Abstract: A method for fabricating a semiconductor device which protects the ohmic metal contacts and the channel of the device during subsequent high temperature processing steps is explained. An encapsulation layer is used to cover the channel and ohmic metal contacts. The present invention provides a substrate on which a plurality of semiconductor layers are deposited. The semiconductor layers act as the channel of the device. The semiconductor layers are covered with an encapsulation layer. A portion of the encapsulation layer and the plurality of semiconductor layers are removed, wherein ohmic metal contacts are deposited. The ohmic metal contacts are then annealed to help reduce their resistance. The encapsulation layer ensures that the ohmic metal contacts do not migrate during the annealing step and that the channel is not harmed by the high temperatures needed during the annealing step.

Abstract: A method and apparatus for depositing self-aligned base contacts where over-etching the emitter sidewall to undercut the emitter contact is not needed. A semiconductor structure has a T-shaped emitter contact that comprises a T-top and T-foot. The T-top acts as a mask for depositing the base contacts. In forming the T-top, its dimensions may be varied, thereby allowing the spacing between the base contacts and emitter to be adjusted.

Abstract: A process and related product in which ohmic contacts are formed in High Electron Mobility Transistors (HEMTs) employing compound substrates such as gallium nitride. An improved device and an improvement to a process for fabrication of ohmic contacts to GaN/AlGaN HEMTs using a novel two step resist process to fabricate the ohmic contacts are described. This novel two-step process consists of depositing a plurality of layers having compounds of Group III V elements on a substrate; patterning and depositing a first photoresist on one of the layers; etching recessed areas into this layer; depositing ohmic metals on the recessed areas; removing the first photoresist; patterning and depositing a second photoresist, smaller in profile than the first photoresist, on the layer; depositing more ohmic metal on the layer allowing for complete coverage of the recessed areas; removing the second photoresist, and annealing the semiconductor structure.

Abstract: The present invention provides a GaN based DHFET that helps confine the 2DEG to the channel layer, and reduces the 2DHG. The present invention provides a GaN DHFET having a channel layer comprising GaN and a buffer layer comprising AlxGa1-xN. The Al content in the buffer layer is specifically chosen based on the thickness of the channel layer using a graph. By choosing the Al content in the buffer layer and thickness of the channel layer in accordance with the graph provided in the present invention, the ability of the buffer layer to help confine the 2DEG to the channel layer is improved.

Abstract: Methods, systems, and arrangements enable a mobile equipment (ME) to provide notification when a preselected number is called. In accordance with certain embodiments, upon the calling of a preselected number, the ME sends a notification to the network in addition to setting up a voice call to the dialed number. Preselected number(s) may include emergency numbers (e.g., “911”), portal-defined numbers, etc. The notification may include dialed digits, time of call, and/or location information originating from the ME. When location information is included with the notification, the location information may be forwarded to the portal for further processing and possible additional transmission. Also, location information from the notification can reduce response time and signaling capacity usage when the network responds to an inquiry regarding location from an emergency service provider.

Abstract: Methods, systems, and arrangements facilitate information interexchange between a telecommunications network and an information service provider. For example, a business-to-business (B2B) engine includes one or more logic modules for interfacing with the telecommunications network and with the information service provider. The B2B engine facilitates the reporting of, e.g., realtime information from the telecommunications network to the information service provider. This realtime information may include subscriber unit location that is proactively sent by the subscriber unit to the B2B engine for forwarding to the information service provider. To avoid possibly congesting the telecommunications network, the B2B engine is empowered to monitor the number of proactively-transmitted location messages and to limit them if they exceed a defined threshold.

Abstract: A method for fabricating a semiconductor device which protects the ohmic metal contacts and the channel of the device during subsequent high temperature processing steps is explained. An encapsulation layer is used to cover the channel and ohmic metal contacts. The present invention provides a substrate on which a plurality of semiconductor layers are deposited. The semiconductor layers act as the channel of the device. The semiconductor layers are covered with an encapsulation layer. A portion of the encapsulation layer and the plurality of semiconductor layers are removed, wherein ohmic metal contacts are deposited. The ohmic metal contacts are then annealed to help reduce their resistance. The encapsulation layer ensures that the ohmic metal contacts do not migrate during the annealing step and that the channel is not harmed by the high temperatures needed during the annealing step.

Abstract: A method is provided for improving edge terminations in a semiconductor device while maintaining breakdown voltage of said semiconductor device at or near its theoretical limit. The method comprises: employing ion-implantation to create a compensated region around the semiconductor device, followed by wet chemical etching to form a mesa on the order of 0.2 to 0.3 &mgr;m. The method provides a simple but novel approach to fabricate edge terminations in semiconductor devices in general and in devices employing p-n junctions such as in a GaAs heterojunction bipolar transistor (HBT) to achieve near-ideal electrical characteristics at the device edge. Instead of traditional edge beveling techniques such as those involving grinding, sandblasting, or mesa-etching using masks, the technique disclosed herein utilizes ion-implantation to create a compensated region around the device and wet chemical etching to make a shallow mesa.

Abstract: A process and related product in which ohmic contacts are formed in High Electron Mobility Transistors (HEMTs) employing compound substrates such as gallium nitride. An improved device and an improvement to a process for fabrication of ohmic contacts to GaN/AlGaN HEMTs using a novel two step resist process to fabricate the ohmic contacts are described. This novel two-step process consists of depositing a plurality of layers having compounds of Group III V elements on a substrate; patterning and depositing a first photoresist on one of the layers; etching recessed areas into this layer; depositing ohmic metals on the recessed areas; removing the first photoresist; patterning and depositing a second photoresist, smaller in profile than the first photoresist, on the layer; depositing more ohmic metal on the layer allowing for complete coverage of the recessed areas; removing the second photoresist, and annealing the semiconductor structure.

Abstract: A method for fabricating heterojunction field effect transistors (HFET) and a family of HFET layer structures are presented. In the method, a step of depositing a HFET semiconductor structure onto a substrate is performed. Next, a photoresist material is deposited. Portions of the photoresist material are removed corresponding to source and drain pad pairs. A metal layer is deposited onto the structure, forming source pad and drain pad pairs. The photoresist material is removed, exposing the structure in areas other than the source and drain pad pairs. Each source and drain pad pair has a corresponding exposed area. The structure is annealed and devices are electrically isolated. The exposed area of each device is etched to form a gate recess and a gate structure is formed in the recess. Semiconductor layer structures for GaN/AlGaN HFETs are also presented.

Abstract: A method is provided for improving edge terminations in a semiconductor device while maintaining breakdown voltage of said semiconductor device at or near its theoretical limit. The method comprises: employing ion-implantation to create a compensated region around the semiconductor device, followed by wet chemical etching to form a mesa on the order of 0.2 to 0.3 &mgr;m. The method provides a simple but novel approach to fabricate edge terminations in semiconductor devices in general and in devices employing p-n junctions such as in a GaAs heterojunction bipolar transistor (HBT) to achieve near-ideal electrical characteristics at the device edge. Instead of traditional edge beveling techniques such as those involving grinding, sandblasting, or mesa-etching using masks, the technique disclosed herein utilizes ion-implantation to create a compensated region around the device and wet chemical etching to make a shallow mesa.

Abstract: A telecommunications system and method is disclosed for allowing business indoor mobile subscribers having multiple profiles to access both the business indoor network and the Public Land Mobile Network (PLMN) using one mobile terminal. To implement this dual-network service, a toggle feature can be provided to allow a business indoor mobile subscriber to choose between different subscriber profiles. Thus, if a mobile subscriber currently has the business indoor profile active and wishes to access the PLMN while roaming outside the business indoor cell(s), the mobile subscriber can initiate this toggle feature, and upon acknowledgment and authentication by the PLMN, the mobile subscriber can have access to the PLMN.

Abstract: A system, method, and apparatus for facilitating information interexchange between a telecommunications network serving a wireless communications device and an information service provider. A Business-to-Business (B2B) engine polls a telecommunications node associated with the telecommunications network serving the wireless communications device for real-time information. The telecommunications node responds by transmitting the requested real-time information to the B2B engine, which, in turn, provides the received real-time information to the information service provider. The information service provider, in turn, provides a service, tailored according to the real-time information received, to a subscriber associated with the wireless communications device.

Abstract: A system and method for efficiently utilizing the radio interface in a mobile station positioning capable mobile communications network. A maximum period of mobile station positioning inactivity is allowed after which any system resources, such as semi-permanently allocated control channels, may be deallocated, thereby allowing the control channel or like resource to be utilized for other Switching System/Base Station System communications.

Abstract: A telecommunications system and method is disclosed for allowing an ongoing Time of Arrival (TOA) based positioning of a mobile station to proceed if a radio related handover has occurred before the expiration of a delta timer in a Base Station Controller (BSC). The BSC stores an HOTIMER value therein, which corresponds to the amount of time involved in a normal radio-related handover procedure from the sending of a Handover Command to the reception of a Handover Complete message. If the BSC delta timer is active, e.g., positioning is ongoing, and the BSC determines that a radio related handover is needed, the BSC checks the amount of time remaining in the BSC delta timer. If that amount is more than the HOTIMER, then the ongoing positioning is not canceled.

Abstract: Methods, systems, and arrangements facilitate information interexchange between a telecommunications network and an information service provider. For example, a business-to-business (B2B) engine includes one or more logic modules for interfacing with the telecommunications network and with the information service provider. The B2B engine facilitates the reporting of, e.g., realtime information from the telecommunications network to the information service provider. This realtime information may include subscriber unit location that is proactively sent by the subscriber unit to the B2B engine for forwarding to the information service provider. To avoid possibly congesting the telecommunications network, the B2B engine is empowered to monitor the number of proactively-transmitted location messages and to limit them if they exceed a defined threshold.

Abstract: Methods, systems, and arrangements enable a mobile equipment (ME) to provide notification when a preselected number is called. In accordance with certain embodiments, upon the calling of a preselected number, the ME sends a notification to the network in addition to setting up a voice call to the dialed number. Preselected number(s) may include emergency numbers (e.g., “911”), portal-defined numbers, etc. The notification may include dialed digits, time of call, and/or location information originating from the ME. When location information is included with the notification, the location information may be forwarded to the portal for further processing and possible additional transmission. Also, location information from the notification can reduce response time and signaling capacity usage when the network responds to an inquiry regarding location from an emergency service provider.

Abstract: A system, method, and apparatus for facilitating information interexchange between a telecommunications network serving a wireless communications device and an information service provider. The telecommunications network includes at least one node that monitors realtime information associated with a telecommunications device within the telecommunications network. The node reports the realtime information associated with the telecommunications device to a Business-to-Business (B2B) engine, which, upon receiving the realtime information, forwards the realtime information to the information service provider. The information service provider, in turn, provides a service to a subscriber associated with the telecommunications device.

Abstract: A system and apparatus for facilitating the provision of realtime information to a Business-to-Business (B2B) engine by a telecommunications device within a telecommunications system. The telecommunications device, including a Subscriber Identification Module (SIM) card and an application unit therein, transmits the realtime information to the B2B engine. In a feature of the present invention, the application unit, being in communication with the SIM card, gathers and constructs a message containing the realtime information and transmits the realtime information to the B2B engine. Upon receipt of the realtime information, the B2B engine forwards the realtime information to an information service provider, which, in turn, provides content data/services to the telecommunications device.

Abstract: Methods, systems, and arrangements facilitate information interexchange between a telecommunications network and an information service provider (InfSP). For example, a business-to-business (B2B) engine includes one or more logic modules for interfacing with the telecommunications network and with the InfSP. The B2B engine facilitates the reporting of, e.g., realtime information from the telecommunications network to the InfSP. This realtime information may include subscriber unit location and may be acquired and/or reported based on a mapping data structure in, e.g., the B2B engine. The data structure maps a service class to one or more parameters that dictate or provide guidance with respect to which parameters are relevant, as well as their respective values, and a mechanism for achieving the stipulated parameters. The mechanism may include specific network nodes/entities as well as frequency of acquisition to thereby enable location-tailored content data and/or services to be provided to a subscriber.