27 results about "Linear circuit" patented technology

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.

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.

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 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.

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.

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.

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 provides a transformer nonlinear circuit solving method and a related device, and the method comprises the steps: carrying out the experiment of a target transformer, building a first equivalent circuit model, carrying out the data collection, obtaining first excitation characteristic data, carrying out the fitting of first excitation characteristic data, obtaining a first fitting function, carrying out the linear processing of the first equivalent circuit model, and obtaining a second fitting function; obtaining a second equivalent circuit model; solving the second equivalent circuit model according to an external condition to obtain a first circuit parameter; constructing a geometric model corresponding to the target transformer according to the prototype platform, and performing a verification experiment on the geometric model to obtain reference circuit parameters; and if the error between the first circuit parameter and the reference circuit parameter is smaller than a preset error threshold, determining that the second equivalent circuit model meets a preset requirement, and taking the first circuit parameter as a target circuit parameter. By establishing the equivalent circuit model and performing linearization processing, the accuracy of solving the nonlinear circuit of the transformer can be improved.

The utility model relates to the technical field of switching power supplies, and discloses a high-efficiency adjustable linear circuit, which comprises a BACK circuit, a control circuit, an MCU and a low dropout regulator LDO, the BACK circuit comprises a DC / DC chip, the VCCOUT end of the DC / DC chip is electrically connected with the low dropout regulator LDO, the low dropout regulator LDO comprises a triode Q5, a triode M3, a capacitor C81, a resistor R65 and a resistor R59, and the triode Q5, the triode M3, the capacitor C81, the resistor R65 and the resistor R59 are electrically connected with the control circuit. The VCCOUT end of the DC / DC chip is conducted with the C ends of the triode Q5 and the triode M3, the E end of the triode Q5 is connected to the OUT-end through a resistor R65, the E end of the triode M3 is connected to the OUT + end, and the OUT + end is connected with the control circuit. The circuit is low in power consumption and high in efficiency, voltage and current output by the low dropout linear stabilizer LDO are in a linear relation, stability and reliability of the circuit are improved, voltage drop can be reduced, efficiency can be improved, and heating can be reduced due to the fact that following type dropout voltage control is adopted.

The application discloses a high-precision bipolar linear high-voltage regulating circuit and belongs to the technical field of linear regulating circuits. The high-precision bipolar linear high-voltage regulating circuit comprises an operational amplifier U1, triodes Q1-Q4, a negative high-voltage end -HV, a positive high-voltage end +HV, an input control voltage end VSET and an output end VOUT. The positive input end of the operational amplifier U1 is connected with the input control voltage end VSET in series with a resistor R1, the negative input end is grounded in series with a resistor R2, the output end and the negative input end are connected with a capacitor C1 in parallel, the output end is connected with the emitter of the triode Q3, the base of the triode Q3 is grounded, the collector of the triode Q3 is connected with the base of the triode Q4, the emitter of the triode Q4 is directly connected with the negative high-voltage end -HV, the collector of the triode Q4 is connected with one end of a resistor R5 and the emitter of the triode Q2, and the other end of the resistor R5 is connected with one end of a resistor R6. The high-precision bipolar linear high-voltage regulating circuit realizes a bipolar, adjustable, high-precision and high-voltage output linear circuit at low cost.

A terahertz (THz) frequency multiplier device is disclosed. The device includes a first metallic waveguide that receives, in its first interior space, an input electromagnetic field oscillating at an input frequency. A dielectric waveguide extends partly within the first interior space and is terminated with an output port located outside the first interior space. A nonlinear circuit element is coupled to the dielectric waveguide in the first interior space. The element is excited by the input field to generate an electrical current containing harmonics of the input field and inducing an output electromagnetic field within the dielectric waveguide at an output THz frequency corresponding to one of the harmonics. A second metallic waveguide receives a portion of the dielectric waveguide extending outside the first interior space, the second waveguide being configured to impede propagation of the input field while allowing propagation of the output field toward the output port.

The application discloses a model order reduction method, system, terminal and computer readable storage medium of a multi-port linear circuit. The method comprises the following steps: obtaining a to-be-reduced circuit model, reducing the number of ports of the to-be-reduced circuit model according to a port reduction strategy, and obtaining a target circuit model; based on the target circuit model, a residual module and a tensor mapping structure, a target mapping equation is constructed, the tensor mapping structure is used to represent the correlation between the to-be-reduced circuit model and the target circuit model, and the residual module is used to predict the corresponding output according to the input; training data sets are generated according to the to-be-reduced circuit model, the residual module and the tensor mapping structure in the target mapping equation are trained, and a trained target mapping equation is obtained; and a reduced order result is generated according to the target circuit model and the trained target mapping equation. The application can use the trained target mapping equation on the basis of the target circuit model, so that the accuracy of the multi-port model after order reduction can be improved.

A method for active circuit antenna optimization includes recording a capacitance value at each frequency of a frequency range using one or more tuning capacitors, thereby generating a capacitor value frequency range. The method further includes creating one or more non-linear circuit designs in an RF circuit simulator. The one or more non-linear circuit designs match the capacitance value at each frequency of the frequency range recorded from the one or more tuning capacitors. The method then includes creating one or more non-linear circuits from the non-linear circuit design. Each tuning capacitor has a corresponding non-linear circuit where all the one or more non-linear circuits match the capacitor value frequency range of the one or more tuning capacitors.

An integrated circuit includes current-mode circuitry implemented on a substrate. The current-mode circuitry includes i) a plurality of instances of a translinear circuit, and ii) a plurality of selection circuits coupled to respective instances of the translinear circuit, each selection circuit configured to selectively disable the respective instance of the translinear circuit. The current-mode circuitry is configured to generate a first output using one or more instances of the translinear circuit that are not disabled by one or more respective selection circuits. Drive circuitry is also implemented on the substrate and is coupled to the current-mode circuitry. The drive circuitry is configured to generate a second output using the first output of the current-mode circuitry.

The invention relates to the technical field of integrated circuits, and provides a nonlinear circuit transient simulation method and related equipment, and the method comprises the steps: obtaining a circuit state of a nonlinear target simulation circuit at a current simulation moment; constructing a second-order exponential integral model of the target simulation circuit based on the circuit state of the target simulation circuit at the current simulation moment; constructing an iteration solver based on the second-order exponential integral model, and constructing a structure precondition device based on the target simulation circuit; performing iterative solution according to the iterative solver and the structure precondition device to obtain a predicted circuit state of the target simulation circuit at the next simulation moment of the current simulation moment; and simulating the target simulation circuit based on the predicted circuit state. According to the method, the transient simulation precision and efficiency of the nonlinear circuit can be improved.

The invention relates to a non-inductive chaotic neuron circuit based on a second-order flow control memristor, and belongs to the technical field of neuromorphic calculation and nonlinear circuits. The circuit adopts a very simple parallel structure and is only composed of a current source, a capacitor and a second-order flow control local active memristor. According to the memristor, through nonlinear coupling of two internal state variables, local active characteristics are provided, and meanwhile, the memristor and a capacitor naturally form a three-order dynamic system together. According to the design, an external complex topology required by a traditional neuron circuit is replaced by the complexity of the device, and high-level neurodynamics behaviors such as chaos and tufting can be realized without an inductance element. Simulation results prove that the circuit can generate stable chaotic attractors under specific parameters. According to the invention, the implementation complexity of neuromorphic hardware is obviously reduced, and the method has the characteristics of simple structure and rich functions, and has a better application prospect in the field of high-integration brain-like chips.

This application provides a metasurface absorber and its array, as well as a nonlinear circuit. The metasurface absorber includes a dielectric substrate with: a first metal sheet disposed on a first surface of the dielectric substrate, the edge of the first metal sheet coinciding with the edge of the first surface; and a second metal sheet disposed on a second surface of the dielectric substrate, two opposite edges of the second metal sheet not coinciding with corresponding edges of the second surface, and the remaining edge of the second metal sheet coinciding with the remaining edge of the second surface. The second metal sheet has a lumped port, dividing it into two sub-metal sheets symmetrically arranged about the lumped port, with the lumped port extending from one of the opposite edges to the other. Each sub-metal sheet has a rectangular slot, wherein the two rectangular slots on the two sub-metal sheets are symmetrically arranged about the lumped port. This application provides a metasurface absorber that achieves dual-frequency waveform selection and features a small frequency ratio.

A physical reservoir element includes a first input terminal, a second input terminal, a first sample and hold circuit, a first output terminal, and a first non-linear circuit. The first input terminal is configured to be connectable to an input source that transmits an input signal to a physical reservoir. The second input terminal is configured to be connectable to one or more other physical reservoir elements. The first nonlinear circuit is disposed between the first input terminal and the first sample and hold circuit. A first terminal of the first sample and hold circuit is configured to receive a combined signal obtained by combining signals from the first input terminal and the second input terminal, and a second terminal of the first sample and hold circuit is connected to the first output terminal. The first output terminal is configured to be connectable to one or more other physical reservoir elements. The first sample and hold circuit holds and converts the combined signal.

Method and apparatus for a magnetic sensor device having a magnetic field sensing element to generate an output signal and a signal processing module coupled to the magnetic field sensing element, the signal processing module including linearization module having an analog translinear circuit.

A method and a system for large-scale linear circuit simulation, a circuit simulator and a storage medium are provided. The method includes: constructing ordinary differential equations for a linear circuit and converting the ordinary differential equations into a large-scale sparse system of linear equations; performing column reordering on a coefficient matrix of the large-scale sparse system of linear equations, obtaining a pre-reordered matrix; utilizing partitioning partition algorithm to perform row-column reordering, obtaining a doubly bordered-block diagonal matrix; employing a plurality of compute nodes, solving for local Schur complements of each of the distributed nodes, and summing up the local Schur complements to obtain a global Schur complement; solving for states of each of the distributed nodes at a current time step; and converting solution results from all time steps of each of the distributed nodes into a simulation result. The method significantly improves simulation efficiency while ensuring smooth simulation execution.