摘要:
A counter-doped epitaxial silicon (doped opposite to the substrate type) is used to form the buried layer in a CMOS transistor, while maintaining an abrupt channel profile. Shallow source/drain junctions with abrupt source/drain profiles may be formed using raised (or elevated) source/drain design. The invention encompasses a transistor structure including a doped silicon substrate, and an oppositely-doped epitaxial silicon layer formed on the substrate. A gate is formed on the epitaxial layer, the gate defining a channel region in the epitaxial layer underneath the gate. A layer is formed on the epitaxial silicon layer on opposing sides of, and is electrically isolated from, the gate.
摘要:
A pass transistor for a 1-transistor dynammic random access memory (DRAM) integrated circuit with a square root relation between threshold adjustment dose and substrate bias.
摘要:
A new semiconductor controlled rectifier which may be used to provide on-chip protection against ESD stress applied at the input, output, power supply pins or between any arbitrary pair of pins of an integrated circuit is disclosed. The structure which has the lowest breakdown voltage for a given technology is incorporated into the SCR enabling a SCR trigger voltage determined by the lowest breakdown-structure.
摘要:
A programmable device (10) is formed from a silicided MOS transistor. The transistor (10) is formed at a face of a semiconductor layer (12), and includes a diffused drain region (17, 22) and a source region (19, 24) that are spaced apart by a channel region (26). At least the drain region (22) has a surface with a silicided layer (28) formed on a portion thereof. The application of a programming voltage in the range of ten to fifteen volts from the drain region (17, 22) to the source region (19, 24) has been discovered to reliably form a melt filament (40) across the channel region (26). A gate voltage (V.sub.g) may be applied to the insulated gate (14) over the channel region (26) such that a ten-volt programming voltage (V.sub.PROG) will cause melt filaments to form in those transistors to which the gate voltage is applied, but will not cause melt filaments to form in the remaining transistors (10) of an array.
摘要:
An efficient ESD protection circuit is provided having a resistor (18) disposed between an input pin (12) and the functioning circuitry (22) of an integrated circuit package. A primary switching device (28) is electrically connected between the input pin (12) and a reference voltage pin (14). The resistor (18) comprises an N- well (48) formed within the P- substrate (44) and an N+ diffused reion (50) formed within the N- well (48). A silicided layer (52) is formed over the N+ region (50). The primary switching device (28) is constructed to share the same PN junction (54) utilized by the resistor (18). In constructing the primary switching device (28), a P+ region (70) is formed within the N- well (48). Further, an N+ region (68) is formed within the P- substrate (44). Thus, the primary switching device (40) includes three PN junctions (72, 54, 74) which will conduct at a time prior to, or contemporaneous with, the breakdown of resistor (18).
摘要:
An integrated circuit having an SRAM cell includes a pair of cross-coupled inverters with first driver and load transistors connected to provide a first storage node and second driver and load transistors connected to provide a second storage node. The SRAM cell also includes first and second pass gate transistors controlled by at least one word line and respectively connected between a first bit line and the first storage node and a second bit line and the second storage node; wherein a first driver transistor threshold voltage is different than a second driver transistor threshold voltage and one of the first and second driver threshold voltages is different than a pass gate transistor threshold voltage. Alternately, a threshold voltage of the first and second driver transistors is different than a symmetrical pass gate transistor threshold voltage. Additionally, methods of manufacturing an integrated circuit having an SRAM cell are provided.
摘要:
An integrated circuit containing a diode with a drift region containing a first dopant type plus scattering centers. An integrated circuit containing a DEMOS transistor with a drift region containing a first dopant type plus scattering centers. A method for designing an integrated circuit containing a DEMOS transistor with a counter doped drift region.
摘要:
Methods are disclosed for forming an SRAM cell having symmetrically implanted active regions and reduced cross-diffusion therein. One method comprises patterning a resist layer overlying a semiconductor substrate to form resist structures about symmetrically located on opposite sides of active regions of the cell, implanting one or more dopant species using a first implant using the resist structures as an implant mask, rotating the semiconductor substrate relative to the first implant by about 180 degrees, and implanting one or more dopant species into the semiconductor substrate with a second implant using the resist structures as an implant mask. A method of performing a symmetric angle implant is also disclosed to provide reduced cross-diffusion within the cell, comprising patterning equally spaced resist structures on opposite sides of the active regions of the cell to equally shadow laterally opposed first and second angled implants.
摘要:
The present invention facilitates semiconductor device fabrication by providing mechanisms for utilizing different isolation schemes within embedded memory and other logic portions of a device. The isolation mechanism of the embedded memory portion is improved relative to other portions of the device by increasing dopant concentrations or reducing the depth of the dopant profiles within well regions of the embedded memory array. As a result, smaller isolation spacing can be employed thereby permitting a more compact array. The isolation mechanism of the logic portion is relatively less than that of the embedded memory portion, which permits greater operational speed for the logic.
摘要:
A method of manufacturing a semiconductor device comprising removing a first oxide layer deposited over a semiconductor substrate, thereby exposing source and drain regions of the substrate. The first oxide layer is configured as an etch-stop for forming silicon nitride sidewall spacers of a gate structure located adjacent to the source and drain regions. The method further comprises depositing a second oxide layer selectively on the exposed source and drain regions and then removing lateral segments of the silicon nitride sidewall spacers.