摘要:
An MCM including a resonator made using conventional MCM fabrication techniques. The MCM's resonator is constructed with overlapping first and second spiral-shaped regions of metallic material separated by a layer of dielectric material. A via disposed in the layer of dielectric material, couples the spiral-shaped regions of metallic material together, thereby utilizing self winding and internal capacitance to gain resonance at frequencies between 500 MHz to 3GHz. The internal capacitance is increased by controlling the overlap between the first and second spiral-shaped regions of metallic material. On a high-resistivity substrate, the monolithic resonator achieves a Q of at least 19 at approximately 900MHz and at least 24 at approximately 2GHz.
摘要:
In accordance with the invention, a thin film capacitor including a dielectric of nitrogen or silicon-doped tantalum oxide and at least one electrode including chromium. Preferably the capacitor is fabricated by anodically oxidizing TaN.sub.x or Ta.sub.2 Si and forming a Cr counterelectrode. The method is fully compatible with MCM processing. It produces anodic Ta.sub.2 O.sub.5 capacitors having exceptionally low leakage currents ( 4 MV/cm) and high capacitance densities (70 nF/cm.sup.2). The devices are stable at 350.degree. C. with excellent capacitor properties and are particularly useful as thin film capacitors of large area (>1 mm.sup.2).
摘要:
The present inventors have discovered that fine patterns of metal or insulator can be formed on printed circuit board using conventional lithographic steppers with inverted projection lenses. The inverted projection lenses act as enlargement lenses rather than reducing lenses and exhibit a large depth of focus sufficient to accommodate the deviations of PC board from planarity. The inverted lens reduces the size of the image needed at the mask, permitting multiple mask levels to be combined on a single glass. This reduces the cost of the mask set and permits the use of smaller glass masks having greater accuracy and dimensional stability than the convention mylar masks used for PC board. By inverting the projection lenses on near-obsolete steppers, applicants were able to form metal patterns on PC board of finer dimension than heretofore reported. Inverting a 5.times. ZEISS lens on a GCA 6300A stepper, applicants were able to form vias of less than 25 .mu.m diameter, pattern metal lines and spaces of less than 25 .mu.m, and obtain overlay registration accuracy of less than 25 .mu.m. The field size was larger than 1 in.sup.2, and the depth of focus was greater than 50 .mu.m.
摘要:
A silicon-on-silicon dual MCM apparatus comprising a printed circuit board having a voltage isolation boundary contained therein supporting a pair of multi-chip modules on either side of the voltage isolation boundary. The MCMs safely convey signals across the isolation boundary via discrete optical coupling means or the like. The optical coupling means allow safe and efficient conveyance of signals across the voltage isolation boundary enabling a designer to group high voltage components on one side of the boundary and low voltage components on the other side of the boundary. This obviates to a degree the need for multi-layered PCBs. A relatively large number of passive components (resistors and capacitors) are integrated into a silicon substrate with flip-chip analog integrated circuits (ICs). Operational characteristics of the controller are verified after integration and are compared to the discrete version. High voltage isolation requirements, interference, and noise are all considered to determine the most critical portions of the dual MCM layout and design.
摘要:
Only one or only a few channels are sent at a time from circuitry located in a curbside box, via a link such as either a coaxial or a fiber cable, into a customer's home TV set or personal computer. However, many more than a few channels are delivered to the curbside box, via a link such as a fiber or a coaxial cable, from a central office or a central bank of paid video-movies to be selected by the customers. Thus whereas the link from the central office or central bank is relatively broad-band (e.g. 500 MHz to 1,000 MHz), the cable from the curbside to the home (or any other kind of building) can be relatively narrow-band (e.g., 5 MHz to 50 MHz). The curbside box serves a multitude of homes--a separate (narrow-band) cable running to each home from the (same) curbside switch. Each channel can be a free radio or free TV channel, a stored or an on-line newspaper pay channel, or a pay TV channel, or a pay-per-view channel (i.e., the customer must give advance notice per view, and may begin viewing in the middle of a selected program, or may come in at the beginning of a selected program with a short delay, depending on the sender's arrangement). Requests from each TV set in each home (e.g., initiated by means of a hand-held remote control infra-red sending device) can be sent to the curbside box from the home along a link such as a wire or along the same curbside-to-home cable itself. In addition, billing of customers can be accomplished by means of another link connecting a junction in the wire or in the curbside-to-home cable to one or more remote billing centers.
摘要:
The specification describes integrated circuit air isolated crossover interconnections designed for flip chip multi-chip module interconnection technology. The crossovers are made using a crossover interconnection substrate separate from the interconnection substrate of the integrated circuit. In one embodiment the integrated circuit is flip chip bonded to a multi-chip or multi-component interconnection substrate, and the crossover interconnections are made through solder bumps or balls soldered to a conductive layer on the crossover interconnection substrate. In another embodiment the crossover is made via a crossover substrate flip chip bonded to an integrated circuit mounted on a multi-chip or multi-component interconnection substrate.
摘要:
A multi-chip module (“MCM”) and methods of operation and manufacture thereof. The MCM includes: (1) a substrate for supporting a plurality of separate integrated circuit (IC) chips thereon, (2) first and second separate IC chips mounted on the substrate, the first separate IC chip including first and second circuit portions coupled together by at least one signal conductor, and (3) interconnecting means that directly couples at least one signal conductor of the first separate IC chip to the second separate IC chip, the interconnecting means bypassing the second circuit portion of the first separate IC chip.
摘要:
A multi-chip module (“MCM”) and methods of operation and manufacture thereof The MCM includes: (1) a substrate for supporting a plurality of separate integrated circuit (IC) chips thereon, (2) first and second separate IC chips mounted on the substrate, the first separate IC chip including first and second circuit portions coupled together by at least one signal conductor, and (3) interconnecting means that directly couples at least one signal conductor of the first separate IC chip to the second separate IC chip, the interconnecting means bypassing the second circuit portion of the first separate IC chip.
摘要:
The specification describes method for improving the edge acuity of conductive metal strips formed by thick film paste techniques. The advantages of the bulk properties of strips formed using thick film technology are realized while the drawback of poor edge definition is overcome using a thin film trim strip at the edge of the conductive strip.
摘要:
An apparatus is provided that improves memory storage and access speed by repackaging various types of memories, SRAM, DRAM, and Disk, into a single storage unit. Each unit contains a slice of all the various memories along with programmable logic to control the accessing of the memories. This unit appears to the central processing unit (CPU) of a computer system as an extremely large secondary cache. Independent management of each unit greatly reduces bus traffic to implement any particular address space. By using a plurality of these memory units, an extremely large amount of memory can be accessed by the CPU with the speed of accessing a cache system.