摘要:
The present invention provides a semiconductor structure including a buried resistor with improved control, in which the resistor is fabricated in a region of a semiconductor substrate beneath a well region that is also present in the substrate. In accordance with the present invention, the inventive structure includes a semiconductor substrate containing at least a well region; and a buried resistor located in a region of the semiconductor substrate that is beneath said well region. The present invention also provides a method of fabricating such a structure in which a deep ion implantation process is used to form the buried resistor and a shallower ion implantation process is used in forming the well region.
摘要:
Various methods of fabricating a high precision, silicon-containing resistor in which the resistor is formed as a discrete device integrated in complementary metal oxide semiconductor (CMOS) processing utilizing low temperature silicidation are provided. In some embodiments, the Si-containing layer is implanted with a high dose of ions prior to activation. The activation can be performed by the deposition of a protective dielectric layer, or a separate activation anneal. In another embodiment, a highly doped in-situ Si-containing layer is used thus eliminating the need for implanting into the Si-containing layer.
摘要:
A method of fabricating a buried subcollector in which the buried subcollector is implanted to a depth in which during subsequent epi growth the buried subcollector remains substantially below the fictitious interface between the epi layer and the substrate is provided. In particular, the inventive method forms a buried subcollector having an upper surface (i.e., junction) that is located at a depth from about 3000 Å or greater from the upper surface of the semiconductor substrate. This deep buried subcollector having an upper surface that is located at a depth from about 3000 Å or greater from the upper surface of the substrate is formed using a reduced implant energy (as compared to a standard deep implanted subcollector process) at a relative high dose. The present invention also provides a semiconductor structure including the inventive buried subcollector which can be used as cathode for passive devices in high frequency applications.
摘要:
A method of forming a semiconductor structure, and the semiconductor structure so formed, wherein a transmission line, such as an inductor, is formed on a planar level above the surface of a last metal wiring level.
摘要:
A method for fabricating high gain FETs that substantially reduces or eliminates unwanted variation in device characteristics caused by using a prior art shadow masking process is provided. The inventive method employs a blocking mask that at least partially extends over the gate region wherein after extension and halo implants an FET having an asymmetric halo region asymmetric extension regions or a combination thereof is fabricated. The inventive method thus provides high gain FETs in which the variation of device characteristics is substantially reduced. The present invention also relates to the resulting asymmetric high gain FET device that is fabricated utilizing the method of the present invention.
摘要:
A structure comprises a single wafer with a first subcollector formed in a first region having a first thickness and a second subcollector formed in a second region having a second thickness, different from the first thickness. A method is also contemplated which includes providing a substrate including a first layer and forming a first doped region in the first layer. The method further includes forming a second layer on the first layer and forming a second doped region in the second layer. The second doped region is formed at a different depth than the first doped region. The method also includes forming a first reachthrough in the first layer and forming a second reachthrough in second layer to link the first reachthrough to the surface.
摘要:
A semiconductor structure comprising a hyperabrupt junction varactor with a compensated cathode contact as well as a method of fabricating the same are disclosed. The method includes a single implant mask which is used in forming the subcollector/cathode, collector/well and hyperabrupt junction.
摘要:
Tunable TCR resistors incorporated into integrated circuits and a method fabricating the tunable TCR resistors. The tunable TCR resistors including two or more resistors of two or more different materials having opposite polarity and different magnitude TCRs, the same polarity and different magnitude TCRs or having opposite polarity and about the same TCRs.
摘要:
The present invention provides a varactor that has increased tunability and a high quality factor Q as well as a method of fabricating the varactor. The method of the present invention can be integrated into a conventional CMOS processing scheme or into a conventional BiCMOS processing scheme. The method includes providing a structure that includes a semiconductor substrate of a first conductivity type and optionally a subcollector or isolation well (i.e., doped region) of a second conductivity type located below an upper region of the substrate, the first conductivity type is different from said second conductivity type. Next, a plurality of isolation regions are formed in the upper region of the substrate and then a well region is formed in the upper region of the substrate. In some cases, the doped region is formed at this point of the inventive process. The well region includes outer well regions of the second conductivity type and an inner well region of the first conductivity type. Each well of said well region is separated at an upper surface by an isolation region. A field effect transistor having at least a gate conductor of the first conductivity type is then formed above the inner well region.
摘要:
A structure for resistors and the method for tuning the same. The resistor comprises an electrically conducting region coupled to a liner region. Both the electrically conducting region and the liner region are electrically coupled to first and second contact regions. A voltage difference is applied between the first and second contact regions. As a result, a current flows between the first and second contact regions in the electrically conducting region. The voltage difference and the materials of the electrically conducting region and the liner region are such that electromigration occurs only in the electrically conducting region. As a result, a void region within the electrically conducting region expands in the direction of the flow of the charged particles constituting the current. Because the resistor loses a conducting portion of the electrically conducting region to the void region, the resistance of the resistor is increased (i.e., tuned).