摘要:
A method of forming a BiCMOS integrated circuit having a raised extrinsic base is provided. The method includes first forming a polysilicon layer atop a surface of a gate dielectric which is located atop a substrate having device areas for forming at least one bipolar transistor and device areas for forming at least one complementary metal oxide semiconductor (CMOS) transistor. The polysilicon layer is then patterned to provide a sacrificial polysilicon layer over the device areas for forming the at least one bipolar transistor and its surrounding areas, while simultaneously providing at least one gate conductor in the device areas for forming at least one CMOS transistor. At least one pair of spacers are then formed about each of the at least one gate conductor and then a portion of the sacrificial polysilicon layer over the bipolar device areas are selectively removed to provide at least one opening in the bipolar device area. At least one bipolar transistor having a raised extrinsic base is then formed in the at least one opening.
摘要:
A method of fabricating a high-performance, raised extrinsic base HBT having a narrow emitter width is provided. In accordance with the method, a patterned nitride pedestal region and inner spacers are employed to reduce the width of an emitter opening. The reduced width is achieved without the need of using advanced lithographic tools and/or advanced photomasks.
摘要:
Disclosed are a motor and a rotor thereof. Taking the distance between the two endpoints of a permanent magnet (20) of a motor rotor that are on the side away from the centre of an iron core (10) as the length L of the permanent magnet, and the distance between a line connecting the two endpoints of the permanent magnet that are on the side away from the centre of the iron core (10) and the centre point on the side of the permanent magnet that is close to the centreline of the iron core as the width H of the permanent magnet, then H/L≧1/10. By adjusting the relationship between the length L and width H of the permanent magnet, the air gap magnetic density of the permanent magnet can be effectively increased, i.e. increasing the permanent magnetic flux of the rotor in the directions of the d axis and q axis. Hence, the utilization rate of the permanent magnet and the performance of the rotor can be improved without increasing the number of permanent magnets used.
摘要:
Disclosed are a motor rotor and a motor having same, wherein the motor rotor comprises an iron core (10) and permanent magnets (20) provided within the iron core (10), sets of mounting grooves (30) are provided in the peripheral direction of the iron core, with each set of mounting grooves comprising more than two mounting grooves (30) arranged intermittently in the radial direction of the iron core (10). The permanent magnets (20) are correspondingly embedded into the individual mounting grooves (30). The thickness of the permanent magnet (20) at the centre of the cross section thereof and perpendicular to the rotor axis is greater than the thickness at both ends thereof. The rotor optimizes the shape of the permanent magnets (20) and improves the efficiency of the motor.
摘要:
Disclosed is a permanent magnet synchronous motor comprising a stator (1) and a rotor (2), wherein the stator (1) is provided thereon with a plurality of wire slots (3) in a circumferential direction, the rotor (2) is provided therein with a plurality of sets of magnet slots (5) in a circumferential direction, with the wire slots (3) being provided therein with coils (4) and the sets of magnet slots (5) being provided therein with permanent magnets (7); the number of poles of the permanent magnets (7) on the rotor (2) is P, the spacing between two adjacent sets of magnet slots (5) is W, the tooth width of the stator (1) is Lc, and the number of the wire slots (3) on the stator (1) is S, wherein 3PW/LcS=K, and 0.15≦K≦0.85. The permanent magnet synchronous motor can reduce dependence on rare earth and improve the output torque of the permanent magnet synchronous motor.
摘要:
Disclosed is a permanent magnet synchronous electric machine, comprising a stator (1) and a rotor (2). A plurality of wire grooves (3) are provided peripherally on the stator (1), coils (4) are provided within the wire grooves (3), and a stator tooth (5) is provided between adjacent wire grooves (3). A plurality of magnetic groove sets (6) is provided peripherally within the rotor (2), each of the magnetic groove sets (6) comprising at least two magnetic steel grooves (7), with permanent magnets (8) placed within the magnetic steel grooves (7), and a magnetic channel (9) formed between the magnetic steel grooves (7). Of two adjacent magnetic channels (9), an end of one magnetic channel (9) is opposite a wire groove (3) and an end of the other magnetic channel (9) is opposite a stator tooth (5). The permanent magnet synchronous electric machine has a more steady output torque, and also reduces the noise and vibration provided during operation.
摘要:
Channel depth in a field effect transistor is limited by an intra-layer structure including a discontinuous film or layer formed within a layer or substrate of semiconductor material. Channel depth can thus be controlled much in the manner of SOI or UT-SOI technology but with less expensive substrates and greater flexibility of channel depth control while avoiding floating body effects characteristic of SOI technology. The profile or cross-sectional shape of the discontinuous film may be controlled to an ogee or staircase shape to improve short channel effects and reduce source/drain and extension resistance without increase of capacitance. Materials for the discontinuous film may also be chosen to impose stress on the transistor channel from within the substrate or layer and provide increased levels of such stress to increase carrier mobility. Carrier mobility may be increased in combination with other meritorious effects.
摘要:
A method for fabricating substantially relaxed SiGe alloy layers with a reduced planar defect density is disclosed The method of the present invention includes forming a strained Ge-containing layer on a surface of a Si-containing substrate; implanting ions at or below the Ge-containing layer/Si-containing substrate interface and heating to form a substantially relaxed SiGe alloy layer that has a reduced planar defect density. A substantially relaxed SiGe-on-insulator substrate material having a SiGe layer with a reduced planar defect density as well as heterostructures containing the same are also provided.
摘要:
A method of forming a field effect transistor creates shallower and sharper junctions, while maximizing dopant activation in processes that are consistent with current manufacturing techniques. More specifically, the invention increases the oxygen content of the top surface of a silicon substrate. The top surface of the silicon substrate is preferably cleaned before increasing the oxygen content of the top surface of the silicon substrate. The oxygen content of the top surface of the silicon substrate is higher than other portions of the silicon substrate, but below an amount that would prevent epitaxial growth. This allows the invention to epitaxially grow a silicon layer on the top surface of the silicon substrate. Further, the increased oxygen content substantially limits dopants within the epitaxial silicon layer from moving into the silicon substrate.
摘要:
Channel depth in a field effect transistor is limited by an intra-layer structure including a discontinuous film or layer formed within a layer or substrate of semiconductor material. Channel depth can thus be controlled much in the manner of SOI or UT-SOI technology but with less expensive substrates and greater flexibility of channel depth control while avoiding floating body effects characteristic of SOI technology. The profile or cross-sectional shape of the discontinuous film may be controlled to an ogee or staircase shape to improve short channel effects and reduce source/drain and extension resistance without increase of capacitance. Materials for the discontinuous film may also be chosen to impose stress on the transistor channel from within the substrate or layer and provide increased levels of such stress to increase carrier mobility. Carrier mobility may be increased in combination with other meritorious effects.