A modular jack connector mounted on a main printed circuit board and having a receptacle into which a modular plug of an electronic component is inserted. The connector includes a housing, a first set of contacts arranged in the housing each adapted to engage one of the contacts of the plug, a second set of contacts at least partially arranged in the housing and adapted to engaging the main printed circuit board, contact coupling circuit means for electrically coupling the first and second sets of contacts, a capacitor for providing impedance to high frequency noise and interference and a metallic shield at least partially surrounding the housing and connected to a grounding region on the main printed circuit board. In one embodiment, the capacitor is a flexible laminate assembly including first and second conductive sheet members and an intermediate insulative material. Further, the capacitor has a plurality of folded pleats including a first pleat arranged at one end of the laminate assembly and a second pleat arranged at an opposite end of the laminate assembly. The first conductive sheet member is electrically coupled at the first pleat to the contact coupling circuit means, and the second conductive sheet member is electrically coupled at the second pleat to the metallic shield to thereby ground the first set of contacts through the capacitor. The contact coupling circuit means may include toroidal coil pairs which function separately as either a differential mode filter or a common mode filter.

Modular jack connector with a flexible laminate capacitor mounted on a circuit board

A filter for a switching power supply The filter includes a common mode inductor with coil configurations allowing differential mode current from a dc source to pass through but attenuating common mode noise from the power supply so that the noise does not reach the dc source The invention also includes the use of feed through capacitors at the switching power supply input terminals to provide further high-frequency noise attenuation

/pdf/switching-power-supply-filter-45erho42ep.pdf

Switching power supply filter

An apparatus and a method for cancelling distortion in a direct conversion receiver, such distortion created by the mixing of the desired signal with the output signal of an local oscillator. Subsequent to filtering the mixer output signal, the even mode distortion component is extracted, phase shifted, amplified and recombined with the mixed signal in such manner as to suppress even order distortion.

Apparatus with distortion cancelling feed forward signal

A semiconductor integrated circuit device includes a semiconductor substrate including a digital circuit area (13) and an analog circuit area (12) that is divided into an active element area (12a) disposed away from the digital circuit area and a passive element area (12b,c) disposed adjacent to the digital circuit area; a first well (21) having a first conductivity type that is different from a second conductivity type of the semiconductor substrate (20) and formed in a part of the semiconductor substrate corresponding to the passive element area; a second well (22) having the second conductivity type and formed in the first well; a device isolation film (23) formed on the second well; a digital circuit formed in the digital circuit area; an active element implemented by an analog circuit and formed in the active element area; and a passive element (25,26) implemented by an analog circuit and formed on the device isolation film in the passive element area.

Semiconductor integrated circuit device

The present invention relates to a single phase, non-insulated, miniaturized DC/AC power inverter having an output power density higher than 3000 W/dm³, wherein said power inverter is packaged in a casing made of an external electrically conductive enclosure containing a fan blowing in an axial direction to a side face of the casing and, in a stacked elevation arrangement, successively from a bottom side to a top side, a layer of active filter capacitors, a heatsink, a layer of wideband semiconductors switches connected to a PCB with thermal vias and a layer of active filtering inductors, the fan and the component stacked arrangement being designed so as, in operation, the external temperature of the casing does not overcome 60°C in any point, for an ambient temperature of maximum 30°C under a maximum load of 2 kVA.

High power density inverter (ii)

A two line power filter for digital equipment or the like comprising a pair of toroidal cores on both of which both wires are wound, on one in flux adding relationship and on the other in flux opposing or cancelling relationship in reference to the primary power supply, together with capacitive shunts between the wires and from the wires to ground to filter out both common mode and differential mode noise.

Werner E. Neuman

Papers

Noise suppression filter