Abstract:
본 발명에 따른 스위칭 회로는 동적 문턱 전압을 갖는 DT-CMOS(Dynamic Threshold - Complementary Metal Oxide Semiconductor) 트랜지스터를 스위칭 소자로 이용하여 정상 모드시에는 낮은 문턱 전압을 유지하도록 하여 전류 구동력을 향상시키면서 도통 손실을 감소시키고, 대기 모드시에는 높은 문턱전압을 유지하도록 하여 전력 소모를 최소화할 수 있다. 따라서, 본 발명에 따른 스위칭 회로를 DC-DC 변환기에 적용하면, 정상 모드시 도통 손실을 줄여 전력 변환 효율을 더 높일 수 있고 대기 모드시 전력 소모를 최소화할 수 있으므로, 휴대기기의 배터리 사용시간을 최대화할 수 있어 점차 소형화되어가는 휴대기기 전원 장치에 유용하게 사용할 수 있는 효과가 있다. 동적 문턱 전압(Dynamic Threshold voltage), DT-CMOS, 스위칭 소자(Switching device), DC-DC 변환기(DC-DC Converter), 펄스 폭 변조(Pulse Width Modulation), 온 저항(On-resistance), 누설전류(Leakage current)
Abstract:
an emitter(2) of n+ buried layer(2) formed on a substrate(1); a polysilicon layer(3), an n- epitaxial layer(4), an oxide layer(5), a nitride layer(6) and a low temp. depositing oxide layer grown on the n+ buried layer(2) in turn; an isolation oxide layer(8) grown to be formed on a trench formed by etching the respective growth layer; a field oxide layer(9) formed by selectively growing an active region to position the interface of the oxide layer and the nitride layer at the n+ buried layer(2); a N+ polycrystal silicon electrode and a collector formed by selectively etching the grown layers; a base contact region formed by selective etching of a side wall nitried layer(15); a base electrode formed by growing the P+ polycrystal silicon layer(18); and a metal wiring formed by covering the contact opening with aluminium. The transistor has the increased voltage and the high switching speed in IIL circuit.
Abstract:
The method includes the steps of sequentially forming a poly-Si film (1), an oxide film (2), a nitride film (3) and a poly-Si film (4) on the substrate; growing and etching an oxide film (6) to define a device size; forming a trench isolation region (7) and poly-Si electrodes (8,9,10), depositing and etching an LPCVD oxide film thereon to expose the poly-Si films (4,8) to form a trench isolation oxide film (12) to remove the film (4) to form an unactive base electrode (25) with boron doping, growing an oxide film (13) on the electrode (25); removing a nitride film (3) to form diffusion layers (14,15,16,17), and forming a self aligned silicide layer (18) and metallic wirings on the electrode (25,26,27); thereby reducing the parasitic resistance component.
Abstract:
The BiCMOS means a combined semiconductor with high speed Bipolar and large scale CMOS. The manufacturing process of BiCMOS involves: (a) forming p-well after the growth of epitaxy layer on n+ region formed on p-type substrate; (b) depositing the nitride film on the oxide film, and isolating the p+ junction; (c) forming base and collector of bipolar transistor by implanting impurities after growth of CMOS gate oxide; (d) forming a gate of CMOS and emitter of bipolar transistor after depositing oxide film on the n+ layer formed by impurities; (e) forming source and drain of PMOS, NMOS; (F) thermal oxidising or soarce and drain of CMOS, and Aluminium metalization.
Abstract:
A horizontal insulated gate bipolar transistor according to an embodiment of the present invention comprises: a first conductive semiconductor substrate; a second conductive drift region formed on the upper part of the first conductive semiconductor substrate; a gate electrode arranged on the first conductive semiconductor substrate; a first emitter electrode which is spaced apart from the gate electrode and is arranged on the first conductive semiconductor substrate to be adjacent to one side surface of the gate electrode; a collector electrode which is spaced apart from the gate electrode and is arranged on a second conductive semiconductor substrate to be adjacent to the other side surface of the gate electrode; a second emitter electrode arranged between the gate electrode and the collector electrode; and a trench insulation film formed between the second emitter electrode and the collector electrode in the second conductive drift region.
Abstract:
A triple well p-type low voltage triggered ESD protection device is provided to perform an operation at a low trigger voltage, to minimize parasitic capacitance, and to obtain a fast response speed to an ESD pulse. A deep n-type well(30) is formed on a p-type substrate(20). An n-type well(40) and a p-type well(50) are formed within the deep n-type well. A bias applying region is formed to apply directly a bias voltage to the p-type well. The bias applying region is formed with a p+ diffusion region(80) which is formed at a junction side of the n-type well and the p-type well.