Lenovo (singapore) Pte. Ltd.

International Business Machines Corporation

Donald Richard Dignam

Jian Meng

Stephen John Flint

Eric Rong Ao

Alexander Philip Campbell

Rong Eric Ao

Georges Turcotte

Christian Savard

Fred Roberts

Georges Pierre Turcotte

A device, according to one embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith. A hybrid device, according to another embodiment, includes a fuse, and a resistor electrically coupled directly to the fuse in series therewith in a single package. A resistance of the resistor is 1 ohm or less, and is substantially temperature insensitive.

Resistor and fuse overcurrent protection device

A differential transmission line includes a positive conductor on which a positive complementary component of a differential signal is transmitted, and a negative conductor parallel to the positive conductor on which a negative complementary component of the differential signal is transmitted. A quarter wavelength differential coupler is inserted along a length of the positive and negative conductors. The quarter wavelength differential coupler has a length corresponding to a frequency of common mode noise on the positive and negative conductors. The quarter wavelength differential coupler reduces the common mode noise at the frequency as the differential signal passes through the quarter wavelength differential coupler.

Differential transmission line having quarter wavelength differential coupler to reduce common mode noise

A high bandwidth signal probe device and a method of probing a high bandwidth signal are provided. The high bandwidth signal probe device includes a probe tip for probing a stub of a backdrilled via of a printed circuit board. The probe tip is adapted to fit in the backdrilled via. The probe tip has a length adapted to reach the stub of the backdrilled via. The probe tip is adapted to contact a plated portion of the stub of the backdrilled via. A resistive element is associated with the probe tip. The method includes inserting a probe tip of a signal probe device in the backdrilled via, placing the probe tip in contact with a plated portion of the stub of the backdrilled via, and receiving an electrical signal through a path which includes a resistive element of the probe tip of the signal probe device.

High bandwidth signal probe tip

An optical element conveying human-discernible information to a user has its brightness modulated to also convey machine-discernible information to an optical detector. A frame section in which a bit of data can be conveyed begins at a falling edge of a preceding frame section corresponding to the brightness of the optical element decreasing to a low level. At a first predetermined point within the frame section, if the bit of data is logic one, the brightness is increased to a high level, corresponding to a rising edge. At a later, second predetermined point within the frame section, if the bit of data is logic zero, the brightness is increased to the high level, corresponding to the rising edge. At the end of the frame section, the brightness is decreased to the low level, corresponding to a falling edge of the frame section.

Modulating brightness of optical element conveying human-discernible information to also convey machine-discernible information

A differential transmission line with a common mode notch filter includes adjacently arranged, repeating differential transmission line pair sections. The sections have lengths that are each equal to half of an electric wavelength of a lowest frequency of a common mode electromagnetic wave to be suppressed during transmission of an electric signal over the differential transmission line. Each section includes a pair of conductors separated from one another by a spacing. The width of each conductor and the spacing between the conductors of each section vary over the length thereof according to a same pattern such that at every point over the length of each section a differential mode impedance of the differential transmission line is identical. A common mode impedance of the differential transmission line changes periodically in accordance with the lengths of the sections.

Differential transmission line with common mode notch filter

Embodiments of the present invention provide for a transmission line stub that includes a via stub of a conductive via. The conductive via includes a via stub and a coupling element, wherein a first transmission line configured to transmit a signal is coupled to the conductive via at the intersection of the via stub and the coupling element. The coupling element is configured to transmit the signal from the first transmission line. A line stub electrically coupled to the via stub, wherein the length of the line stub is selected such that the transmission line stub having a length of the sum of the lengths of the via stub and the line stub is configured to suppress a preselected frequency.

Reduced backdrilling with quarter wavelength transmission line stubs

Embodiments of the present invention provide for a transmission circuit that includes a transmission line and a conductive via. The transmission line is electrically coupled to a first conductive via and a second conductive via. The first conductive via includes a first via stub, wherein the transmission line is configured to transmit a signal that is coupled to the first conductive via, and wherein the first via stub extends beyond the transmission line. The second conductive via includes a second via stub, wherein the transmission line is configured to transmit a signal that is coupled to the second conductive via, and wherein the second via stub extends beyond the transmission line. A transmission line stub is electrically coupled to the transmission line or to at least one of the conductive vias, wherein the length of the transmission line stub is configured to suppress a preselected frequency.

Growing community of inventors

Ottawa, Canada

Donald Richard Dignam