Abstract: A method for optimizing a pattern generation program used in a signal generator comprising a generator for generating a signal pattern based on a pattern generation program, a memory for storing the signal pattern, and an output for outputting on a predetermined cycle the signal pattern stored by the memory, this optimizing method comprising an evaluation step for evaluating for each command of the pattern generation program whether it is necessary to develop the command in question of the program and a development step for developing the command.

Abstract: A circuit and method for efficiently configuring an ACAM Select RAM for an ACAM circuit of a tester that tests multiple devices under test (DUTs).

Abstract: A measurement apparatus for FET characteristics comprises a divider connected to a pulse generator for dividing pulses from the pulse generator into first and second pulses; a first SMU; a first switch for selecting pulses from the divider or voltage from the first SMU; a terminal resistor for applying signals from the first switch and supplying the signals to the first terminal of the device under test; a second and a third SMU; a bias-T connected to the third SMU; a second switch for selecting to connect the second terminal of the device under test to the second SMU or to connect the second terminal to signals of the bias-T obtained by multiplexing the voltage from the third SMU; and voltage measurement unit connected to the divider and the bias-T.

Abstract: A touch indication device comprises a light guide structure for passing light of a light source via total internal reflection. A touch surface disturbs the total internal reflection when touched, causing light to leave the light guide structure. A light enhancement layer converts the light leaving the light guide and sends the converted light to a light detector. The light enhancement layer amplifies the intensity and/or changes the color of the light leaving the light guide. The detector determines the position of the touch on the touch surface based on the light from the light enhancement layer.

Abstract: A dual port memory is updated at substantially the same data sampling rate as a clock frequency of the dual port memory. The dual port memory stores data relating to each different parameter value in a stream of data samples, and provides the stored data from an address in the memory corresponding to the received parameter value. An updating element updates stored data and provides the updated data to an input of the dual port memory for writing back into the address corresponding to the received parameter value. A first port of the dual port memory is utilised as the output of the dual port memory coupled to the input of the updating element on a first clock cycle of the dual port memory, and a second port of the dual port memory is normally utilised as the input of the dual port memory coupled to the output of the updating element on a second clock cycle, the next address being accessed via the first port on the second clock cycle.

Abstract: Zero crossings for a non-symmetrical VIN may be determined by first amplifying and clipping VIN to create a non-symmetrical square wave whose zero crossings are those of VIN. A selected polarity edge of the non-symmetrical square wave may be taken as a 0° indicator and is used to create a fundamental sawtooth ramp of the same frequency and in phase with VIN. The fundamental sawtooth ramp starts at zero volts, linearly ramps to some peak and is AC coupled to a comparator whose other input is zero volts. That creates a square wave that is symmetrical as to its half-cycles, and whose every other edge is synchronous with the start of the fundamental sawtooth ramp, and whose intervening edges occur in the middle of the ramp. The intervening edge is detected and taken as a 180° indicator.

Abstract: A semiconductor testing system including an input; a display; multiple testing units; a memory in which is stored multiple applications that specify the operating procedure of the testing units and multiple categories that are related to the applications; and a controller that has the function of displaying the categories, displaying on the display the applications relating to the categories selected based on the input from the input, and conducting the applications that have been selected by the input from among the displayed applications and controlling the testing units, and the like.

Abstract: An IQ modulator's performance is optimized through determination of suitable control parameters by the application of known DC biases as the I and Q inputs. Also known are the relative amplitude and actual phase of the sine and cosine carriers to be modulated before they are summed. It is shown that by measuring an RMS voltage Atotal an appropriate number of times for a related combination of the applied DC biases in conjunction with the other known input parameters, a number of behavior parameters that are indicative of mixer performance can be discovered through analysis, such as the solution of a system of linear equations. The combination of behavior parameters may be assigned a Figure Of Merit (FOM) that can be taken as an indication of the degree to which mixer operation approaches ideal behavior. The control parameters may be perturbed over a selected range, and the extraction of the behavior parameters repeated.

Abstract: A management method for data in a semiconductor characteristic evaluation apparatus comprised of a control unit, a memory unit, and input/output units includes steps for selecting the workspace including the test programs for testing a plurality of wafer types, for storing the test results in the selected workspace as histories, and for searching for the desired test results from the histories of the stored test results.

Abstract: A method for mapping a spectrum obtained from signals under test corresponding to linearly spaced frequencies to logarithmically spaced frequencies in a measuring apparatus. A spectrum within a predetermined frequency range from logarithmically spaced frequencies is selected from this spectrum corresponding to linearly spaced frequencies and vector averaging of the selected spectrum is performed.

Abstract: Disclosed is a product that provides a test executive program for controlling tests on a device under test that is separate and distinct from the test executive system. The product may be embodied in a media storing instructions that direct a processing unit to 1) perform an electronic test on the device under test, 2) provide an interface for communicating with an external system that is distinct from the test executive program, and for permitting the test system to be operated by the external system, 3) communicate with the external system, and 4) in response to signals generated by the external system, operate the test system. Other test executive methods and apparatus are also disclosed.

Abstract: A system for building a packet of test data for testing a communications network comprises a characterizing component which describes one or more protocols by providing one or more rules which are used to build the packet of test data. The system also includes a packet building component for building the packet of test data in accordance with the one or more protocol descriptions, and a storage component for storing one or more packets which are built by the packet building component.

Abstract: In apparatus for generating a Complementary Cumulative Distribution Function (CCDF) curve for an input signal, an analog to digital converter (ADC) samples the input signal at sampling points to provide a parameter value corresponding to a desired parameter of the input signal at each sampled point. A memory element provides a frequency count of occurrence of each received parameter value from an address in the memory corresponding to the received parameter value. An adder receives the frequency count, increments the count and provides the incremented count to an input of the memory element for writing back into the address corresponding to the received parameter value. A CCDF curve generating module reads the frequency count stored in the memory element corresponding to each parameter value and generates a CCDF curve therefrom.

Abstract: Digital samples corresponding to a pulsed input signal are provided from an ADC to a memory for storage and to a pulse extraction circuit. The pulse extraction circuit detects the leading and trailing edges of pulses in the input signal. The digital samples are stored in both a Current memory buffer and a Next memory buffer. When a pulse trailing edge is detected, the Current buffer is stopped from storing further samples, the Next buffer becomes the Current buffer and a new buffer becomes the Next buffer. Digital data samples are then provided from the (previous) Current buffer after it has stopped storing samples.

Abstract: An electronic instrument system uses a “DualPlay” concept comprising first and second mutually-exclusive modes of operation. The system includes an instrument module having first and second communications channels, each for linking the instrument module to one or more processors. The first communications channel comprises a first connector attached to the instrument module for mating to a backplane connector electrically connected to traces. The system operates in the first mode when the instrument module communicates through the first communications channel. Additionally, the system operates in the second mode when the instrument module communicates through the second communications channel, the first connector is disengaged from the backplane connector and the electronic instrument is not communicating through the first communications channel.

Abstract: A system generates and verifies signatures on hardcopy documents. A signor key is associated with a signor of a hardcopy document. A document signature is generated using the signor key to encode data selected from document data required to be on the hardcopy document. The document signature is then associated with the hardcopy document. A data indicator is also associated with the hardcopy document and indicates which of the document data is used to generate the document signature. A verification section receives the hardcopy document having the document data thereon, and also receives the document signature and the associated data indicator. The verification section performs a comparison to determine whether the document signature was generated using the signor key and the document data indicated by the data indicator.

Abstract: A video server system having the ability to playback movies at a higher than recorded speed. A storage device stores one or more of the movies to be played back. The storage device has the ability to playback the movies in selected segments. A controller is connected to the storage device for causing the storage device to playback a sequential set of movie segments with an alternating series of intervening movie segments missing therefrom. In addition to Fast Forward and Fast Reverse commands, Pause, Slow, Play and Stop commands are also implemented.

Abstract: The interaction structure with integral coupling and bunching section and method of use of the present invention produces backward wave oscillations in an RF structure which combines ballistic bunching and extended beam-wave interaction in a complex resonator assembly. The complex extended interaction structure includes a five-gap electromagnetically-coupled cavity structure with a coaxial section inserted between the first and second cavities. The first cavity serves as a buncher cavity while the four subsequent cavities serve as energy cavities. In the coaxial section, beam and wave propagate in separate channels. The field in the buncher cavity is coupled to the four subsequent energy extraction cavities through the wave channel between the inner and outer conductors of the coaxial section, while the electron beam drifts along a cylindrical channel cut through the inner conductor of the coaxial section.