Abstract:
A T-shaped gate structure and method for forming the same the method including providing a semiconductor substrate comprising at least one overlying sacrificial layer; lithographically patterning a resist layer overlying the at least one sacrificial layer for etching an opening; forming the etched opening through a thickness of the at least one sacrificial layer to expose the semiconductor substrate, said etched opening comprising a tapered cross section having a wider upper portion compared to a bottom portion; and, backfilling the etched opening with a gate electrode material to form a gate structure.
Abstract:
A T-shaped gate structure and method for forming the same the method including providing a semiconductor substrate comprising at least one overlying sacrificial layer; lithographically patterning a resist layer overlying the at least one sacrificial layer for etching an opening; forming the etched opening through a thickness of the at least one sacrificial layer to expose the semiconductor substrate, said etched opening comprising a tapered cross section having a wider upper portion compared to a bottom portion; and, backfilling the etched opening with a gate electrode material to form a gate structure.
Abstract:
A method for forming stacked capacitors for DRAMs using a single photoresist mask and having bottom electrodes self-aligned to node contacts is achieved. A planar silicon oxide (SiO.sub.2) first insulating layer is formed over device areas. A first silicon nitride (Si.sub.3 N.sub.4) hard mask layer is deposited and a second insulating layer is deposited. First openings are etched, partially into the first insulating layer, for the capacitor bottom electrodes. A second Si.sub.3 N.sub.4 layer is deposited and etched back to form sidewall spacers in the first openings. The Si.sub.3 N.sub.4 hard mask and spacers are used to etch second openings (node contacts) in the first insulating layer, self-aligned in the first openings and to the source/drain contact areas. A first polysilicon layer is deposited and etched back to form recessed polysilicon plugs in the first openings. A third Si.sub.3 N.sub.4 layer is deposited and etched back to form sidewall spacers on the plugs in the first openings and is used as a mask to etch the polysilicon to form the vertical sidewalls of the bottom electrodes self-aligned to the node contacts. The first insulating layer is recessed to expose the bottom electrodes. An interelectrode dielectric layer is formed on the bottom electrodes, and a patterned second polysilicon layer is used for the top electrodes.
Abstract translation:实现了使用单个光致抗蚀剂掩模形成用于DRAM的堆叠电容器并且具有与节点接触自对准的底部电极的方法。 在器件区域上形成平面氧化硅(SiO 2)第一绝缘层。 沉积第一氮化硅(Si 3 N 4)硬掩模层并沉积第二绝缘层。 对于电容器底部电极,第一开口部分地被蚀刻到第一绝缘层中。 第二Si 3 N 4层被沉积并回蚀刻以在第一开口中形成侧壁间隔物。 Si 3 N 4硬掩模和间隔物用于蚀刻第一绝缘层中的第二开口(节点接触),在第一开口中和源/漏接触区域中自对准。 沉积第一多晶硅层并将其回蚀刻以在第一开口中形成凹陷的多晶硅塞。 沉积第三个Si 3 N 4层并回蚀刻以在第一开口中的插塞上形成侧壁间隔物,并且用作掩模以蚀刻多晶硅以形成与节点接触件自对准的底部电极的垂直侧壁。 第一绝缘层凹进露出底部电极。 在底部电极上形成电极间电介质层,并且将图案化的第二多晶硅层用于顶部电极。
Abstract:
An integrated circuit includes a first diffusion area for a first type transistor. The first type transistor includes a first drain region and a first source region. A second diffusion area for a second type transistor is separated from the first diffusion area. The second type transistor includes a second drain region and a second source region. A gate electrode continuously extends across the first diffusion area and the second diffusion area in a routing direction. A first metallic structure is electrically coupled with the first source region. A second metallic structure is electrically coupled with the second drain region. A third metallic structure is disposed over and electrically coupled with the first and second metallic structures. A width of the first metallic structure is substantially equal to or larger than a width of the third metallic structure.
Abstract:
A frequency jitter generator and a frequency jitter PWM controller are provided for overcoming the shortcoming that a conventional PWM controller reduces the electromagnetic interference issue by means of varying the operating frequency of the PWM controller based on an input voltage, while resulting in the uncertainty of the range of frequency jitter and the difficulty circuit design due to the effect of the input voltage and the load. The frequency jitter generator and PWM controller adjust the range of frequency jitter by using a signal within a fixed voltage range. The invention not only gets rid of the effect of the input voltage and the loading, but also simplifies the circuit design by fixing the range of frequency jitter no greater than a predetermined percentage regardless of the operating frequency of the PWM controller.
Abstract:
A method to reduce the inverse narrow width effect in NMOS transistors is described. An oxide liner is deposited in a shallow trench that is formed to isolate active areas in a substrate. A photoresist plug is formed in the shallow trench and is recessed below the top of the substrate to expose the top portion of the oxide liner. An angled indium implant through the oxide liner into the substrate is then performed. The plug is removed and an insulator is deposited to fill the trenches. After planarization and wet etch steps, formation of a gate dielectric layer and a patterned gate layer, the NMOS transistor exhibits an improved Vt roll-off of 40 to 45 mVolts for both long and short channels. The improvement is achieved with no degradation in junction or isolation performance. The indium implant dose and angle may be varied to provide flexibility to the process.
Abstract:
A method and an architecture for accessing hardware devices in a computer system and the chipset thereof are provided. A bi-directional two-wired serial interface, for instance, a system management bus (SMB), is configured to connect an I/O device, such as a local area network adapter, to a system controller such as a southbridge or a northbridge chipset. The I/O device which includes a SMB master controller serves as a SMB master device for generating a clock signal and transmitting a data signal defined by the SMB protocol to the system controller according to the clock signal. The system controller which includes a PCI master and a SMB slave controller serves as a SMB slave device for receiving commands and data bytes in the data signal from the SMB master device to drive the PCI master to access the register block of peripherals and system memory of the computer system.
Abstract:
Dynamic Random Access Memory (DRAM) cells are formed in a P well formed in a biased deep N well (DNW). PMOS transistors are formed in N wells. The NMOS channels stop implant mask is modified not to be a reverse of the N well mask in order to block the channels stop implant from an N+ contact region used for DNW biasing. In DRAMs and other integrated circuits, a minimal spacing requirement between a well of an integrated circuit on the one hand and adjacent circuitry on the other hand is eliminated by laying out the adjacent circuitry so that the well is located adjacent to a transistor having an electrode connected to the same voltage as the voltage that biases the well. For example, in DRAMs, the minimal spacing requirement between the DNW and the read/write circuitry is eliminated by locating the DNW next to a transistor precharging the bit lines before memory accesses. One electrode of the transistor is connected to a precharge voltage. This electrode overlaps the DNW which is biased to the same precharge voltage. This electrode provides the DNW N+ contact region.
Abstract:
An MOSFET device is fabricated with a plurality of conductors capacitively coupled to a first electrode, forming a mask on the surface of the first electrode exposing a predetermined zone of the first electrode, doping the first electrode through the mask, removing the mask from the surface of the first electrode, oxidizing the first electrode to form a layer of oxide over the first electrode with a thicker layer of oxide over the predetermined zone and a thinner layer of oxide elsewhere, forming at least one electrode over the first electrode on the thinner layer of oxide outside of the zone and forming at least one other electrode over the first electrode on the thicker layer of oxide inside the zone, whereby the one electrode and the other electrode have substantially different capacitive coupling to the electrode.
Abstract:
A transistor includes a notched fin covered under a shallow trench isolation layer. One or more notch may be used, the size of which may vary along a lateral direction of the fin. In some embodiments, The notch is formed using anisotropic wet etching that is selective according to silicon orientation. Example wet etchants are tetramethylammonium hydroxide (TMAH) or potassium hydroxide (KOH).