491results about "Frequency selective two-port networks" patented technology

A filter multiplexer for variable bandwidth annealing selection is described. The filter multiplexer has multiple pathways, where each pathway comprises a switch and a filter. Each filter has a different cutoff frequency from the other filters. Switches may be cryogenic switches. Each pathway may be communicatively coupled to an external annealing line. Upon receiving a problem, an annealing bandwidth can be selected, set or configured via the multiplexer to operate a quantum processor with a desired annealing schedule. The multiplexer may be used for calibration of a quantum processor by performing a calibration with a large annealing bandwidth, then calibrating the quantum processor by iterating through all available annealing bandwidths from the multiplexer.

A device for implementing a non-reciprocal bandpass filter is provided. The device includes a plurality of capacitively-coupled shunt resonators. Each capacitively-coupled shunt resonators includes a plurality of superconducting quantum interference devices (SQUIDs) connected to each other, a flux line inductively coupled to the plurality of SQUIDs, and a capacitor connected in parallel to the plurality of SQUIDs.

A method and apparatus for converting an input frequency to a voltage signal using a passive band-pass filter. The method includes providing an input signal having a specified frequency and amplitude to a passive band-pass filter. The method also includes obtaining an attenuated signal corresponding to the input signal from the passive band-pass filter. The method also includes providing the attenuated signal to a peak detector to obtain a direct current (DC) signal having an output voltage proportional to the specified frequency. The passive circuitry includes a first circuit to receive an input signal having a specified frequency and amplitude, and output an attenuated signal corresponding to the input signal. The passive circuitry also includes a second circuit to convert the attenuated signal to a DC signal having an output voltage proportional to the specified frequency.

The invention relates to the technical field of signal processing, in particular to a microseismic sensor front-end signal conditioning circuit based on lag correction frequency expansion. The microseismic sensor front-end signal conditioning circuit based on lag correction frequency broadening comprises a differential amplification circuit used for converting a differential signal input by a microseismic sensor into a single-ended vibration signal and carrying out pre-amplification processing on the vibration signal according to a preset gain to obtain an amplified vibration signal; and the filtering and lag correction circuit is used for widening the frequency range of the amplified vibration signal in a filtering and lag correction mode to obtain a conditioned vibration signal. According to the invention, frequency expansion can be carried out on the magnetoelectric sensor through a low-frequency compensation technology, and the response capability of the magnetoelectric sensor to a low-frequency signal is improved.

To provide a filter stage system.SOLUTION: A filter stage system includes a continuous time baseband filter comprising a feedback loop that employs at least one first impedance node and at least one second impedance node. The at least one first impedance node has a higher impedance than the at least one second impedance node. The at least one first impedance node provides a dominant pole, and the at least one second impedance node provides a non-dominant pole. The continuous time baseband filter generates a filtered current. The filter stage system also includes a mirroring component that mirrors the filtered current to an output.SELECTED DRAWING: Figure 2

The invention provides a process weak correlation frequency adjustable anti-aliasing filter circuit which is characterized by comprising a current generation module, a current mirror module, a control voltage generation module and an MOSFET-C anti-aliasing filter module. The anti-aliasing filter circuit with the adjustable frequency has the remarkable advantages that the anti-aliasing filter circuit with the adjustable frequency can generate cut-off frequency linearly related to the frequency of an input clock signal, and the anti-aliasing filtering function with the adjustable frequency is achieved. In addition, the circuit can effectively reduce the influence of technological parameters on the cut-off frequency, has good circuit performance, and meanwhile, compared with a cut-off frequency adjusting method of an existing on-chip filter circuit integrated control loop, the circuit is simple in structure, small in introduction power consumption and low in cost. And the anti-aliasing filtering requirement of the ADC acquisition front end within the input clock signal frequency range of 10 kHz to 100 kHz can be met.

A noise reduction circuit includes: noise canceler circuitry configured to inject a compensation current into a power line and ground to reduce a common mode noise current that flows through the power line and the ground into a commercial power supply from a power converter with a switching element connected to the commercial power supply; and overcurrent inhibitor circuitry provided on a compensation current path through which the compensation current flows, the overcurrent inhibitor circuitry being configured to inhibit application of an overcurrent to the noise canceler circuitry.

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

A filter stage system comprising a continuous-time baseband filter comprising a feedback loop employing at least one first impedance node and at least one second impedance node, wherein the at least one first impedance node has a higher impedance than the at least one second impedance node, and wherein the at least one first impedance node provides a dominant pole and the at least one second impedance node provides a non-dominant pole, and wherein the continuous-time baseband filter generates a filtered current, and a mirror component mirrors the filtered current to an output.

The present application relates to the technical field of communications, and in particular to a switch-based compact phase shifter and an integrated phase shifter, which solve the problems of excessive size and costs of existing phase shifters. The switch-based compact phase shifter comprises: a first filter network, the first filter network being an Nth order high-pass filter network; a second filter network, the second filter network being an Mth order low-pass filter network; and a third filter network, the third filter network being an Rth order low-pass filter network; wherein: the first filter network, the second filter network, and the third filter network are connected in parallel by means of a double-pole three-throw switch; and when the second filter network is turned on alone, the insertion phase of the switch-based compact phase shifter is a reference phase; when the third filter network is turned on alone, the insertion phase of the switch-based compact phase shifter is a first phase; when only the first filter network and the second filter network are turned on, the insertion phase of the switch-based compact phase shifter is a second phase; and when only the first filter network and the third filter network are turned on, the insertion phase of the switch-based compact phase shifter is a third phase.

The invention belongs to the technical field of radio frequency amplification circuits, and particularly discloses a short-wave receiving amplification circuit capable of realizing cascade transmission and a short-wave communication system. According to the invention, direct current and interference in a previous-level signal are filtered through the filtering module, a pure radio frequency signal is obtained, and a foundation is laid for subsequent processing; the signal strength is improved through the amplification module, and single-stage transmission attenuation is overcome; the key point is that the balance gain module applies gain processing which is compensated for the loss characteristic of a transmission link to the amplified signal, so that the signal strength can be accurately matched with the actual loss of the line, and the problem that a fixed gain mode cannot adapt to the multi-stage series accumulated loss is solved. Compared with the prior art, the scheme realizes stable cascade transmission of short-wave signals through cooperative work of the modules, and remarkably improves the transmission distance and reliability of the system through dynamic compensation accumulated loss.

An electronic device may have wireless circuitry that includes transceiver circuitry, first and second antennas, and first and second transmission line paths that couple the transceiver circuitry to the antennas. The transceiver circuitry may convey a first radio-frequency signal using a first radio access technology (RAT) over the first transmission line path and the first antenna and may concurrently convey a second radio-frequency signal using a second RAT over the second transmission line path and the second antenna. The wireless circuitry may include a switched notch filter on the first transmission line path and a switched bandpass filter on the second transmission line path. The switched notch filter may be a conjugate of the switched bandpass filter. The transceiver circuitry may scan the first radio-frequency signal over a set of bands while concurrently conveying the second radio-frequency signal without reconfiguring the filters.

An integrator direct current error elimination and low frequency noise reduction circuit based on Rogowski coils solves the technical problem of how to eliminate direct current errors in an integrator circuit composed of Rogowski coils, and adopts the technical scheme that the circuit comprises an integrating circuit composed of a first amplifier and an integrating capacitor, the in-phase end of the first amplifier is used as the current input end a of the Rogowski coil, and the key point is that a T-type network filter circuit is connected between the feedback output end b of the integrating circuit and the inverted input end of the first amplifier. The utility model has the advantages that due to the existence of the T-type network filter circuit, oscillation is avoided, feedback is taken from the tail end of the integral circuit, the direct current offset of the whole forward channel can be eliminated, the three-order high-pass filter function is realized, the maximum low-frequency noise is low, and the signal-to-noise ratio is improved.

Disclosed are example embodiments describing receiver circuits and methods for mitigating out-of-band blockers. The receiver circuits include a low noise transconductance amplifier (LNTA) stage, a down-conversion mixer stage, a post-mixer filter, and a gain stage. A feature is the reuse of supply currents from the post-mixer filter and the gain stage to supply the LNTA stage. The method involves down-converting an input signal, filtering the down converted signal through a current-mode notch filter, amplifying the filtered signal, and reusing a combined supply current for the LNTA stage.

The utility model discloses an ultrasonic echo signal processing circuit, which comprises a differential amplification circuit, a band-pass filtering amplification circuit, a voltage reference circuit and a power supply control circuit, the input end of the differential amplification circuit is connected with the ultrasonic transducer, and the output end of the differential amplification circuit is coupled with the input end of the band-pass filtering amplification circuit through a capacitor; the output end of the band-pass filtering and amplifying circuit is connected with the signal acquisition end of the signal processor; a power-on time sequence control end of the signal processor is connected to the differential amplification circuit and the band-pass filtering amplification circuit through the power supply control circuit; the voltage reference circuit is connected to the differential amplification circuit and the band-pass filtering amplification circuit. The device is used for amplifying and filtering echo signals received by an ultrasonic receiving transducer, so that the signal amplitude meets the requirement of a signal processor on the quality of the echo signals and the requirement on power consumption under the condition of battery power supply.

The invention discloses a simulated Kalman filter circuit based on a molybdenum disulfide (MoS2) memristive transistor. Efficient fusion of sensor data is realized in the field of automatic driving. According to the circuit, the Kalman filtering gain can be accurately adjusted by adjusting the conductance value of the MoS2 memristor transistor, so that the circuit is suitable for various automatic driving scenes. The simulated Kalman filter circuit can effectively fuse a laser radar and a millimeter wave radar, can accurately estimate the coordinates of a target vehicle, and can significantly reduce power consumption while realizing a data processing speed equivalent to that of a digital filter.

The invention provides an electroencephalogram signal anti-interference circuit based on internal and external cooperative inhibition of a chip, belongs to the field of electroencephalogram signal acquisition anti-interference, and is used for solving the problems that in the prior art, single internal or external anti-interference measures are difficult to cooperate, and the adaptability to complex noise is limited. The circuit comprises an external anti-interference circuit (comprising an electrode interface, a shielding protection module, a signal preprocessing module and a programmable filtering array) and a chip internal circuit (comprising a special filtering module, an interference suppression module, a pulse coding module and a double-domain analysis module), and parameter collaborative optimization is realized through a dynamic adjustment module, so that the anti-interference capability of electroencephalogram signals can be improved; signal stability and accuracy are enhanced, and a complex noise environment is adapted.

An inverter system controller for an automotive vehicle includes a housing and has disposed within the housing a Y-capacitor defining a terminal, a ground busbar, and a surface mount resistor in direct contact with the terminal and ground busbar to form an electromagnetic filter that lacks a printed circuit board.

A semiconductor device includes: a filter circuit including: a resistor; a MOS capacitor; and a MOM capacitor stacked on at least one of the resistor or the MOS capacitor, wherein the following inequalities are satisfied:Mc≥β−γ / β+γ×Mr Mr≤√{square root over (1 / 2πftαβ)}  [Math. 1]where ft denotes a cutoff frequency of the filter circuit, Mr denotes a resistor area of a resistor-provided region in which the resistor is provided, Mc denotes a MOS capacitor area of a MOS capacitor-provided region in which the MOS capacitor is provided, α denotes a resistivity of the resistor, β denotes a MOS capacitance rate of the MOS capacitor, and γ denotes a MOM capacitance rate of the MOM capacitor.

The utility model relates to the technical field of electronics, in particular to a sensor signal processing circuit and a signal processing device. The signal processing circuit comprises a signal amplification circuit, a filter circuit, an analog-to-digital conversion circuit and a power supply circuit. The input end of the signal amplification circuit is used for receiving a sensor, the output end of the signal amplification circuit is connected with the input end of the filter circuit, and the output end of the filter circuit is connected with the input end of the analog-to-digital conversion circuit; the output end of the power supply circuit is connected with power supply terminals of the signal amplification circuit, the filter circuit and the analog-to-digital conversion circuit. Firstly, a signal amplification circuit is adopted to amplify an analog voltage signal output by an ultrasonic sensor, then a filter circuit is adopted to filter the amplified analog voltage signal, and finally an analog-to-digital conversion circuit is adopted to convert the filtered analog signal into a digital signal which can be directly read by a microprocessor. And the application scene of the ultrasonic sensor is expanded.

A filter device includes a multilayer body, an input terminal, an output terminal, a first filter including first resonators, and a second filter including second resonators. In the first filter, a signal from the input terminal is transmitted to the second filter through the first resonators. In the second filter, the signal from the first filter is transmitted to the output terminal through the second resonators. Jump coupling is formed between one of the first resonators and one of the second resonators. One main coupling of the coupling between a first pair of the first and second resonators and the coupling between a second pair of the first and second resonators is magnetic coupling, and the other main coupling is electric field coupling.

A method for designing frequency filters, includes (a) setting up a simulation model of a power supply system with frequency filters; (b) determining initial set of filter parameters; (c) calculating the model using the filter parameters in time domain; (d) extracting safety-critical trajectories from the calculated model with underlying interference functions; (e) transforming safety-critical trajectories from time domain into frequency domain; (f) determining transfer functions in s-domain by system identification; (g) extracting pairs of residuals and poles based on transfer functions in s-domain; (h) determining energy loss and voltage stability values based on the residuals and poles; (i) varying the filter parameters; (j) repeating (c)-(h) with the filter parameters varied in step (i), until a termination criterion is reached; (k) after which, selecting, from a set of points with energy loss and voltage stability values determined in step (h), a point lying on a pareto-front of the set of points.

The invention discloses a high-isolation and high-selectivity filtering power divider with an input end broadband non-reflection characteristic. Comprising an input port, two output ports, a double-L-shaped non-reflection absorption structure, two microstrip connecting lines, two parallel coupling lines, two L-shaped step resonators, two non-reflection absorption isolation resistors, a quarter-wavelength parallel coupling connecting line and two U-shaped transmission lines. The input port is a first port; the two output ports comprise a port II and a port III; the double-L-shaped non-reflection absorption structure comprises a first non-reflection absorption resistor, a second non-reflection absorption resistor, a first L-shaped non-reflection absorption connecting line and a second L-shaped non-reflection absorption connecting line. According to the invention, the broadband reflection-free absorption characteristic of the input end and the broadband high isolation between the output ports are realized at the same time, a plurality of transmission zeros are introduced through the L-shaped step resonators, and the frequency selectivity and out-of-band rejection are improved.

To provide a detection device that can more excellently reduce occurrence of interference.SOLUTION: A detection device 1 includes: a detector 40 including first electrodes 421, ... 42n and second electrodes 411, 412; an MCU 60; an AFE 15 which generates a square wave Tx; and an active filter block 20 connected to the AFE 15 via a second isolator 16 and configured to receive the square wave transmitted via the second isolator 16. The active filter block 20 includes an LPF 23 and a DP 22. A frequency of a second reference potential GND 2 can be changed in accordance with an electric resistance value of the LPF 23. The second reference potential GND 2 based on output from the active filter block 20 is provided to the AFE 15 and the second electrodes 411, 412. A first reference potential GND 1 of the active filter block 20 is a fixed potential. The AFE 15 is configured to change a frequency of the square wave Tx.SELECTED DRAWING: Figure 1

A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.

The invention discloses a cascading signal processing circuit based on separation components, and belongs to the technical field of signal processing circuits. The cascading signal processing circuit comprises a first circuit, a second circuit, a cascading convergence point J1, a third circuit and a cascading convergence point J2. The circuit is composed of three circuit parts which are all designed by using separation elements, based on the cost and flexible layout advantages of the separation elements, parameter matching under the requirements of signal anti-shake and signal latching flexibility is achieved, and the circuit can respond to high-speed abrupt change signals and can also adapt to anti-interference application of conventional level or pulse signals. On the premise that the circuit topology is not changed, grouping cascading of multiple intra-group signals and multi-path cascading of multiple paths of signals are supported, and meanwhile infinite cascading of interrupt signals corresponding to the multiple paths of signals and time division multiplexing summarizing access of the interrupt signals are achieved; and the effects of reducing the circuit cost, the PCB layout flexibility, the function and performance adaptation flexibility and the cascade expansibility are obvious.

The utility model relates to a Ka frequency band multichannel frequency conversion assembly in the field of spaceflight measurement and control. The Ka frequency band multichannel frequency conversion assembly comprises a front selection filter, a low noise amplification unit, a switch selection network unit, a multichannel frequency conversion unit and an assembly power supply and control unit. Wherein each channel comprises a front selection filter and a low-noise amplification unit; the switch selection network is used for shunting each path of input signal and selecting the signal through a multi-stage switch; the multi-channel frequency conversion unit completes frequency conversion of multi-channel signals and frequency multiplication, shunting and amplification of local oscillation signals; and the external imaging baseband unit issues control data to the component power supply and control unit to control the switch selection network output signal. According to the utility model, each frequency conversion link is subjected to twice frequency conversion, filters are arranged before and after frequency conversion, and the link spurious suppression degree is high. According to the utility model, all the modules are designed in an integrated manner, interconnection cables do not exist among the modules, the integration level is high, the reliability is high, the stray is less, and the anti-interference capability is strong.

A calibration method and a tuning method for an on-chip differential active RC filter are provided. The calibration method comprises: obtaining zero-crossing time of a differential signal outputted by a single-pole point real number filter by analyzing the single-pole point real number filter; setting a reference clock period according to the relationship between the zero-crossing time and the bandwidth of the single-pole point real number filter, and setting a calibration working time sequence according to the reference clock period; and scanning an RC configuration of an RC array according to the calibration working time sequence to realize calibration of the RC array.

The present invention relates to a method for operating a differential filter device (1) which can be calibrated and which comprises: a first branch (2), in particular provided for a main signal; a second branch (3), in particular provided for a complementary signal which is inverted in comparison with a main signal; first calibration means (4) for setting at least one filter frequency of the first branch (2); and second calibration means (5) for setting at least one filter frequency of the second branch (3); in which method at least one filter frequency of the first branch (2) is set using the first calibration means (4) and / or at least one filter frequency of the second branch (3) is set using the second calibration means (5), the at least one filter frequency of the first branch (2) being different from the at least one filter frequency of the second branch (3).

A coupled resonator filter including a first parallel resonator including a first capacitance connected in parallel with a first inductance. The filter includes a second parallel resonator including a second capacitance connected in parallel with a second inductance and a third parallel resonator including a third capacitance connected in parallel with a third inductance. Magnetic coupling between the first inductance and the second inductance, between the second inductance and the third inductance, and between the first inductance the third inductance occurs in accordance with first, second and third coupling factors, respectively. A frequency response of the coupled resonator filter includes a notch when values of the first coupling factor, the second coupling factor and the third coupling factor satisfy predetermined conditions.