Protek Devices LP

Venkatesh Panemangalore Pai

Donald K Cartmell

Fred Matteson

Mohammad Rehman

Umesh Jayamohan

A click-noise suppression system having MOSFET transistor switches positioned between the preamplifiers and coupling capacitors of an audio system wherein the suppression system maintains the switches off when the system is turned on until a charging circuit increases the gate voltage of the switches. The switches quickly turn off and the coupling capacitors are discharged through discharge resistors when the system is turned off.

Click-pop noise suppression system

A bi-directional transient voltage suppression ('TVS') device () includes a semiconductor die () that has a first avalanche diode () in series with a first rectifier diode () connected cathode to cathode, electrically coupled in an anti-parallel configuration with a second avalanche diode () in series with a second rectifier diode () also connected cathode to cathode. All the diodes of the TVS device are on a single semiconductor substrate (). The die has a low resistivity buried diffused layer () having a first conductivity type disposed between a semiconductor substrate () having the opposite conductivity type and a high resistivity epitaxial layer () having the first conductivity type. The buried diffused layer shunts most of a transient current away from a portion of the epitaxial layer between the first avalanche diode and the first rectifier diode, thereby reducing the clamping voltage relative to the breakdown voltage. The TVS device is packaged as a flip chip () that has four solder bump pads (-). The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims pursuant to 37 C.F.R. &#xa7;1.72().

Transient voltage suppression device

A bi-directional transient voltage suppression ('TVS') device () includes a semiconductor die () that has a first avalanche diode () in series with a first rectifier diode () connected cathode to cathode, electrically coupled in an anti-parallel configuration with a second avalanche diode () in series with a second rectifier diode () also connected cathode to cathode. All the diodes of the TVS device are on a single semiconductor substrate (). The die has a low resistivity buried diffused layer () having a first conductivity type disposed between a semiconductor substrate () having the opposite conductivity type and a high resistivity epitaxial layer () having the first conductivity type. The buried diffused layer shunts most of a transient current away from a portion of the epitaxial layer between the first avalanche diode and the first rectifier diode, thereby reducing the clamping voltage relative to the breakdown voltage. The TVS device is packaged as a flip chip () that has four solder bump pads (-). The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims pursuant to 37 C.F.R. &#xa7;1.72(b).

A bi-directional transient voltage suppression ('TVS') device () includes a semiconductor die () that has a first avalanche diode () in series with a first rectifier diode () connected cathode to cathode, electrically coupled in an anti-parallel configuration with a second avalanche diode () in series with a second rectifier diode () also connected cathode to cathode. All the diodes of the TVS device are on a single semiconductor substrate (). The die has a low resistivity buried diffused layer () having a first conductivity type disposed between a semiconductor substrate () having the opposite conductivity type and a high resistivity epitaxial layer () having the first conductivity type. The buried diffused layer shunts most of a transient current away from a portion of the epitaxial layer between the first avalanche diode and the first rectifier diode, thereby reducing the clamping voltage relative to the breakdown voltage. The TVS device is packaged as a flip chip () that has four solder bump pads (). The abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims pursuant to 37 C.F.R. &#xa7;1.72().

Growing community of inventors

Gilbert, AZ, United States of America

Venkatesh Panemangalore Pai