654results about "Frequency selective two-port networks" patented technology

The invention discloses a dual-compensation active common-mode EMI filter based on impedance mismatch and a design method thereof, and belongs to the technical field of filter design, the dual-compensation active common-mode EMI filter is connected between an interfered end and an interference source end, the dual-compensation active common-mode EMI filter comprises a voltage sampling circuit, a signal amplification circuit and a compensation circuit, the compensation circuit comprises a voltage injection module and a current injection module, the first end of the voltage injection module is connected with the first end of the voltage sampling circuit, the second end is connected with the second end of the signal amplification circuit, and the third end is connected with the first end of the interference source end; the first end of the current injection module is connected with the second end of the signal amplification circuit, the second end is connected with the third end of the voltage injection module, and the third end is connected with the second end of the interference source end. According to the invention, the insertion loss of the filter can be significantly improved, the filter has an effective bandwidth enough to cover and conduct electromagnetic interference, has better attenuation on full-band noise signals, and has the advantages of small size and high insertion loss.

The invention discloses an ultra-wideband 6-bit numerical control attenuator with low attenuation amplitude error and low phase change. The digital attenuator is composed of six attenuation units of 0.5 dB, 1 dB, 2 dB, 4 dB, 8 dB and 16 dB. The attenuation units are cascaded according to the attenuation amounts of 0.5 dB, 4dB, 16dB, 8dB, 2dB and 1dB, the attenuation units with the attenuation amounts of 0.5 dB and 1dB adopt a simplified T-shaped structure, the attenuation unit with the attenuation amount of 2dB adopts a bridge T-shaped structure, the attenuation unit with the attenuation amount of 4dB adopts a pi-shaped structure with bypass capacitance compensation, and the attenuation unit with the attenuation amount of 8dB adopts a pi-shaped structure with a bypass compensation capacitor and a branch communication compensation capacitor. And the attenuation unit with the attenuation amount of 16dB is formed by cascading two improved 8dB SPDT switch path type attenuation units. According to the invention, reverse compensation is carried out on phase lag caused by a low-pass filtering network formed by a reference state of a traditional attenuation structure or phase lead caused by a high-pass filtering network formed by an attenuation state, so that the phases of the two are close, and the phase difference between the reference state and the attenuation state is greatly reduced.

An electronic component is provided that includes a substrate, an insulator layer expanding over a surface of the substrate, a planar conductor on the substrate or in the insulator layer and expanding in a plane parallel to the surface of the substrate, and an inductor conductor pattern on the insulator layer or in the insulator layer. When viewed in a direction perpendicular to the surface of the substrate, a length in a longitudinal direction of a region in which a region with the inductor conductor pattern overlapping the planar conductor is represented by Ls, and a distance between the inductor conductor pattern and the planar conductor is represented by d, such that Ls / d is 1 or more and 60 or less.

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.

Methods and apparatus for filtering a signal using a current mode filter circuit that enables source degradation. An example filter circuit generally includes an input node; an output node; a power supply node; a first transistor including a drain coupled with the input node; a second transistor including a drain coupled with the output node and including a gate coupled with a gate of the first transistor; a capacitive element coupled between a drain of the first transistor and the power supply node; a first resistive element coupled between the drain electrode and the gate electrode of the first transistor; a first source degeneration element coupled between a source of the first transistor and the power supply node; and a second source degeneration element coupled between a source of the second transistor and the power supply node.

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.

The invention discloses a TSV-based tunable inductor structure and a tuning method thereof, the tunable inductor structure comprises a primary side inductor and an auxiliary inductor, the primary side inductor is nested in the auxiliary inductor to form a nested tunable inductor structure; wherein the auxiliary inductor is connected with the modulation source, and the primary inductor is connected with an actual application circuit, so that a voltage difference between a voltage V1 between two ports of the primary inductor and a voltage V2 between two ports of the auxiliary inductor is regulated and controlled through the modulation source, and the primary inductor and the auxiliary inductor are mutually coupled under the action of the voltage V1 and the voltage V2; and the inductance tuning of the primary side inductor is realized. According to the TSV tunable inductor, the TSV tunable inductor structure which is small in tuning range, large in area and high-frequency performance degradation of a traditional tunable inductor is converted into a TSV tunable inductor structure which is based on the magnetic coupling technology, is small in area and wide in tuning range and can be continuously tuned.

The invention relates to the technical field of wireless communication, and provides a power synthesis circuit and a power amplifier. Comprising a first signal input end, a second signal input end, an input impedance matching circuit, a first harmonic suppression circuit, a second harmonic suppression circuit, a first high-pass filter circuit, a second high-pass filter circuit, a low-pass filter circuit and a signal synthesis output end, the low-pass filter circuit comprises a first inductor, a second inductor and a first capacitor; the first end of the first inductor serves as the first input end of the low-pass filter circuit, the first end of the second inductor serves as the second input end of the low-pass filter circuit, the second end of the first inductor is connected with the first end of the first capacitor and the second end of the second inductor and serves as the output end of the low-pass filter circuit, and the second end of the first capacitor is grounded. The power synthesis circuit has the impedance conversion characteristic, and has the advantages of low cost, high isolation, high integration and the like.

The invention provides an analog correlation circuit of a synthetic aperture radiometer receiver, and relates to the technical field of weak signal detection and processing. The circuit comprises a high-stability power supply reference unit, a high-performance broadband multiplication unit, a low-noise amplification unit and a high-linearity differential active filtering unit, wherein a second-order differential active filter in the high-linearity differential active filtering unit is used for carrying out noise filtering and low-noise amplification on a low-noise amplifier output signal in a differential form, and a differential signal of which the bandwidth is matched with the variation range of the amplitude of a target radiation brightness temperature signal and the amplitude meets the subsequent analog-to-digital conversion requirement is output. The high-linearity differential active filtering unit designed by the invention is realized by a second-order differential active filter formed by connecting two differential active filters in series, a low-pass filter with the cut-off frequency as low as possible filters noise in a link to the maximum extent, only the bandwidth matched with signal change is reserved, the amplitude which is two times of that of a single-ended signal can be provided, and the filtering efficiency is improved. And the linearity and the signal-to-noise ratio performance are better.

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.

A noise filter includes: a noise detector which detects voltage due to electromagnetic noise generated by a power converter and outputs adjusted voltage obtained by adjusting the detected voltage; a compensation signal applicator which superimposes compensation voltage having a polarity opposite to the voltage due to electromagnetic noise, on an output or an input of the power converter via a transformer; and an injection voltage generator which generates, on the basis of the adjusted voltage, first output voltage and second output voltage having a polarity opposite thereto, for generating injection voltage between one end and another and of a primary-side winding of the transformer, and outputs the first output voltage and the second output voltage to the one end and the other end, respectively.

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.

A bidirectional adaptive current sampling circuit comprises a sampling unit, a sampling switching module, a first differential current sampling circuit, a second differential current sampling circuit and a control module. The sampling unit is connected in the main circuit to obtain sampling current; the control module controls the sampling switching module to perform switching in a communication manner, so that the sampling unit is accessed to the first differential current sampling circuit and the second differential current sampling circuit in a forward direction or a reverse direction; the first differential current sampling circuit and the second differential current sampling circuit acquire different amplification signals based on the sampling current; the control module generates a current sampling signal based on the different amplified signals and a set threshold. According to the bidirectional self-adaptive current sampling circuit, the sampling switching module is arranged, bidirectional current sampling can be achieved, so that the sampling range is widened, the sampling precision can be met through different differential current sampling circuits, and the sampling result is more accurate.

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.

The invention relates to an electromagnetic coil excitation signal modulation device and method. A control module outputs a PWM signal of a target frequency to a signal adjustment module, and sends a control voltage corresponding to the target frequency to a voltage-controlled adjustable center frequency point band-pass filter; the signal adjusting module receives the output voltage sent by the control module, performs feedback adjustment according to the output voltage and a sampling signal output by the feedback sampling module, and outputs an amplified PWM signal with the same frequency as the PWM signal to the voltage-controlled adjustable center frequency point band-pass filter; the voltage-controlled adjustable center frequency point band-pass filter modulates the amplified PWM signal into a same-frequency sine wave signal according to the control voltage sent by the control module and sends the same-frequency sine wave signal to the power amplification module; and the power amplification module performs power amplification on the same-frequency sine wave signal and outputs an excitation signal to the electromagnetic coil. On-line continuous adjustment of a center frequency point is supported, signal modulation is more accurate, and the use reliability in a complex electromagnetic environment 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 circuit detects zero crosses in an input-signal and includes a low-pass-filter (LPF) receiving the input-signal and introducing a phase-shift dependent on the frequency thereof. Filter circuitry receives the output of the LPF, applies a fixed phase-shift thereto, and adjusts phase and DC-offset thereof based on control signals to produce a filtered output-signal. Control circuitry has a zero-crossing detector receiving the input-signal and the filtered output-signal, detecting zero-crossings of the input-signal and the filtered output-signal, asserting a digital zero cross signal at each zero crossing, and determining a phase-shift and DC-offset between the input-signal and filtered output-signal. The control circuitry has a controller generating the control signals, based upon the phase-shift and DC-offset, so a total phase-shift between the input-signal and the filtered output-signal is constant and there is a same duty-cycle between the input-signal and the filtered output-signal, providing for accurate zero-crossing detection.

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.