Abstract: An adaptive electromagnetic interference (EMI) detection and reduction device for multi-port applications is provided. The invention includes at least two physical devices (PHY), where the PHYs transmit data along wire pairs to a register jack (RJ). The transmissions create EMI along the wire pairs, where the transmissions have constructively interfering resonant frequencies having phases and amplitudes. An antenna is disposed proximal to each RJ, where the antennae detect each frequency. A resonating network determines a peak amplitude of each frequency, an envelope detector amplifies each peak amplitude from the resonating network. A discretization circuit converts the amplified peak to discrete amplitude values, where the discretization circuit transmits the discrete amplitude values to a controller.

Abstract: An electromagnetic bandgap structure and a printed circuit board that intercepts to transfer a signal having a predetermined frequency band are disclosed. In particularly, the electromagnetic bandgap structure includes a first metal layer and a second metal layer; a metal plate, placed between the first metal layer and a second metal layer; a multi-via, penetrating the first metal layer, passing through the same planar surface as an outer metal layer and turning toward the first metal layer to connect the metal plate and the first metal layer; and a dielectric layer, stacked in between the first metal layer and the metal plate, between the metal plate and the second metal layer and between the first metal layer and the outer metal layer. With the present invention, a bandgap frequency can be decreased without increasing the size of the metal plate.

Abstract: A substrate for a semiconductor package includes a dielectric substrate, a circuit pattern formed on a first surface of the dielectric substrate, and an electromagnetic band gap (EGB) pattern. The EGB pattern includes multiple unit structures formed on a second surface of the dielectric substrate, where each unit structure includes a flat conductor electrically connected to the circuit pattern through a ground connection, and multiple spiral-patterned conductors electrically connected to the flat conductor. The second surface is formed on an opposite side of the dielectric substrate from the first surface. Each flat conductor is electrically connected to a flat conductor of another one of the unit structures. At least one of the spiral-patterned conductors in each one of the unit structures is electrically connected to another one of the spiral-patterned conductors.

Abstract: The invention provides a method of transferring single ended signal with interference-resistance. The transmission of the single ended signal includes an input device and an output device. The output device has its signal output terminal connected with a signal input terminal of the input device. A signal floating isolation circuit is connected with the signal output terminal of the output device and/or signal input terminal of the input device. The output signal or input signal is output or input via this floating isolation circuit. The isolation reference terminal of the output signal is coupled to ground of the output device through the isolation impedance, and/or the isolation reference terminal of the input signal is coupled to the ground of the input device. The signal output reference terminal of the output device and the signal input reference terminal of the input device are connected with each other.

Abstract: A transmission system for a digital signal includes a transmitter and a receiver connected thereto by a transfer bus. The transmission system includes at least one conductive line capacitively coupled with the transfer bus.

Abstract: A filter includes a first magnetic layer, a second magnetic layer, an insulating layer, a plurality of coils, a first non-magnetic layer and a second non-magnetic layer. The insulating layer is disposed between the first magnetic layer and the second magnetic layer, and the coils are disposed in the insulating layer. The first non-magnetic layer is disposed on one side of the first magnetic layer, which is far away from the insulating layer, and the second non-magnetic layer is disposed on one side of the second magnetic layer, which is far away from the insulating layer.

Abstract: A semiconductor device interconnecting unit configured to input/output a high-frequency signal having a millimeter wave band to/from a semiconductor device is provided. The semiconductor or device interconnecting unit includes a part of a band pass filter configured to pass therethrough the high-frequency signal having a millimeter wave band by using an LC resonance circuit, and a remainder of the band pass filter, wherein the part and the remainder are separated from each other. The part is provided inside the semiconductor device, and the remainder is provided outside the semiconductor device. The part and the remainder include capacitors having variable capacitors added thereto, respectively. A pass band for the high-frequency signal having a millimeter wave band is changed by changing capacitance values of the variable capacitors.

Abstract: A data transmitter uses a transmission line including a ground conductor (305), a signal conductor (201), and an insulating material (3) which insulates them from each other. The insulating material includes a dielectric (320) exhibiting a nonlinear relationship between a generated electric field and dielectric polarization. The effective reactance per unit length of the transmission line changes depending on the signal voltage. Data is transmitted between integrated circuits (102) via the transmission line, achieving data transmission at a higher speed than a conventional one.

Abstract: An electromagnetic interference (EMI) suppressor having a bandpass filtering function is provided. The EMI suppressor is disposed on a substrate, and includes a signal line, a ground line, an open-circuit line, a first line group, and a second line group. The signal line has an input terminal and an output terminal for feeding in and feeding out electromagnetic wave signals respectively. One terminal of the ground line is connected to the signal line and the other terminal is a ground terminal. One terminal of the open-circuit line is connected to the signal line and the other terminal is an open-circuit terminal. The first line group is formed by a first open-circuit line and a second open-circuit line, and is connected to the signal line. The second line group is formed by a third open-circuit line and a fourth open-circuit line, and is connected to the signal line.

Abstract: An electronic device comprising: a wiring substrate having a first power-supply wiring to which a first power-supply potential is applied and a second power-supply wiring to which a second power-supply potential lower than the first power-supply potential is applied; a microcomputer having first and second power-supply terminals in which the first power-supply terminal is connected to the first power-supply wiring and the second power-supply terminal is connected to the second power-supply wiring; and a connector connected to the first and second power-supply wirings, wherein an inductor element for correcting an impedance error of the first and second wirings is connected in series to either one of the first and second power-supply wirings. According to such configuration, unnecessary electromagnetic radiation posed by a common current can be suppressed.

Abstract: Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to the housing for an active implantable medical device (AIMD) which serves as an energy dissipating surface. A novel L-C input trap filter is provided which has a dual function. The L-C trap acts as a broadband low pass EMI filter while at the same time also acts as an L-C trap in order to divert induced RF energy from the lead to the housing of the AIMD.

Abstract: Disclosed is methodology and apparatus for producing an asymmetrical filter for use with implantable medical devices, and in other input filtering environments. Differing forward and reverse characteristic responses are provided by inserting a low value resistor in series with heart connecting leads so that EMI input protection may be provided without significantly reducing energy transfer from the protected device. Improved protection against voltage transients is provided with present arrangements of differentiated series impedance. Higher frequency energy is allowed out of a subject device than is allowed into such device, which allows for attenuation of undesired frequency ranges entering the filter while allowing output pulses to exit without distortion.

Abstract: A comb limiter combiner for front end filtering reduces bit error rates with an increased reception range. Notch filters are tuned to suppress interfering frequency-hopped signals. An output comb filter suppresses out-of-band intermodulation products generated by any non-linear devices (such as limiters and the notch filters) in each of the comb limiter combiner sub-bands. Sensitivity is further increased by the use of cryogenically cooled high temperature superconductor components for the filters, amplifiers, and limiters used in each sub-band.

Abstract: A filtering device is capable of suppressing common mode noises upon transmission of a differential signal, and includes a differential transmission line, a grounding layer, a dielectric unit and a conductive structure. The differential transmission line has a pair of conductive traces spaced apart from each other. The grounding layer is spaced apart from the differential transmission line. The dielectric unit is disposed between the differential transmission line and the grounding layer. The conductive structure is embedded in the dielectric unit, is coupled electrically to the conductive traces and the grounding layer, and cooperates with the differential transmission line, the grounding layer and the dielectric unit to form a stacked structure that has an effective negative permittivity, thereby suppressing the common mode noises coupled to the conductive traces. A differential signal transmission circuit is also disclosed.

Abstract: According to one general aspect, an apparatus may include a clock channel, a shielding tunnel, and clock repeaters. In various embodiments, the clock channel may be configured to carry the clock signal, and may include a portion of a metal layer of an integrated circuit. In some embodiments, the shielding tunnel may be configured to shield, in at least four directions, the clock channel from other signals, and may include portions of a at least three metal layers of the integrated circuit. The shielding tunnel may be connected to the positive and negative supplies in order to provide the required power for the clock repeaters.

Abstract: A magnetic interface circuit (100) includes a pair of channels (101, 102) and an absorb network (3). Each channel includes a 3-wire common mode choke (2) having a middle tap (21), and an isolation transformer (1) connected with the 3-wire common mode choke. The isolation transformer has a primary winding (11) and a secondary winding (12) each having a pair of first output taps (111, 121) and a first center tap (13, 14). The absorb network includes a bridge rectifying circuit (4) adapted for converting an electrical current. Each bridge rectifying circuit has a pair of input taps (45, 46) each connected with corresponding center taps of the isolation transformers, and a pair of output taps (47, 48).

Abstract: A transient voltage suppressing (TVS) circuit with uni-directional blocking and symmetric bi-directional blocking capabilities integrated with an electromagnetic interference (EMI) filter supported on a semiconductor substrate of a first conductivity type. The TVS circuit integrated with the EMI filter further includes a ground terminal disposed on the surface for the symmetric bi-directional blocking structure and at the bottom of the semiconductor substrate for the uni-directional blocking structure and an input and an output terminal disposed on a top surface with at least a Zener diode and a plurality of capacitors disposed in the semiconductor substrate to couple the ground terminal to the input and output terminals with a direct capacitive coupling without an intermediate floating body region.

Abstract: A power line arrangement includes a first power line and a second power line which crosses the first power line at least once. The first and second power lines are connected to a same power supply, and current in the first power line flows in a different direction from current in the second power line at an area where the first and second power lines cross.

Abstract: According to one general aspect, an apparatus may include a clock channel, a shielding tunnel, and clock repeaters. In various embodiments, the clock channel may be configured to carry the clock signal, and may include a portion of a metal layer of an integrated circuit. In some embodiments, the shielding tunnel may be configured to shield, in at least four directions, the clock channel from other signals, and may include portions of a at least three metal layers of the integrated circuit. The shielding tunnel may be connected to the positive and negative supplies in order to provide the required power for the clock repeaters.

Abstract: A method of improving electrical isolation between a first circuit and a second circuit sharing a common substrate having an effective dielectric constant greater than that of air. The first and second circuits are spaced apart and separated from one another by an intermediate portion of the substrate. The method includes removing a portion of the intermediate portion to replace the portion removed with air thereby reducing the effective dielectric constant of the intermediate portion. By reducing the effective dielectric constant of the intermediate portion, electrical isolation between the first and second circuits is improved thereby reducing crosstalk between the first and second circuits. In particular implementations, the method may be used to reduce alien crosstalk between adjacent communication outlets in a patch panel.

Abstract: A system and method for enhanced accuracy in cable diagnostics of cable length. Conventional cable diagnostics such as time domain reflectometry can be used to determine cable length. This conventional technique can have accuracy limitations in certain situation such as with perfectly terminated cable. A cable length can also be determined through the use of link delay measurements that are based on clock synchronization between nodes in a network. Notwithstanding the accuracy issues of these link delay measurements, overall accuracy can be increased through the combination of the two cable length delay measurements into a final estimate.

Abstract: The present invention provides a novel structure that can be used to make a common mode filter. Only the common mode will be attenuated and the differential mode will not be attenuated. This structure can be implemented in a number of ways, a specific embodiment using strip-line and slot-line junctions is very compact and well-suited to use with multilayer PCBs, and does not require any extra components. It can be designed to attenuate certain discrete frequencies, by designing the poles of the transfer function to be at these frequencies.

Abstract: A transient voltage suppressing (TVS) circuit with uni-directional blocking and symmetric bi-directional blocking capabilities integrated with an electromagnetic interference (EMI) filter supported on a semiconductor substrate of a first conductivity type. The TVS circuit integrated with the EMI filter further includes a ground terminal disposed on the surface for the symmetric bi-directional blocking structure and at the bottom of the semiconductor substrate for the uni-directional blocking structure and an input and an output terminal disposed on a top surface with at least a Zener diode and a plurality of capacitors disposed in the semiconductor substrate to couple the ground terminal to the input and output terminals with a direct capacitive coupling without an intermediate floating body region.

Abstract: A device to attenuate EMI between a source and a load is provided. The device includes a first cable to electrically couple the source and the load and a second cable positioned adjacent to the first cable and configured to attenuate a common-mode current.

Abstract: The electric multiple conductor system (1) is used for the transmission of signals in differential mode, and has two signal lines (5, 6) and a shared reference line (7). Each signal line (5, 6) includes an attenuation or filter element (13, 14) with a connection branch (15, 16), which runs between a branch node (20, 21) in the respective signal line (5, 6) and the reference line (7). The attenuation or filter elements (13, 14) of the respective signal lines (5, 6) are nominally of the same size. Each connection branch (15, 16) respectively includes a serial connection of a first partial branch (17, 18) having a first reactive impedance (23, 24) and a second partial branch (19) having a second reactive impedance (25). The second partial branch (19) is a shared component of all attenuation or filter elements (13, 14). The multiple conductor system (1) achieves a very high level of common mode suppression.

Abstract: A method and system for improving power distribution and/or current measurement on a printed circuit board is disclosed. According to the invention, a first power plane adapted for current measurement includes a first segment to which a current source is connected and a second segment to which other devices may be connected, forming the current load. A third segment is used to measure the current between the first segment and the second segment through two vias that link two points of the third segment to, preferably, two pads of the external layer. In a preferred embodiment, vias are connected to the first segment so that current flow in the third segment is linear, to improve and simplify current determination. The resistivity between the pair of vias may be computed or estimated using calibrated currents.

Abstract: A substrate for a semiconductor package comprises a dielectric substrate, a circuit pattern, and an electromagnetic band gap (EBG) pattern. The circuit pattern is formed on a first surface of the dielectric substrate and is connected to ground via a ground connection. The electromagnetic band gap (EBG) pattern comprises a plurality of zigzag unit structures formed on a second surface of the dielectric substrate, wherein the second surface is formed on an opposite side of the dielectric substrate from the first surface; the zigzag unit structures are electrically connected to each other; and at least one of the zigzag unit structures is electrically connected to the ground connection.

Abstract: The average EMR emissions of an electronic device may be reduced by implementing an electrically-active modulated termination. For example, the impedance may be continuously varied at one or more termination locations between two metal substructures to cause a like variation in the amplitude of each component of the EMR. According to one approach, cyclically varying the electrical impedance with a period of less than the time interval over which the EMR is measured will result in a reduction in the average measured EMR.

Abstract: An electromagnetic bandgap structure is disclosed. In accordance with an embodiment of the present invention, the electromagnetic bandgap structure can include a dielectric layer, a plurality of conductive plates, placed on a planar surface which is different from that of the dielectric layer, vias, of which each is connected to each of the conductive plates, respectively, and penetrates through the dielectric layer from one end part that is connected to the conductive plates, and a conductive trace, which connects the other end parts of the vias with each other such that all of the conductive plates are electrically connected.

Abstract: In order to reduce noise on twisted metallic pair signal conductors, circuits are disclosed in which the signal balance between the wires of the pair is significantly improved, thereby reducing the line's susceptibility to external electromagnetic interference and equally reducing its ability to radiate signals into the surrounding medium. Further, the common mode impedance of the wire pair as seen at or close to the junction with the terminating equipment is controlled in order to reduce the ability of signals external to the wire pair to couple into the wire. This reduces noise in the line, as perceived by connected equipment, leading to an increase in the data carrying capacity of the line and the usable length of the line carrying such data.

Abstract: An electromagnetic bandgap structure is disclosed. In accordance with an embodiment of the present invention, the electromagnetic bandgap structure that blocks a noise of a certain frequency band can include 4 or more conductive plates, a first stitching via, which electrically connects any two of the conductive plates with each other by having a part of the first stitching via pass through a planar surface that is different from a planar surface of the conductive plates, a second stitching via, which electrically connects another two of the conductive plates with each other by having a part of the second stitching via pass through a planar surface that is different from a planar surface of the conductive plates, and a stitching via chain, which electrically connects the first stitching via and the second stitching via with each other.

Abstract: A network transformer to reduce electromagnetic interference (EMI) is connected to two network equipment to transmit data. It has a transformation unit to transform input power and input information of one network equipment to output power and output information and a plurality of high frequency signal attenuation elements to receive the output power and output information and reduce high frequency noises thereof. The attenuated output information and output power are sent to the load of the other network equipment. The high frequency signal attenuation elements and the load are bridged by high frequency signal channel elements which receive high frequency signals of the output information and output power, and integrate and ground the high frequency signals. Therefore, the high frequency signals are eliminated and EMI is reduced.

Abstract: A device and method for attenuating high frequency signals on a power line carrying power is provided. In one embodiment the device may include a toroid shaped core formed of magnetically permeable material and having an inner surface to be disposed substantially around the entire circumference of the power line and a winding formed of a conductor that encircles the toroid. The conductor may include a first spiral coil comprised of a plurality of insulated loops such as concentric loops. The first coil is configured to act as an impedance to high frequency signals traversing the conductor and to allow signals below one hundred hertz to traverse the conductor substantially unimpeded to thereby prevent saturation of the core by the power carried by the power line.

Abstract: A method and apparatus to generate a common-mode reference signal. A common-mode current is received at a common-mode current sensing circuit. The common-mode current is sampled at a node between the common-mode current sensing circuit and a shunt resistor. The resulting voltage across the shunt resistor from the applied common-mode current is used as a common-mode reference signal.

Abstract: A system reduces a received RF signal from EMI generated by a digital electronic system that includes a clock. In the present invention the clock frequency, that generates signals and strobes data out, is purposely changed or modulated, by, illustratively, driving the power node of the clock. The typical filter circuit between the clock power node and the power supply is used to advantage in that the filter impedance allows a buffer to more easily drive the clock power node since the low impedance of the power supply is isolated by the filter circuit. The changing of the clock frequency spreads the EMI RF harmonics over a spectrum so that any harmonics received by an RF receiver will be short lived and therefore of small magnitude.

Abstract: A substrate for power decoupling and a method of forming a substrate for power decoupling. The substrate comprises one or more decoupling capacitors; and one or more interconnections to the decoupling capacitors. At least one of the interconnections comprises a lossy material.

Abstract: A power inserter module includes an FIC male first port for a direct connection without use of cable to a female F-type output port of a DC source of power, an F-type female second port for connection to an RF amplifier to provide DC power thereto and receive RF signals therefrom, an F-type female connector third port for delivering the RF signals to a subscriber, and an electrical circuit for both connecting DC power from the first port to the second port while blocking RF signals from the first port, and connecting RF signals from the second port to the third port while blocking DC power from the latter.

Abstract: An electro-magnetic bandgap structure is disclosed. The electro-magnetic bandgap structure in accordance with an embodiment of the present invention includes a plurality of conductive plates bridge-connected with one another on a same plane, whereas the each of the conductive plates includes an internal patch; a first ring patch be electrically separated from the internal patch and surrounding the internal patch; and a second ring patch surrounding the first ring patch and electrically connected with the first ring patch through a portion.

Abstract: In a signal transmitter for a multiple differential transmission system including a signal transmitter and a signal receiver connected via three signal lines, first and second differential drivers generate first and second output signals of bipolar four values and having a first signal voltage level, and inverted first and second output signals, responsive to first and second bit information signals. A third differential driver generates a third output signal of bipolar four values having a second signal voltage level, and an inverted third output signal, responsive to a third bit information signal. The first output signal and the inverted third output signal are combined and transmitted to the first signal line, the second output signal and the inverted first output signal are combined and transmitted to the second signal line, and the third output signal and the inverted second output signal are combined and transmitted to the third signal line.

Abstract: A signal splitter for reducing noise ingress and a cable television network incorporating such splitters. A signal splitter has an input and a plurality of outputs, where alternate outputs are connected to phase shifting devices. Prevention circuitry is provided for at least preventing the generation of intermodulation products in the phase shifting devices. The prevention circuitry is provided with a pre-connected filter in the form of a high-pass filter for stopping voltage peaks through reflection of the energy contained in the voltage peaks.

Abstract: A high frequency package in which the resonance frequency of a metal seal ring is high, a reflection loss and a insertion loss of an input terminal and an output terminal are reduced in working frequency, and which has an excellent RF (radio frequency) characteristic in such as a millimeter wave, and a manufacturing method for the same are provided. The high frequency package has a minimum of an conductor base plate, a ceramic frame, the metal seal ring arranged on the ceramic frame, a solder metal layer arranged on the metal seal ring, a resonance frequency adjustment conductor formed of a conductor having an opening arranged on the solder metal layer, and a ceramic cap arranged on the resonance frequency adjustment conductor. The resonance frequency adjustment conductor is arranged so that an opening may correspond to a high portion of a loop of bonding wire.

Abstract: A system for reducing radiated emissions the system including a microwave generator that supplies microwave energy at a fundamental frequency, a coaxial transmission cable that transmits microwave energy between the microwave generator and a microwave energy delivery device and an isolation apparatus connected between the microwave generator and the coaxial transmission cable. The isolation apparatus is configured to electrically isolate the coaxial transmission cable from the microwave generator and capacitively couple the microwave generator ground to the coaxial transmission cable.

Abstract: An isolation apparatus for reducing radiated emissions of a microwave energy delivery system including an isolation circuit board and a shield coupling, the isolation circuit board and shield coupling configured to capacitively couple a microwave generator and a coaxial transmission cable and the isolation circuit board further configured to pass energy at a fundamental frequency between the microwave generator and the coaxial transmission cable.

Abstract: A pair of signal transmission lines includes an aggressor line and a victim line parallel to the aggressor line. A plurality of time delay modules is linked in the aggressor line. A plurality of time delay modules is linked in the victim line. A total delay time of the time delay modules of the victim line is equal to a total delay time of the time delay modules of the aggressor line.

Abstract: A chip on film (COF) trace routing method for EMI reduction includes: providing a flexible circuit board; mounting a chip that has a first signal pad, a second signal pad and a ground pad on the flexible circuit board; and forming a first signal trace, a second signal trace, a first ground trace and a second ground trace on the flexible circuit board. The first signal trace and the second signal trace are electrically connected to the first signal pad and the second signal pad respectively. The first ground trace and the second ground trace are both electrically connected to the ground pad. The first signal trace and the second signal trace are disposed between the first ground trace and the second ground trace. The first ground trace and the second ground trace are immediately adjacent to the first signal trace and the second signal trace respectively.

Abstract: Methods and systems for optimal frequency planning for an integrated communication system with multiple receivers may include adjusting a center frequency of a low IF signal to reduce interference by a second order interference signal. The center frequency may be adjusted to avoid high power portions of the second order interference signal. The interference level corresponding to a center frequency may be determined by, for example, a SNR of the low IF signal, or by determining a BER for the low IF signal. The center frequency of the low IF signal may be dynamically adjusted to keep second order interference level at an acceptable level. Adjusting the center frequency of the low IF signal may also comprise keeping the low IF signal from being blocked by a DC component of the second order interference signal.

Abstract: Proposed is an apparatus for silencing electromagnetic noise, characterized by a plurality of centrally symmetrical ring-shaped through-via-hole crystalline units provided between a high voltage plane and a low voltage plane at a regular interval, thereby forming an omnidirectional noise suppression frequency band for reducing noise interference and electromagnetic radiation. In a first embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between a metal plane and the low voltage plane. In a second embodiment of the ring-shaped through-via-hole crystalline units, the through via holes are perpendicularly coupled between two metal planes. Positioned at a regular interval, the through via holes enable provision of omnidirectional noise suppression frequency band, simplified design of a power plane, and reduction of production costs.

Abstract: An electromagnetic interference eliminating apparatus includes a multi-stage filter that is composed of inductors, capacitors and resistors, and an active filter. The multi-stage filter receives an input signal and provides an eliminating band to eliminate the noise in the input signal. The active filter is connected with the multi-stage filter for buffering the input signal that has been eliminated and exactly outputting an output signal.

Abstract: The present invention relates to a transposition device for a prefabricated electrical canalization, said canalization includes a certain number of conducting bars distributing different phases including or not the neutral, the bars extending substantially parallel to one another, the transposition device being designed to reverse the position of at least two bars with respect to one another in the canalization. This device is characterized in that it is designed to be incorporated in said canalization, and includes the same number of portions of bar as the number of above-mentioned bars of the canalization, at least one of these portions of bar being interrupted inside the device so as to form two parts of portions of bars, these parts includes at their ends a fold towards the outside of said device thus forming an end part that is outwardly offset so as to increase the space between these end parts.

Abstract: Impedance mismatching points such as a VIA and a connector on a differential line between a differential driver element and a differential receiver element are arranged in predetermined positions. That is, the impedance mismatching points are arranged in such positions that a transmission time of a digital signal transmitted through a main differential line becomes (integral multiple of UI)±0.5×Trf, whereby noises are generated within the rise and fall times of a signal to be able to maintain an excellent waveform of the signal.