge output stage, and a first carrier frequency selection and gain adjustment module. A second carrier frequency selection and gain adjustment module, a first LC filter, a high-frequency compensation network, a communication bus and a power switch. The technical problems that an existing multi-channel parallel digital constant-voltage power amplifier is only limited to power amplifier channels in the same power amplifier, the parallel connection mode only uses the first channel as a main power amplifier and only uses the other channels as slave power amplifiers, and certain limitation exists are solved.

Aspects of this disclosure relate to a power amplifier system with symbol-based envelope tracking and fault protection. The system can include a power amplifier and a voltage modulator. The voltage modulator can include switches configured to provide the bias voltage and to provide electric circuit breaker protection. The voltage modulator can include a fault detection circuit that can cause a switch of the switches to provide electric circuit breaker protection in response to detecting a circuit fault. Related methods and voltage modulators are disclosed.

Implementations of disclosed systems and methods are capable of changing the frequency or other waveform characteristics dynamically based on receiving feedback about the effect of an electromagnetic pulse radiation on a target electronic device. Various implementations can be configured to emit electromagnetic pulses at a single radio frequency or a plurality of radio frequencies. For example, the frequency of the carrier electromagnetic radiation in a single pulse can change during the pulse interval. As another example, a single electromagnetic pulse can comprise a frequency comb with two or more frequencies.

The invention relates to the technical field of weak signal conditioning circuits, and discloses a multi-light-source spurious noise suppression circuit based on a laser sensor and a signal conditioning method, and the circuit comprises a photoelectric conversion module which is used for converting a received optical signal into a current signal; the transimpedance conversion module is connected with the photoelectric conversion module, converts the current signal into a first voltage signal and suppresses common-mode noise; the first-stage amplification module is used for carrying out linear amplification on the first voltage signal and outputting a second voltage signal; the programmable filtering module is used for carrying out high-frequency noise suppression on the second voltage signal; the reverse phase adjusting module is used for adjusting the phase and the amplitude of the filtered signal so as to adapt to a post-stage load; and the feedback control module analyzes the frequency spectrum of the output signal in real time and dynamically adjusts the cut-off frequency of the programmable filtering module. The invention aims to solve the problems that in the prior art, a laser sensor circuit is poor in anti-interference performance in a multi-light-source environment, and measurement is inaccurate due to spurious noise.

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.

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.

The embodiment of the invention provides a signal processing circuit and an integrated circuit. The signal processing circuit includes: a first amplification branch including a first operational amplifier and a first resistance network connected to the first operational amplifier; a detection branch coupled to an input of the first amplification branch, the detection branch comprising a variable resistor and configured to detect a common mode component input to the first amplification branch and generate a compensation signal based on the common mode component and a resistance value of the variable resistor; and an adjustment branch coupled between the detection branch and the first amplification branch and configured to adjust the compensation signal and apply the adjusted signal to the first amplification branch to reduce an input deviation of the first operational amplifier, the input deviation being associated with a resistance mismatch and a common mode component of the first resistance network.

Aspects of this disclosure relate to voltage modulators with staged activation of switches. A voltage modulator can receive supply voltages and provide a selected one of the supply voltages as an output voltage. The voltage modulator can include switches in parallel where one of the switches in parallel activates before another switch in parallel in association by transitioning the output voltage between different supply voltages. Embodiments of this disclosure relate to symbol-based envelope tracking. Related systems and methods are disclosed.

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.

A radio frequency circuit includes a first radio frequency circuit, a second radio frequency circuit, and a first switch circuit. The first switch circuit includes a first terminal connected to an antenna connection terminal, a second terminal connected to the first radio frequency circuit, and a third terminal connected to the second radio frequency circuit. The first radio frequency circuit includes a first power amplifier circuit supporting a first power class, and a first filter circuit connected to the first power amplifier circuit and having a passband that includes a first band. The second radio frequency circuit includes a second power amplifier circuit supporting a second power class having a maximum output power greater than a maximum output power of the first power class. The second radio frequency circuit includes a second filter circuit connected to the second power amplifier circuit and having a passband that includes the first band.

The invention relates to the technical field of radio frequency, and discloses a differential phase self-calibration single-power-supply variable gain distributed balun circuit which comprises a differential phase calibration module, an ultra-wideband matching gain adjustment module and a distributed balun amplifier core module connected with the differential phase calibration module and the ultra-wideband matching gain adjustment module. On the basis of a traditional differential-to-single-ended distributed balun circuit, the defect that a traditional distributed balun needs multiple sets of power voltages is overcome by only needing one set of power voltages, and meanwhile, the distributed balun circuit provided by the invention also has a digital gain calibration function, so that the balun has a higher degree of freedom in use. In addition, a differential signal self-calibration circuit is further used, and it is guaranteed that the phase error of balun differential input is minimized.

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.

The embodiment of the invention discloses a power amplifier circuit, a radio frequency chip and electronic equipment. The power amplifier circuit comprises at least two stages of cascaded power amplifiers, the low-frequency resonance network comprises a first capacitor, a second capacitor and a first inductor; the first capacitor is coupled between a power supply end and a grounding end; the second capacitor is coupled between the first end of the power amplifier and the grounding end; the first inductor is coupled between the first capacitor and the second capacitor; the first capacitor comprises a decoupling capacitor.

The invention relates to the technical field of guide rail meter testing, in particular to a proportional operational amplifier circuit for simulating Rogowski coil signal output and a testing device, which comprises a current sampling loop for converting input current into voltage analog signal output, and a proportional amplification loop connected with the output end of the current sampling loop, and the analog module is used for amplifying an input voltage analog signal by an amplification coefficient K and then outputting the amplified voltage analog signal, and the amplification coefficient K is matched with the sensitivity coefficient S of the Rogowski coil to be simulated. Through the collaborative design of the high-precision current transformer and the proportional operational amplifier circuit, the primary side test current is reduced to below 50A, and meanwhile, a voltage signal which is equal to a Rogowski coil in proportion is accurately generated through the proportional operational amplifier circuit. According to the design scheme, the final test effect can be achieved by applying the current of 0.04-50A, the test environment is safer compared with the test environment with the large current of 500A, and the service life of the test bench body is protected.

The utility model provides a precise resistive sensor temperature measurement circuit and device, and relates to the technical field of temperature measurement circuits, through setting a proportional amplifier, ADC voltage at an output end of the proportional amplifier is only associated with a matching resistor (fixed resistance value) of a resistive temperature measurement sensor and a feedback resistor arranged in the proportional amplifier, so that the temperature measurement precision is improved. Therefore, the resistance value of the resistive temperature measurement sensor can be reversely calculated according to the collected ADC voltage, and the temperature of the current test point can be reflected according to the resistance value comparison table, which is irrelevant to the resistance value of the cable, so that the problem of inaccurate accuracy caused by long distance of the test temperature point is solved.

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.