摘要:
Generally, and in one form of the invention, a p-n junction diffusion barrier is disclosed comprising a first semiconductor layer 28 of p-type conductivity, a second semiconductor layer 32 of n-type conductivity and a third semiconductor layer 30 of p-type conductivity disposed between the first and second layers, the third layer being doped with a relatively low diffusivity dopant in order to form a diffusion barrier between the first and the second semiconductor layers.Other devices, systems and methods are also disclosed.
摘要:
Preferred embodiments include a microstrip patch antenna (38) which also acts as the resonator for an oscillator powered by IMPATT diodes (34, 36); this forms a monolithic transmitter (30) for microwave and millimeter wave frequencies.
摘要:
An integrated circuit including both bipolar and field effect devices is disclosed, comprising a first continuous layer 102/104 of semi-insulating semiconductor material having a continuous first surface, a doped channel region 108 in the first layer 102/104 at the first surface of the first layer 102/104, a doped collector region 114 in the first layer 102/104 at the first surface spaced from the channel region 108, a doped base layer 122 on the collector region 114, the base layer 122 of conductivity type opposite that of the collector region 114, a doped emitter region 124 on the base layer 122, the emitter region 124 of the same conductivity type as the collector 114 to provide a bipolar device, the emitter region 124 made of semiconductor material with a wider bandgap than the base layer 122 semiconductor material, source and drain contacts 138 on the channel region 108, a gate 146 on the channel region 108 between the source and drain contacts 138 to provide a field effect device, and electrical coupling between at least one of the emitter 124, base 122 and collector 114 of the bipolar device and at least one of the gate 146, source and drain 138 of the field effect device. Other devices, systems and methods are also disclosed.
摘要:
A method of anodizing a compound semiconductor comprises(1) plating a metal on the compound semiconductor,(2) contacting the exposed surface of the metal with an electrolyte which permits anodic oxidation of the metal, and(3) passing an electric current through the electrolyte with the exposed surface of the metal acting as an anode, the current density not exceeding 100 microamps per square centimeter of the surface and the quantity of current being more than sufficient to oxidize anodically all the metal.
摘要:
Structure and fabrication details are disclosed for AlGaAs/GaAs microwave HBTs having improved thermal stability during high power operation. The use of a thermal shunt joining emitter contacts of a multi-emitter HBT is shown to improve this thermal stability and eliminate "current-crush" effects. A significant reduction in thermal resistance of the disclosed devices is also achieved by spreading the generated heat over a large substrate area using thermal lens techniques in the thermal shunt. These improvements achieve thermally stable operation of AlGaAs/GaAs HBTs up to their electronic limitations. A power density of 10 mW/.mu.m2 of emitter area is achieved with 0.6 W CW output power and 60% power-added efficiency at 10 GHz. The thermal stabilization technique is applicable to other bipolar transistors including silicon, germanium, and indium phosphide devices. The disclosed fabrication sequence employs an improved two-step polyimide electrical isolation planarization sequence in preparation for fabrication of the thermal shunting element.
摘要翻译:公开了在高功率操作期间具有改进的热稳定性的AlGaAs / GaAs微波HBT的结构和制造细节。 显示使用多发射极HBT的热分流连接发射极触点来改善这种热稳定性并消除“电流冲击”效应。 所公开的装置的热阻的显着降低也通过使用热分流中的热透镜技术在大的衬底区域上扩展所产生的热量来实现。 这些改进实现了AlGaAs / GaAs HBT的热稳定运行,达到其电子限制。 发射极面积为10 mW / m 2,功率密度为0.6 W CW输出功率,60 GHz功率附加效率达到10 GHz。 该热稳定技术适用于包括硅,锗和磷化铟装置在内的其它双极晶体管。 所公开的制造顺序采用改进的两步聚酰亚胺电隔离平面化顺序来制备热分流元件。
摘要:
Preferred embodiments include a microstrip patch antenna (38) which also acts as the resonator for an oscillator powered by IMPATT diodes (34, 36); this forms a monolithic transmitter (30) for microwave and millimeter wave frequencies.
摘要:
Generally, and in one form of the invention, a semi-insulating semiconductor substrate 10 is provided having a first surface. An HBT subcollector region 12 of a first conductivity type is implanted in the substrate 10 at the first surface. A PIN diode region 14 of the first conductivity type is then implanted in the substrate 10 at the first surface and spaced from the HBT subcollector region 12. Next, an i-layer 16 is grown over the first surface. Next, an HBT base/PIN diode layer 22 of a second conductivity type is selectively grown on the i-layer 16 over the HBT subcollector region 12 and the PIN diode region 14. Then, an HBT emitter layer 24/26/28 of the first conductivity type is selectively grown over the HBT base/PIN diode layer 22, the HBT emitter layer 24/26/28 having a wider energy bandgap than the HBT base/PIN diode layer 22. Afterwards, an isolation region 30 is implanted at the boundary between the HBT subcollector region 12 and the PIN diode region 14, the isolation region 30 extending down into the substrate 10. Next, the HBT emitter layer 24/26/28 is etched away over the PIN diode region 14. Lastly, conductive contacts 32, 36, 40, 38 and 42 are formed to the HBT emitter layer 24/26/28, the HBT base layer 22, the HBT subcollector region 12, the PIN diode layer 22 and the PIN diode region 14.Other devices, systems and methods are also disclosed.
摘要:
Generally, and in one form of the invention, a p-n junction diffusion barrier is disclosed comprising a first semiconductor layer 28 of p-type conductivity, a second semiconductor layer 32 of n-type conductivity and a third semiconductor layer 30 of p-type conductivity disposed between the first and second layers, the third layer being doped with a relatively low diffusivity dopant in order to form a diffusion barrier between the first and the second semiconductor layers.
摘要:
Generally, and in one form of the invention, a semi-insulating semiconductor substrate 10 is provided having a first surface. An HBT subcollector region 12 of a first conductivity type is implanted in the substrate 10 at the first surface. A PIN diode region 14 of the first conductivity type is then implanted in the substrate 10 at the first surface and spaced from the HBT subcollector region 12. Next, an i-layer 16 is grown over the first surface. Next, an HBT base/PIN diode layer 22 of a second conductivity type is selectively grown on the i-layer 16 over the HBT subcollector region 12 and the PIN diode region 14. Then, an HBT emitter layer 24/26/28 of the first conductivity type is selectively grown over the HBT base/PIN diode layer 22, the HBT emitter layer 24/26/28 having a wider energy bandgap than the HBT base/PIN diode layer 22. Afterwards, an isolation region 30 is implanted at the boundary between the HBT subcollector region 12 and the PIN diode region 14, the isolation region 30 extending down into the substrate 10. Next, the HBT emitter layer 24/26/28 is etched away over the PIN diode region 14. Lastly, conductive contacts 32, 36, 40, 38 and 42 are formed to the HBT emitter layer 24/26/28, the HBT base layer 22, the HBT subcollector region 12, the PIN diode layer 22 and the PIN diode region 14.