Abstract:
A differentially phase shift keyed demodulator (52) for use in an interrogator of a remote intelligent communication system. The demodulator includes a quadrature combiner (64) delaying one of the quadrature signals and thereafter combining the delayed and undelayed signals along with a FIR matched filter (66), which filters the combiner output whereby the differentially phase shift keyed data on a sub-carrier can be demodulated using a simple delay and multiplying scheme (68, 70) in response to the filtered output.
Abstract:
An integrated circuit, such as a memory integrated circuit, includes a vernier clock adjustment circuit receiving an input clock signal and providing a rising-edge clock signal representing the input clock signal delayed by a rising-edge delay and providing a falling-edge clock signal representing the input clock signal delayed by a falling-edge delay. An edge triggered circuit receives data and the rising-edge and falling-edge clock signals, and stores data at the rising-edge of the rising-edge clock signal and at the falling-edge of the falling-edge clock signal. One form of the invention is a memory system having a memory controller coupled to memory modules through data and commande busses. Each memory module includes the vernier clock adjustment circuitry.
Abstract:
An output driver circuit offers wave-shaping and logic level adjustment for high speed data communications in a synchronous memory such as a dynamic random access memory (DRAM). Level adjustment is obtained by resistive division between a termination resistor and controllable impedances between an output node and VDD and VSS power supplies. Wave-shaping functions include slew rate modification of the signal at the output node, by sequentially turning on or off output transistors in response to a transition in an input signal. Different schemes of weighting the output transistors obtain different wave-shaping characteristics of the output signal.
Abstract:
A method and apparatus for cutting and applying adhesive tape to a lead frame for a lead-on-chip (LOC) semiconductor package are provided. The method includes indexing double sided adhesive tape (54) into a guide opening, and then moving a tape cutter (52) through the guide opening (50) to cut the tape into a decal (74) having finished dimension equal to the width of the tape (54). The finished dimension can be either the width or length of the decal (74). In either case the decal (74) is formed with only two cut edges and no wasted tape (54). The tape cutter (52) in addition to cutting the tape (54) also presses the cut decal (74) against the lead frame (42); a pair of tape feed rollers (46, 48) for indexing the tape (54); a tape guide (50) for guiding and positioning the tape for cutting; and a tape cutter assembly (52) for cutting and pressing the cut decal (74) against the lead frame (12). The tape cutter assembly (52) includes the guide opening (50) and a tape cutter adapted to move through the guide opening.
Abstract:
A temporary package for testing semiconductor dice, a method for forming the temporary package and a method for testing dice using the temporary package are provided. The temporary package (14) includes hard-metal ball contacts (38) arranged in a dense grid pattern, such as a ball grid array. The dense grip pattern allows the temporary package to include a large number of ball contacts (e.g., 50 to 1000 or more) to permit testing of a die (12) having a large number of bond pads or input/output signals. The ball contacts can be formed of a metal such as nickel, copper or beryllium copper and are adapted to resist wear, deformation and breakage during continued use of the package. For forming the package, a package base can be formed with land pads and the ball contacts can be attached to the land pads by soldering, brazing, welding, or with a conductive adhesive.
Abstract:
A polishing pad (42) for use in chemical-mechanical planarization (CMP) of semiconductor wafers includes a multiplicity of elongated microcolumns (48) embedded in a matrix material body (44). The elongated microcolumns (48) are oriented parallel to each other and extend from a planarizing surface used to planarize the semiconductor wafers. The elongated microcolumns (48) are uniformly distributed throughout the polishing pad (42) in order to impart uniform properties throughout the polishing pad (42). The polishing pad can also include elongated pores (50) either coaxial with or interspersed between the elongated microcolumns (48) to provide uniform porosity throughout the polishing pad (42).
Abstract:
An IC module (20), such as a Multi-Chip Module (MCM), includes multiple IC (12) dice each having a test mode enable bond pad (30), such as an output enable pad. A fuse incorporated into the MCM's substrate connects each dice's test mode enable pad to one of the MCM's no-connection (N/C) pins, and a resistor incorporated into the substrate connects the test mode enable pads to one of the MCM's reference voltage pins. By applying a supply voltage to the test mode enable pads through the N/C pin, a test mode is initiated in the dice. Once testing is complete, the fuse may be blown, and a reference voltage applied to the test mode enable pads through the reference voltage pins and the resistor disables the test mode in the dice and initiates an operational mode. As a result, dice packaged in IC modules may be tested after packaging. A method for performing such testing once the test mode has been initiated and for repairing any failing elements found during testing, includes providing test signals to the dice, receiving response signals from the dice, evaluating the response signals to identify any failing elements in the dice, programming the failing elements addresses into anti-fuses in the dice with a programming voltage, confirming that the addresses are programmed by determining the resistance of the anti-fuses, re-testing the dice, receiving response signals from the re-tested dice, and evaluating the response signals to confirm all repairs.
Abstract:
Tracking circuitry is described for use in a memory device. The tracking circuitry can be used to monitor word line voltages in a dynamic random access memory (DRAM) and includes a comparator circuit which compares a simulated word line signal to a digit line equilibrate bias voltage. The equilibrate bias voltage is generated using either memory column circuitry or a linear resistor voltage divider.
Abstract:
A process for making a semiconductor device and the resulting device having standardized die-to-substrate bonding locations are herein disclosed. The semiconductor die (32) provides a standard ball grid or other array of a particular size, pitch and pattern such that as the size, configuration or bond pad arrangement of the die changes, a standard substrate (60) (the term including leadrames) having a similarly standardized array of terminals (62, 64) or trace ends can be employed to form a semiconductor device (30). It is also contemplated that dies having markedly different circuitry but a common array pattern may be employed with the same substrate or other carrier.