46 results about "Linear circuit" patented technology

A method is performed at least partially by a processor and includes, based on design specifications of a voltage regulator, determining parameters of the voltage regulator. The method further includes, based on the parameters of the voltage regulator, determining model parameters of a voltage regulator (VR) model of the voltage regulator. The VR model is free of non-linear circuit components. The method further includes performing a simulation of the voltage regulator, using the model parameters of the VR model.

A simulation system and method for implementing a model based on an iterative neural network, the system comprising: a simulation vector-matrix multiplication circuit that encodes a weight matrix of the model based on the iterative neural network; and an analog non-linear circuit that encodes a non-linear function arranged in a feedback loop configured to return an output signal from the non-linear circuit as input to the vector-matrix multiplication circuit, wherein the system is configured to output a solution vector of values of the model based on the iterative neural network upon convergence of the system.

The invention provides a computer readable storage medium, an estimation method, and an estimation apparatus. A computer-readable storage medium causes a computer to function as: an acquisition unit (22) that acquires first information pertaining to a linear circuit having a plurality of ports for inputting or outputting a high-frequency signal and second information pertaining to the frequency of the high-frequency signal; an estimation unit (24) estimates an S parameter for two ports among the plurality of ports at the frequency on the basis of a learned model on the basis of the first information and the second information, and a restriction unit (26) restricts the S parameter within a range when the second information indicates that the frequency is 0 Hz and the estimated S parameter is outside the range.

The present invention discloses a method and device for sequence impedance modeling of a network-forming converter, belonging to the technical field of power system control. The method includes: adding voltage disturbances to the AC port and DC port in the equivalent two-port network of the network-forming converter to be analyzed and modeled; performing frequency coupling analysis on the non-linear circuit under the current response of the voltage disturbance to model the initial transfer function of the sequence impedance model corresponding to each frequency coupling component, fully considering the interaction between network-forming converters, revealing the frequency coupling law of the converter, and improving the accuracy of the sequence impedance model; using the control equation of the network-forming control loop model corresponding to the control loop sequence impedance to remove the zero-sequence component in the circuit equation of the non-linear circuit to obtain a modified sequence impedance circuit equation, which can reduce the complexity of modeling calculation; using the modified sequence impedance circuit equation to modify the initial transfer function of each sequence impedance model to accurately perform linearized modeling of the sequence impedance of the network-forming converter.

An AC current of multiple frequencies is setup in a body to be sensed, and amplitudes and phases of AC voltages at many electrodes attached to the body are detected simultaneously. At electrode measurement circuits, each of multiple modulating signals is mixed separately with the electrode signal using non-linear circuit components such as transistors or diodes. The output of this mixed signal is stored as a charge, in a capacitor or a semiconductor device (e.g. a CMOS transistor) that can store charge when in a certain state. Upon assertion of a readout signal, the charge is converted back into voltage and sent out on an analog voltage output line from which it is read using ADCs.

The present invention relates to a data-driven state feedback control method and device for a periodic piecewise linear circuit system. The method comprises: constructing a periodic piecewise linear closed-loop system model to obtain basic system information; performing input-output experiments on each subinterval to obtain input-output data that satisfies a response rank condition; describing the system dynamics of the linear system on the subinterval based on the input-output data with sufficient excitation, and obtaining the closed-loop characteristics of the system represented by the input-output data; constructing a Lyapunov function of the closed-loop periodic piecewise linear system, and using the Schur complement equivalence to construct the stability condition of the linear matrix inequality for the Lyapunov function; substituting the obtained input-output data into the stability condition to solve the controller gain matrix; and substituting the controller gain matrix back into the closed-loop system model to converge the state variables to an equilibrium point. The present invention adopts a data-driven approach to achieve effective control under unknown system parameters and achieve fast and flexible convergence.

The embodiment of the invention provides an integrated circuit design system and method and a computer program product. The method is performed at least in part by a processor and includes determining a parameter of the voltage regulator based on a design specification of the voltage regulator. The method further includes determining model parameters of a voltage regulator (VR) model of the voltage regulator based on the parameters of the voltage regulator. The VR model does not contain a non-linear circuit assembly. The method further includes simulating the voltage regulator using the model parameters of the VR model.

In one example, a receiver includes: a front end circuit to convert a radio frequency (RF) input signal into at least one frequency signal; a non-linear circuit coupled to the front end circuit, the non-linear circuit to generate at least one shaped frequency signal from the at least one frequency signal according to at least one non-linear transfer function; and a modulation signal detector coupled to the non-linear circuit to output a likelihood signal based on the at least one shaped frequency signal.

To provide a nonlinear compensation device, a nonlinear compensation method, and a program for appropriately updating a parameter even when a reference signal cannot be used every time.SOLUTION: A nonlinear compensation device 200 includes a plurality of nonlinear circuits 201 - 1 to 201 - N that output signals obtained by adding nonlinear characteristics to reception signals transmitted by a transmitter and received by a receiver, a linear circuit 202 that outputs a sum of values obtained by multiplying outputs of the plurality of nonlinear circuits by weighting coefficients as a compensation signal, and a first learning unit 204 that sets at least one of parameters of the nonlinear characteristics of the plurality of nonlinear circuits and the weighting coefficients of the linear circuit on the basis of an error between the compensation signal and a reference signal. And a second learning unit 203 that changes each weight coefficient of the linear circuit 202.SELECTED DRAWING: Figure 3

The invention relates to a low-ripple bipolar constant-current power supply applied to a particle accelerator. The low-ripple bipolar constant-current power supply comprises a direct-current voltage input unit, a Buck circuit unit, a microprocessor, an adjustable linear circuit unit, a bipolar control circuit unit, a voltage and current sampling circuit unit and a bipolar current output unit which are connected in sequence. The low-ripple bipolar constant-current power supply device manufactured by adopting the technology has the advantages of small volume, low output ripple, good stability and strong anti-interference capability, the long-term operation stability can reach within 100ppm, and the low-ripple bipolar constant-current power supply device has a bipolar output function and can output positive current and negative current.

A non-transitory computer-readable recording medium having stored therein a program causes a computer to execute a process. The process includes acquiring first information related to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information related to a frequency of the high frequency signal, estimating, when the second information indicates that the frequency is 0 Hz, an S-parameter for two ports of the plurality of ports when the frequency is 0 Hz, from the first information based on a first learned model, and estimating, when the second information indicates that the frequency is other than 0 Hz, an S-parameter at the frequency from the first information and the second information, based on a second learned model. The first and the second learned models are generated by performing machine learning on plural pieces of first training data and second training data, respectively.

The application provides a self-powered circuit of a switching power supply and the switching power supply. The self-powered circuit comprises a first linear voltage stabilizing circuit connected between a common connection end of a main power tube and an auxiliary power tube and a power supply capacitor; a second linear voltage stabilizing circuit connected in parallel with the second linear voltage stabilizing circuit; and an adjusting circuit connected with the second linear voltage stabilizing circuit, which generates an adjusting voltage to adjust a first charging current flowing through the second linear voltage stabilizing circuit when the second linear voltage stabilizing circuit is turned on. When the switching power supply is started, the first linear voltage stabilizing circuit is turned on, and the power supply capacitor is charged. When a PWM signal generated by a control chip of the switching power supply is valid, the second linear voltage stabilizing circuit is turned on. The application can save power supply loss and optimize system EMI.

Disclosed are a continuous-time delta-sigma analog-to-digital converter and an operation method thereof. More particularly, a continuous-time delta-sigma analog-to-digital converter, including: a linear integrator configured to generate a first output signal corresponding to a preset input voltage based on an operation of a linear Gm circuit that receives the preset input voltage; and a quantizer configured to generate a second output signal corresponding to the first output signal based on an operation of a body-driven VCO that receives the first output signal and to generate a digital output code corresponding to the second output signal based on an operation of a Frequency to Digital Converter (FDC) that receives the second output signal is disclosed.

The invention discloses a model order reduction method and system for a multi-port linear circuit, a terminal and a computer readable storage medium, and the method comprises the steps: obtaining a to-be-reduced-order circuit model, carrying out the port number reduction of the to-be-reduced-order circuit model according to a port reduction strategy, and obtaining a target circuit model; a target mapping equation is constructed based on the target circuit model, a residual module and a tensor mapping structure, the tensor mapping structure is used for representing the correlation between the circuit model to be subjected to order reduction and the target circuit model, and the residual module is used for predicting corresponding output according to the input; generating a training data set according to the to-be-reduced-order circuit model, and training a residual module and a tensor mapping structure in the target mapping equation to obtain a trained target mapping equation; and generating an order reduction result according to the target circuit model and the trained target mapping equation. According to the method, the trained target mapping equation can be adopted on the basis of the target circuit model, so that the precision of the multi-port model after order reduction can be improved.

To provide a program, a method, and a trained model for improving the accuracy of an S-parameter of a high frequency circuit.SOLUTION: An estimation apparatus 20 functions as: an acquisition unit 22 which acquires first information pertaining to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information pertaining to a frequency of the high frequency signal; a first estimation unit 24 which estimates, when the second information indicates that the frequency is 0 Hz, an S-parameter for two ports of the plurality of ports when the frequency is 0 Hz, from the first information based on a first trained model; and a second estimation unit 26 which estimates, when the second information indicates that the frequency is other than 0 Hz, an S-parameter at the frequency from the first information and the second information, based on a second trained model.SELECTED DRAWING: Figure 8

A non-transitory computer-readable recording medium having stored therein a program causes a computer to execute a process. The process includes acquiring first information related to a linear circuit having a plurality of ports for receiving or outputting a high frequency signal, and second information related to a frequency of the high frequency signal, estimating an S-parameter for two ports of the plurality of ports at the frequency, based on a learned model, and when the second information indicates that the frequency is 0 Hz and the estimated S-parameter is out of a range, restricting the S-parameter to be within the range. The learned model is generated by performing machine learning on a plurality of pieces of training data. The plurality of pieces of training data defines a relationship among a plurality of pieces of first information of the linear circuit, a plurality of frequencies, and a plurality of S-parameters.

The present invention discloses an NLADRC voltage control method for an efficient power converter for electric vehicles, which relates to the technical field of NLADRC voltage control for efficient power converters for electric vehicles, and includes establishing an equivalent model of a CLLLC resonant converter based on the fundamental wave analysis method; solving the voltage gain by using a linear circuit solution method through the FHA equivalent model of the CLLLC resonant converter; and establishing an improved anti-integral saturation NLADRC voltage control strategy. The method of the present invention significantly improves the anti-disturbance ability and stability by applying an improved non-linear auto-disturbance rejection control strategy with anti-integral saturation. By using a non-linear filtering function, this strategy effectively suppresses the fluctuations in the response, accelerates the stabilization speed, and improves the overall control stability and robustness.

The utility model discloses a linear circuit board surface coating device which comprises a support, a PVC conveying belt and a roller conveying belt are arranged above the support, the PVC conveying belt is located on the left side of the roller conveying belt, a top frame is arranged above the right side of the support, and a coating machine nozzle is installed at the top of the top frame; the roller conveying belt comprises a fixed roller and a movable roller, the movable roller is arranged in the middle of the fixed roller, a spring is connected to the outer side of the movable roller, and an extrusion column is connected to the outer side of the middle of the movable roller; and the spraying machine body is arranged on the rear side of the middle of the support, and the spraying machine body is electrically connected with the pressure switch. According to the linear circuit board surface coating device, a circuit board can be linearly conveyed and coated, assembly line is facilitated, spraying machine nozzles are arranged on the top frame at equal intervals, comprehensive spraying of the circuit board is facilitated, and the spraying time is saved.

According to the double-bus GIS system, the arrangement structure of the buses in the GIS system in a double-bus arrangement mode in the prior art is changed, the linear disconnecting switches and the linear circuit breakers are adopted, the linear circuit breakers are arranged in the transverse direction, wiring ports of the linear circuit breakers are formed in the planes of the two ends, and the linear circuit breakers are arranged on the planes of the two ends. One end of the linear circuit breaker is connected with a main bus through linear disconnecting switches, the other end of the linear circuit breaker is provided with a T-shaped adapter, two adapter ports which are oppositely arranged are arranged in the longitudinal direction, the linear disconnecting switches are installed on the two adapter ports, and the end adapters are installed on the two linear disconnecting switches. The branch bus passes through the end part adapter and is arranged along the transverse direction, connection structures of all elements in the GIS are vertically arranged, and if a basin-type insulator needs to be installed, the basin-type insulator is also vertically arranged, so that transverse arrangement of the basin-type insulator is avoided, and potential safety hazards caused by dust deposition and discharge of the basin-type insulator are reduced.

A device includes an adaptive power limitation circuit configured to automatically determine active phases of a DCDC converter based upon power level of the DCDC converter. The adaptive power limitation circuit includes a translinear circuit configured to convert the power level of the DCDC converter to a current level and a clamping circuit, operatively connected to the translinear circuit, configured to clamp a maximum output current of the adaptive power limitation circuit to a predetermined value.

To solve a problem with a nonlinear circuit in which the output power decreases when the frequency band of the generated signal becomes high.SOLUTION: In a nonlinear circuit having a nonlinear element portion, the nonlinear element portion includes a transistor and a transmission line, the back gate of the transistor is connected to the transmission line, the transmission line is connected to ground, and has a total length based on the wavelength λ of a transmission signal transmitted to the nonlinear circuit, and the total length is equal to or greater than 0.8×λ / 4 and equal to or less than 1.2×λ / 4.SELECTED DRAWING: Figure 1

To provide a square root circuit capable of generating a highly accurate output value by suppressing and reducing the influence of a base current error.SOLUTION: In the square root circuit, a translinear circuit is configured by the first transistor 1 to the fourth transistor 4 using NPN bipolar transistors, and the fifth transistor 5 to the seventh transistor 7 using NMOS transistors are provided so that a base current error of the first transistor 1 to the fourth transistor 4 does not directly appear in the output current IOUT, and even if there is a base current error, the output current IOUT accurately proportional to the square root of the input current IIN is obtained.SELECTED DRAWING: Figure 1

The application provides a wide voltage, constant output power and wide output voltage linear circuit, an MCU voltage detection circuit detects the voltage of input voltage dividing resistors and judges the size of the input voltage; the MCU outputs a corresponding duty ratio PWM1 signal to drive a charging switch to be turned on according to the size of the input voltage, and an electrolytic capacitor enters a charging state; the MCU voltage detection circuit also detects the voltage of output voltage dividing resistors and judges the size of the output voltage; the MCU outputs a corresponding duty ratio PWM2 signal to drive a discharging switch to be turned on according to the size of the output voltage, and the electrolytic capacitor enters a discharging state. The wide voltage, constant output power and wide output voltage linear circuit solves the problem that the traditional linear scheme cannot have a wide voltage input and the output voltage range is limited. The application also provides an LED lamp, and the driving circuit thereof is the wide voltage, constant output power and wide output voltage linear circuit.

The invention belongs to the technical field of semiconductor integrated circuits, and particularly relates to a band-gap reference circuit with subrange piecewise linear compensation and a control method. According to the invention, the core circuit realizes temperature segmentation processing by superposing the current with positive and negative temperature coefficients, combining with the digital-to-analog converter and finely adjusting the proportion of the current with the positive and negative temperature coefficients in different temperature intervals through the comparator. On the basis, a sub-range linear circuit is introduced into each temperature sub-interval, the influence of the second-order temperature coefficient on the output reference voltage is effectively restrained, and therefore the temperature stability is improved. And in order to ensure that the residual influence of the first-order temperature coefficient can be further eliminated after compensation of the sub-temperature sections, the DAC is adopted to realize detailed adjustment of the first-order temperature coefficient, and the robustness of the circuit to process deviation is improved.

This invention discloses a harmonic balancing method, device, and medium based on a neural network, belonging to the field of nonlinear circuit simulation analysis. The method includes the following steps: S1, establishing the node voltage equations of the nonlinear circuit; S2, constructing a neural network and an error function: constructing a three-layer BP neural network, where the input layer is a discrete time sequence of a complete cycle; the hidden layer includes a set of trigonometric functions of harmonic components or mixed frequency components; the output layer is the steady-state solution of the node voltage equations of the nonlinear circuit; the error function is constructed based on the node voltage equations of the nonlinear circuit; S3, training the constructed neural network to obtain the steady-state solution satisfying the node voltage equations of the nonlinear circuit. This invention avoids the frequent time-frequency transformations in the wave balancing method during iteration and is applicable to single-tone and multi-tone excitation. Simultaneously, it has high accuracy and good convergence, and is a method independent of initial values, making it very suitable for the periodic response analysis of nonlinear circuits.

A traction battery controller of an electrified vehicle controls the traction battery based in part on a value of a non-linear circuit element of a model of the traction battery in which the value of the non-linear circuit element is estimated in part on distribution of relaxation time (DRT) information of measured impedance data of the traction battery.

The invention provides a computer readable storage medium, an estimation method, a learned model, and a method of generating the learned model. A computer-readable storage medium causes a computer to function as: an acquisition unit (22) that acquires first information pertaining to a linear circuit having a plurality of ports for inputting or outputting a high-frequency signal and second information pertaining to the frequency of the high-frequency signal; a first estimation unit (24) that, when the second information indicates that the frequency is 0 Hz, estimates S parameters for two ports among the plurality of ports at the frequency of 0 Hz on the basis of a first learned model on the basis of the first information; when the second information indicates a frequency other than 0 Hz, a second estimation unit (26) estimates an S parameter at the frequency on the basis of a second learned model on the basis of the first information and the second information.

In a general aspect, a superconducting quantum processing circuit includes a tunable qubit device. The tunable qubit device includes a circuit loop configured to receive, during operation of the tunable qubit device, a magnetic flux that controls a qubit frequency of the tunable qubit device. In some aspects, the circuit loop consists of: a single non-linear circuit element and one or more linear circuit elements. The single non-linear circuit element is a Josephson junction connected between a first circuit node and a second circuit node. The one or more linear circuit elements includes a linear inductor connected in parallel with the Josephson junction between the first circuit node and the second circuit node.

The invention relates to a memristor simulation circuit, a memristor array and a memristor neural network circuit. The memristor simulation circuit comprises a power supply, an input module, a nonlinear circuit module, a volatile / non-volatile switching circuit module and a feedback circuit module. The memristor is switched to be in a volatile mode or a non-volatile mode by controlling on-off of the first triode, the second triode and the third triode. Compared with the prior art, the memristor simulation circuit disclosed by the invention has two characteristics of volatility and non-volatility, and the memristor can be reused on the neural network circuit, so that the same hardware circuit can be compatible with a multi-mode neural network.