Motorola Corporation

Semiconductor Components Industries, LLC

John Bliss

Stephen P Robb

Samuel Anderson

David M Susak

Karl W Wyatt

Dennis L Welty

Jang-Hun (James) Yeh

Austin Vincent Harton

Judith L Sutor

Lloyd H Hayes

Lynn William Ford

A variable capacitance semiconductor device (,) such as a varactor diode, is formed to have a plurality of openings (,), such as a plurality of trenches, that cause the depletion regions (,) to overlap. This overlap results in a rapid change of capacitance for a given change of voltage, and allows efficient operation over a small voltage range.

Method of manufacturing a capacitance semi-conductor device

A multi-directional optocoupler includes an assembly substrate (11), an emitter (20) coupled to a first region of the assembly substrate (11), a different emitter (21) coupled to a second region of the assembly substrate (11), a detector (23) coupled to a third region of the assembly substrate (11), a different detector (22) coupled to a fourth region of the assembly substrate (11), a light transmissive region (24) coupling the emitter (20) and the detector (23) wherein the emitter (20) and the detector (23) are configured to transmit and receive a first signal in a direction (26), and a different light transmissive region (25) coupling the different emitter (21) and the different detector (22) wherein the different emitter (21) and the different detector (22) are configured to transmit and receive a second signal in a different direction (27).

Multi-directional optocoupler and method of manufacture

An optical isolator (10) includes an opto-electronic emitter (16) and an opto-electronic detector (17) mounted over offset portions (12, 13) of a leadframe (11). The offset portions (12, 13) form angles (14, 15) with other portions (24, 25) of the leadframe (11). An optically transmissive material (22) encapsulates the opto-electronic emitter (16) and the opto-electronic detector (17), and a reflective material (20) is located above the opto-electronic emitter (16) and the opto-electronic detector (17). An optically insulative packaging material (26) encapsulates the optically transmissive material (22).

Optical isolator having leadframe with non-planar mounting portions

A transient protection circuit provides protection from high voltage transients appearing along a transmission line by sensing a predetermined threshold of the voltage developed thereon and opening the conduction path through first and second switching circuits in the transmission line. The switching circuits are implemented with first and second serially coupled transistors sharing a common drain and enabled by a control signal during normal operation. The first and second transistors each have a diode oriented to conduct from the source to the drain for bi-directional operation. During high voltage transient conditions, a sensing circuit detect a predetermined threshold of the potential on the transmission line and disables one of the first and second transistors which opens the conduction path through the first and second switching circuits thereby suppressing the surge currents flowing therethrough.

Transient protection circuit using common drain field effect transistors

Growing community of inventors

Tempe, AZ, United States of America

John Bliss