147 results about "Amplifier gain" patented technology

The invention relates to an ultrasonic flow metering device and a metering method thereof, and relates to the field of ultrasonic measuring devices. According to the metering device, through a cross-correlation operation circuit, a microcontroller, a double-threshold comparator, a peak detector, a gain adjustment circuit and a head wave threshold adjustment circuit, self-adaptive processing and adjustment of echo signals and head wave thresholds are achieved, and the accuracy and reliability of flow metering are improved. The metering method adopts an adaptive adjustment strategy of echo signal amplifier gain based on an output signal of an echo signal peak detection circuit, and a head wave threshold adaptive adjustment strategy based on a correlation operation value of echo signal sampling data and pre-stored reference wave data. According to the scheme, the stability of the echo signal and the rationality of the head wave threshold value are guaranteed, the method has adaptability to echo contour feature changes caused by transducer aging or contamination, and then the reliability of the flow metering process is guaranteed.

The invention discloses a low-power-consumption adaptive radio frequency circuit and an adjustment method thereof, the circuit comprises a power control module, a frequency adjustment module and an autonomous adaptive controller, and the power control module is electrically connected with the frequency adjustment module; the power control module is electrically connected with the autonomous adaptive controller, and the power control module is used for monitoring the intensity of an input signal in real time and dynamically adjusting the gain of the radio frequency amplifier; the frequency adjusting module is electrically connected with the autonomous self-adaptive controller, and the frequency adjusting module is used for adjusting the working frequency of the low-power-consumption self-adaptive radio frequency circuit; and the autonomous adaptive controller is used for monitoring real-time data of working environment frequency characteristics of the low-power-consumption adaptive radio frequency circuit and controlling the power control module and the frequency adjustment module based on a monitoring result. Through the mode, parameters can be automatically adjusted according to the real-time environment, the stability of the overall performance of the circuit is improved, and meanwhile power consumption is reduced.

The invention discloses a gain temperature compensation method and circuit for a Ku-band amplifier, and belongs to the technical field of semiconductor integrated circuits. A Ku wave band power amplifier is formed on the basis of a pHEMT amplification device. A grid temperature compensation bias network is adopted for grid bias of the pHEMT amplifier, and the gain of the amplifier is controlled to fluctuate along with the temperature. According to the fluctuation condition of the gain of the pHEMT amplifier along with the temperature, the resistance value of a temperature compensation resistor in the grid bias network is determined, and the grid bias voltage is divided through the grid temperature compensation resistor. As the resistance value of the thermistor changes along with the temperature, the direct-current voltage output by the grid bias network correspondingly changes along with the temperature, so that the gain is controlled. The problem that the gain of an existing PHEMT technology-based Ku band amplifier changes greatly along with the temperature change is solved, and the situation that the gain of the amplifier is out of tolerance along with the temperature change is avoided. The technical scheme provided by the invention is widely applied to various Ku wave band power amplifiers.

The invention relates to a tunnel reluctance current sensor structure and temperature parameter optimization method and system, and the method comprises the steps: arranging an annular magnetic core, forming symmetrically distributed air gaps in the annular magnetic core, placing a tunnel reluctance current sensor in each air gap, and forming a double-air-gap magnetic circuit structure; constructing a magnetic field consistency coefficient according to the average magnetic induction intensity, the minimum magnetic induction intensity and the maximum magnetic induction intensity of the air gap center area, and performing optimization solution on structural parameters of the double-air-gap magnetic circuit structure by taking minimization of the magnetic field consistency coefficient as a target; respectively establishing a measurement channel and a reference channel according to the double-air-gap magnetic circuit structure obtained through optimization solution; multiple times of voltage signal acquisition are carried out through a reference channel under different injection reference currents and different temperature environments, and a temperature compensation factor is calculated, so that gain parameters of an amplifier in a measurement channel are adjusted. Compared with the prior art, the anti-interference capability and the measurement sensitivity of the system can be greatly improved.

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 discloses a high-precision integrated temperature sensor circuit and application, and relates to the technical field of integrated circuits, and the high-precision integrated temperature sensor circuit comprises a band-gap reference circuit, a buffer circuit, an analog-to-digital conversion circuit, a two-phase non-overlapping clock generation circuit and an FIR (Finite Impulse Response) digital filter. It needs to be explained that a key circuit sigma-delta modulator adopts an integrator cascade feed-forward structure CIFF, compared with a CIFB with a feedback structure, an STF function of an ADC of a feed-forward structure is close to 1, a peak value can appear only at a high frequency, only a very small error signal can pass through a whole loop, and therefore the stability of the analog-to-digital converter is greatly improved. Therefore, the gain of the amplifier in the first-stage integrator can be made relatively large, and noise and nonlinearity generated by the rear-stage integrator are effectively suppressed. Moreover, each stage of integrator does not process a feedback signal with high-frequency noise, so that the bandwidth requirement on the next stage of operational amplifier is reduced, the power consumption required by the CIFF structure is lower, and meanwhile, the output swing has better stability due to no feedback structure.

Systems and techniques are provided for power amplifier gain error compensation for a Digital Power Amplifier (DPA). In some aspects, a compensation method includes obtaining in-phase (I) and quadrature-phase (Q) components of a baseband sample corresponding to in-phase input amplitude codes and quadrature-phase input amplitude codes. The in-phase input amplitude codes can be distorted based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the I component. The quadrature-phase input amplitude codes can be distorted based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the Q component. The DPA can be driven using the pre-distorted output amplitude codes of the I and Q components to generate a Radio Frequency (RF) output.

The invention belongs to the technical field of integrated circuits, and particularly relates to a radio frequency amplifier bandwidth expansion circuit based on resistor-capacitor series feedback. The bandwidth expansion circuit comprises a first-stage common-gate amplifier, a second-stage common-source amplifier, a transformer-based inter-stage matching network between the two stages of amplifiers, and two resistor-capacitor series feedback paths, and a resistor-capacitor series feedback path is bridged at two sides of the interstage matching network, and feedback is introduced from the output end of the common source amplifier to the output end of the common gate amplifier, so that the quality factors of two resonant cavities of the interstage matching transformer are adjusted, and the targets of adjusting the gain of the amplifier and expanding the bandwidth of the radio frequency amplifier are further realized.

Amplifiers with new circuit topologies for gain shaping and gain control are described herein. An example amplifier circuit with gain control includes a differential transistor pair, a main transistor pair coupled to the differential transistor pair, an auxiliary transistor pair coupled to the differential transistor pair, and a resistive impedance coupled between base terminals of the auxiliary transistor pair. The resistive impedance can include a pair of matched resistors coupled between base terminals of the auxiliary transistor pair. The amplifier can also include a capacitor coupled from a virtual ground node between the pair of matched resistors to ground. The amplifier circuits described herein can present a preferred gain response as compared to other amplifiers, at both midband and peaking frequencies. The amplifier circuits also offer additional options for control of gain at midband frequencies, among other benefits.

The invention relates to the technical field of integrated circuits, in particular to a residual amplifier gain insensitive assembly line analog-to-digital conversion chip which comprises a successive approximation analog-to-digital converter and a double-residual analog-to-digital converter module which are connected through a residual amplifier. The successive approximation analog-to-digital converter comprises a sampling switch and a capacitor array; the capacitor array adopts a structure of combining a binary capacitor array and an additional capacitor array; the double-residual analog-to-digital converter module comprises a plurality of double-residual analog-to-digital converters; the double-residual analog-to-digital converter is a residual self-generating double-residual analog-to-digital converter; the number of the double-residual analog-to-digital converters is N, and N is a positive integer greater than or equal to 2; the successive approximation analog-to-digital converter and each double-residual analog-to-digital converter are connected with the logic control unit. The assembly line analog-to-digital conversion chip with insensitive residual amplifier gain, provided by the invention, can be independently used as a sub-ADC in a multi-stage Pipeline ADC, and does not depend on a preceding stage sub-ADC.

The embodiment of the invention provides a gain regulation and control precision maintenance method for a programmable Raman amplifier. The method comprises the following steps: acquiring basic scene sample data and target scene sample data to form a source domain sample data set and a target domain sample data set; selecting a proper machine learning method as a basic learning algorithm according to the characteristics of the data in the data set; initializing weights occupied by a source domain sample and a target domain sample; fitting a prediction model by adopting a basic learning algorithm according to the weights of the source domain sample and the target domain sample; re-weighting the source domain sample and the target domain sample according to the total weighting error of the target domain sample so as to correct the difference between the distribution of the source domain sample and the distribution of the target domain sample; and obtaining a model after multiple iterations as a pumping prediction model of the programmable Raman amplifier. When the use scene of the programmable Raman amplifier changes and the accuracy of the regulation and control algorithm of the programmable Raman amplifier is reduced, by means of the method, maintenance of the gain regulation and control precision of the programmable Raman amplifier can be achieved by collecting a small amount of sample data, and the use scene of the programmable Raman amplifier is effectively expanded.

The invention relates to the technical field of wireless communication, and provides a radio frequency power amplifier which comprises a power amplifying circuit, a first biasing circuit, a second biasing circuit and a feedback circuit. The first biasing circuit comprises a first resistor, a first voltage division circuit and a first triode, the first end of the first resistor is used for being connected to an external first power supply, and the second end of the first resistor is connected with the first end of the first voltage division circuit and the base electrode of the first triode; the second biasing circuit comprises a second resistor, a second voltage division circuit and a second triode; the first end of the second resistor is connected with the second end of the first resistor, the second end of the second resistor is connected with the second voltage division circuit and the second triode, and the second triode is connected with the feedback circuit and the power amplification circuit. According to the radio frequency power amplifier, power amplifier gain and linear performance fluctuation caused by temperature change can be reduced, and simplified circuit layout and smaller chip area occupation can be realized.

The embodiment of the invention discloses a transient response simulation method and device of a power amplifier, equipment and a storage medium. According to the method, the temperature value of each stage of tube core of the power amplifier in a thermal stable state is determined, a preset variable is defined in a simulation environment, the variable quantity of the temperature value generated along with time in the working process of the power amplifier is simulated through the preset variable, and the preset variable is scanned; generating a curve of the gain value of the power amplifier changing along with the preset variable, calculating the slope of the curve, and adjusting the parameter information in the simulation circuit according to the slope. According to the transient simulation method, the junction temperature change of the power amplifier generated along with the change of the working time is utilized to influence the gain change characteristic of the power amplifier, and the time change is simulated through the temperature change, so that the problems of non-convergence and low simulation speed caused by time scanning in the existing transient simulation scheme are solved; the accuracy of transient response simulation of the power amplifier is effectively improved, and the simulation time is shortened.

The invention relates to a reset circuit of a charge sensitive preamplifier. The circuit comprises a trigger signal generation module, a control signal generation module and a reset module, the trigger signal generation module is used for generating a reset trigger signal when the output voltage of the charge sensitive pre-amplifier is increased to the upper threshold voltage or reduced to the lower threshold voltage; the control signal generation module is used for generating a reset control signal according to the reset trigger signal; the reset module is used for generating a reset charge signal in response to the reset control signal and inputting the reset charge signal to the input end of the charge sensitive preamplifier, so that the output voltage is reset to a preset voltage; the reset circuit does not change the working state of the charge sensitive pre-amplifier in the reset process, the problems of gain abrupt change and unstable working state of the amplifier in the reset process are avoided, structures such as a feedback resistor which additionally generates leakage current and noise do not need to be used in the circuit, and the noise performance cannot be deteriorated.

The invention relates to the technical field of electronic circuits, and discloses a coil current feedback control system and method, and the system comprises a signal generator and a power amplifier which are used for supplying power to a target coil; the current acquisition sensor is used for acquiring the real-time current of the target coil; and the processing module is used for comparing the real-time current with a target current of the target coil, and sending a control instruction to the power amplifier when the real-time current is not equal to the target current, so as to adjust the gain of the power amplifier and adjust the real-time current of the target coil to the target current. According to the invention, through real-time measurement and feedback control of the coil current, automatic adjustment of the gain of the power amplifier is realized, and accurate control of the coil current is further realized.

The invention discloses a double-sideband resonance optical fiber amplifier and an in-band ASE suppression method. The optical fiber amplifier comprises a narrow-linewidth seed light source, a narrow-linewidth laser pre-amplification system, a main amplification system, a seventh single-mode optical fiber, a mode field adapter, a first large-mode-field optical fiber, a laser collimating lens and a transmission type diffraction grating. Final pre-amplified signal light output in the narrow linewidth laser pre-amplification system passes through an FBG of a first LWS resonant cavity, an FBG of a second LWS resonant cavity, an FBG of a first SWS resonant cavity and an FBG of a second SWS resonant cavity in the main amplification system, long-wave sideband laser and short-wave sideband laser are obtained respectively, a gain optical fiber of the main amplifier absorbs pump light, and the pump light is transmitted to the main amplification system. The pump light and the sideband laser are processed by the laser output end cap to obtain divergent laser beams; amplified signal laser is obtained through processing of the laser collimating lens and the transmission-type diffraction grating. According to the invention, the influence on signal laser gain is reduced to the greatest extent, and the method can be applied to a main amplification stage with higher power.

Systems and techniques are provided for power amplifier gain error compensation for a Digital Power Amplifier (DPA). In some aspects, a compensation method includes obtaining in-phase (I) and quadrature-phase (Q) components of a baseband sample corresponding to in-phase input amplitude codes and quadrature-phase input amplitude codes. The in-phase input amplitude codes can be distorted based on first gain pre-compensation information corresponding to an in-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the I component. The quadrature-phase input amplitude codes can be distorted based on second gain pre-compensation information corresponding to a quadrature-phase signal branch of the DPA, to generate pre-distorted output amplitude codes of the Q component. The DPA can be driven using the pre-distorted output amplitude codes of the I and Q components to generate a Radio Frequency (RF) output.

The application belongs to the technical field of radio frequency amplifiers, and specifically discloses a CMOS common-source common-gate radio frequency amplifier with temperature and process deviation compensation, which comprises a bias circuit and an amplification stage circuit; the bias circuit adopts a temperature and process deviation compensation bias circuit; when the ambient temperature changes, the bias circuit can collect the real-time temperature of an amplifying tube and generate a new bias voltage, so that the bias state of the amplification stage circuit is dynamically adjusted, and the fluctuation of the gain and power consumption of the amplifier with the temperature change is reduced; similarly, when the process parameter distribution deviation occurs in different regions of a wafer during the chip manufacturing process, the same chip bias circuit and the amplifying tube region of the amplification stage circuit are the same, the same process deviation is generated, the bias circuit can generate a new bias voltage according to the process deviation, the bias state of the amplification stage circuit is dynamically adjusted, and the fluctuation of the gain and power consumption of the amplifier with the process deviation is reduced. The application is suitable for a low-noise amplifier in a WiFi radio frequency front-end module.

This invention belongs to the field of magnetic material measurement technology, and particularly relates to a power amplifier gain control method and system for magnetic characteristic measurement. The method includes the following steps: calculating the instantaneous rate of change of magnetization impedance at each moment, where the instantaneous rate of change of magnetization impedance is positively correlated with the time derivative of the ratio of output voltage to excitation current; calculating the dynamic load margin at each moment, where the dynamic load margin is negatively correlated with the instantaneous rate of change of magnetization impedance and positively correlated with the difference between the power amplifier's supply rail voltage and output voltage amplitude; determining the gain scaling factor at each moment, where the gain scaling factor is positively correlated with the dynamic load margin and its value ranges between a set upper and lower gain limit; and using the gain scaling factor to adjust the drive voltage command in real time to control the power amplifier's output gain, which can effectively improve the accuracy of power amplifier gain control for magnetic characteristic measurement.

The present application proposes a current mirror type gain bootstrap operational transconductance amplifier, comprising: an input circuit receiving a differential input and providing an input transconductance; the current mirror circuit is used for amplifying the gain of the amplifier according to the mirror image proportion; the cascode gain bootstrap circuit is used for improving the output resistance of the current source mirror circuit, so that the gain of the amplifier is further expanded; and the tail current source is connected with the input circuit to provide stable reference current. The amplifier gain can be effectively improved, and the amplifier can be applied to various operational amplifier scenes.

The invention discloses a high-precision multi-band power amplifier gain amplitude-phase calibration device and method based on FPGA control, and the device comprises a numerical control attenuator, a plurality of different segmented phase shifters, a radio frequency multi-way switch, a digital temperature sensing unit, an air cooling system, a power circuit, an FPGA chip, and an upper computer. The numerical control attenuator, the radio frequency multi-way switch and the sectional type phase shifter form a radio frequency calibration link, the numerical control attenuator, the sectional type phase shifter, the radio frequency multi-way switch, the digital temperature sensing unit and the air cooling system are respectively in signal connection with a control output port of the FPGA chip, and the FPGA chip is connected with an upper computer through an RS232 serial port communication circuit. The power supply circuit provides power supply requirements for all the modules, the calibrated power amplifier is connected with the output end of the sectional phase shifter, and the digital temperature sensing unit is attached to the packaging surface of the calibrated power amplifier. According to the invention, the amplitude and phase fluctuation of the power amplifier can be finely controlled within a required range while the signal integrity is ensured, and the problems of low calibration efficiency, low calibration precision and high calibration cost of a traditional calibration device are solved.