摘要:
A method for designing integrated circuits (ICs) and their interconnect systems includes IC component cells and interconnect component cells in a cell library. Each IC component cell provides both a physical and behavioral model of a component that may be incorporated into the IC while each interconnect component cell includes both a physical and behavioral model of a separate internal or external component of an interconnect system that may link the IC to external nodes. Both the IC and its interconnect systems are designed by selecting and specifying interconnections between component cells included in the cell library. Interconnect systems are flexibily designed to act like filters tuned to optimize desired frequency response characteristics. Behavior models of the IC and its interconnect systems, based on the behavior models of their selected component, are subjected to simulation and verification tools to determine whether the IC and its interconnect systems meet various performance criteria and constraints. The structural models of the interconnect systems developed during the design process guide subsequent fabrication of interconnect systems for both the IC's intended testing and operating environments.
摘要:
A probe system for providing signal paths between an integrated circuit (IC) tester and input/output, power and ground pads on the surfaces of ICs to be tested includes a probe board assembly, a flex cable and a set of probes arranged to contact the IC's I/O pads. The probe board assembly includes one or more rigid substrate layers with traces and vias formed on or within the substrate layers providing relatively low bandwidth signal paths linking the tester to probes accessing some of the IC's pads. The flex cable provides relatively high bandwidth signal paths linking the tester to probes accessing others of the IC's pads.
摘要:
A screening and survey selection system, method of screening and selecting for a survey and a computer system employing the system and method. In one embodiment, the screening and survey selection system includes a survey queue having a plurality of queue slots, each of the plurality of queue slots including a survey available for a respondent. The screening and survey selection system also includes a random number generator that generates a number pertaining to a selected one of the plurality of queue slots as a function of at least one characteristic associated with the respondent. The screening and survey selection system still further includes a screener block question generator that develops a plurality of screener block questions that determine if the respondent is qualified to participate in a survey corresponding to the selected one of the plurality of queue slots.
摘要:
An electronic device tester channel transmits a single test signal to multiple terminals of electronic devices under test (DUTs) through a set of isolation resistors. The tester channel employs feedback to automatically adjust the test signal voltage to compensate for affects of faults at any of the DUT terminals to prevent the faults from substantially affecting the test signal voltage.
摘要:
In an interconnect system for providing access to a common I/O terminal for multiple circuit devices such as drivers, receivers and electrostatic protection devices implemented on an IC, each such device is provided with a separate contact pad within the IC. The contact pads are linked to one another and to the IC I/O terminal though inductive conductors such as bond wires, metalization layer traces in the IC, or legs of a forked, lithographically-defined spring contact formed on the IC. The conductor inductance isolates the capacitance of the circuit devices from one another, thereby improving characteristics of the frequency response of the interconnect system. The inductances of the conductors and various capacitances of the interconnect system are also appropriately adjusted to optimize desired interconnect system frequency response characteristics.
摘要:
A timing calibration system for a wafer level integrated circuit (IC) tester is disclosed. The tester includes channels linked by paths through an interconnect system to pads of the IC. During a test each channel may send a test signal edge to an IC pad following a clock signal edge with a delay including “programmable drive” delay and “drive calibration” delay components, or may sample an IC output signal following the clock signal edge with a delay including “programmable compare” delay and adjustable “compare calibration” delay components. The interconnect system also links a spare channel to a point on the IC. To adjust the compare calibration delay of each channel, the interconnect system sequentially connects the tester channels to interconnect areas on a “calibration” wafer instead of to the IC on the wafer to be tested. Each interconnect area provides a path linking a channel to be calibrated to the spare channel. With the programmable drive delay of the channel being calibrated and the programmable compare and compare calibration delays of the spare channel set to standard values, the drive calibration delay of the channel being calibrated is adjusted so it sends a test signal edge to the spare channel close to when the spare channel samples it. Pairs of tester channels are then interconnected through another wafer interconnect area. Each channel then sends a test signal edge to the other tester channel with a standard delay following a clock signal edge to provide a reference for calibrating the receiving channel's compare calibration delay.
摘要:
An interconnect system for linking integrated circuits (ICs) mounted on a surface of a printed circuit board (PCB) includes a trace positioned below the surface, one or more vias linking the trace to the surface of the PCB, and other conductors linking pads on the ICs to the vias. Impedances of the various components of the interconnect system are sized relative to one another to optimize interconnect system frequency response.
摘要:
A system for testing integrated circuit devices is disclosed in which a tester communicates with a known good device through a channel. Tester-DUT interface circuitry is provided for monitoring the channel while the tester is writing data as part of a test sequence to locations in the known good device. In response, the interface circuitry writes the data to corresponding locations in each of a number of devices under test (DUTs). The interface circuitry monitors the channel while the tester is reading from the locations in the known good device (KGD), and in response performs a comparison between DUT data read from the corresponding locations in the DUTs and expected responses obtained form the KGD.
摘要:
A printed circuit board (PCB) via, providing a conductor extending vertically between microstrip or stripline conductors formed on separate layers of a PCB, includes a conductive pad surrounding the conductor and embedded within the PCB between those PCB layers. The pad's shunt capacitance and the magnitudes of capacitances of other portions of the via are sized relative to the conductor's inherent inductance to optimize frequency response characteristics of the via.
摘要:
Described herein is a probe card assembly providing signal paths for conveying high frequency signals between bond pads of an integrated circuit (IC) and an IC tester. The frequency response of the probe card assembly is optimized by appropriately distributing, adjusting and impedance matching resistive, capacitive and inductive impedance values along the signal paths so that the interconnect system behaves as an appropriately tuned Butterworth or Chebyshev filter.