Patents Represented by Attorney Theodore Scott Park
  • Patent number: 4433414
    Abstract: In a digital tester for evaluating electronic components, a local memory unit for each data channel in the tester is loaded with test vector information only in the locations of the memory relating to transitions that take place in the operation of the data channel. In addition, a transition bit is stored in each memory location to signify whether the vector information in that location represents valid transition data. The transition bit is used to control the reading of information from the memory into a register that controls the flow of information in the data channel, so that only the valid transition vectors are fed into data channel control circuitry. This procedure substantially reduces the amount of data that must be loaded into the memory, and hence reduces the total time necessary to thoroughly test a circuit.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: February 21, 1984
    Assignee: Fairchild Camera and Instrument Corporation
    Inventor: Maurice E. Carey
  • Patent number: 4419656
    Abstract: A method and apparatus is described for dynamically testing the overall performance characteristics of digital-to-analog converts and analog-to digital converters which involve excitation of the converters by an orthogonal function signal. Specifically the method comprises dynamically exercising a converter with an analog or digital signal pattern characterized by the sum of a set of mutually orthogonal functions, the sum having substantially uniform amplitude distribution among allowable states (maximum entropy), and simultaneously examining the output response of the converter for a plurality of basic performance parameters. The basic performance parameters typically include distortion, linearity and optimum gain. The simultaneous examination involves sorting out expected responses to simultaneously applied orthogonal signals. The method yields a relatively complete statistical description of the performance characteristics. The preferred excitation is based on the Walsh functions.
    Type: Grant
    Filed: November 7, 1980
    Date of Patent: December 6, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: Edwin A. Sloane
  • Patent number: 4398338
    Abstract: A process for fabricating an electrically erasable nonvolatile memory cell comprises forming a first region of insulating material which is less than about 200 Angstroms thick on a selected surface portion of an electrically-isolated relatively lightly doped pocket of epitaxial silicon of a first conductivity type such that first and second surface areas of the epitaxial pocket are exposed. Regions of the epitaxial pocket underlying the first and second exposed surface areas are doped such that first and second relatively lightly doped regions of a second conductivity type are formed in the epitaxial pocket. Relatively heavily doped polysilicon regions of the first conductivity type are formed on the first insulating region and on the second relatively lightly doped epitaxial region.
    Type: Grant
    Filed: December 24, 1980
    Date of Patent: August 16, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventors: Andrew C. Tickle, Madhukar B. Vora
  • Patent number: 4398244
    Abstract: An interruptible microprogram sequencing unit (MSU) for providing a sequence of microinstruction addresses to a control memory containing microinstructions for the operation of a microprogrammed apparatus. The MSU includes an address output for providing microinstruction addresses to the control memory, an address bus connected to the address output such that a plurality of microinstruction addresses applied to the address bus are sequentially provided to the address output, means connected to the address bus for applying the plurality of microinstruction addresses to the address bus, an interrupt return register operably connected to the address bus for receiving a microinstruction address from the address bus and storing the received microinstruction address, and means connected to the address bus for interrupting the sequence of microinstruction addresses and effecting storage of a microinstruction address on the address bus in the interrupt return register.
    Type: Grant
    Filed: May 7, 1980
    Date of Patent: August 9, 1983
    Assignee: Fairchild Camera & Instrument Corporation
    Inventors: Paul Chu, James B. Klingensmith
  • Patent number: 4393476
    Abstract: A discharge circuit for rapidly discharging the word lines of random access memories to thereby prevent erroneous reading from or writing into the memory during periods when the word lines are in a mid-state transition between selected and deselected voltage levels. Each discharge circuit associated with the memory word lines includes a transistor that is conductive only when a full select voltage level is applied to the word line and which controls conduction of a second multi-collector transistor coupled between top and bottom lines of a word line pair and a current source to discharge the word line pair during the mid-state transition period and to thus increase the speed capabilities of the memory.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: July 12, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: Warren R. Ong
  • Patent number: 4390771
    Abstract: Method and apparatus for forming a ball at the end of bonding wire or lead wire in a capillary wire holding and bonding tool is described suitable for ball bonding of copper and aluminum lead wire to integrated circuit chips. A ball is formed by substantially enclosing the end of the bonding wire in a shroud or shield, flooding the shroud or shield and the end of the bonding wire with an inert gas, and generating a controlled pulse train of a preset count of electrical pulses for establishing arc discharge between the wire and the shroud or shield. The method permits precise control and metering of energy delivered by controlling the parameters of the pulses of the pulse train for melting and forming a ball of uniform quality without oxidation of the metal. Corresponding apparatus and circuitry are described which may be retrofitted into stock ball bonding machines or provide new machines.
    Type: Grant
    Filed: May 11, 1981
    Date of Patent: June 28, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventors: John A. Kurtz, Donald E. Cousens
  • Patent number: 4390598
    Abstract: A lead frame (20) for tape automated bonding includes individual leads (12) each having a stretch loop (40) to accommodate elongation of the loop as the lead is bonded to a substrate (28) after inner lead bonds have been formed to an integrated circuit (26). Such a lead frame allows temporary connection and testing of the circuit prior to final lead formation and packaging.
    Type: Grant
    Filed: April 5, 1982
    Date of Patent: June 28, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: William S. Phy
  • Patent number: 4388525
    Abstract: A process is described for fabricating spacers of a desired thickness of filters, the spacers to be used in separating the filter from an underlying image sensing device. The process includes the steps of forming a pattern of electrically conductive material on one surface of the filter, depositing dry resist to the desired thickness over all of the filter except on the electrically conductive pattern, depositing additional electrically conductive material on at least the electrically conductive pattern, and removing the dry resist.
    Type: Grant
    Filed: February 11, 1981
    Date of Patent: June 14, 1983
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: William S. Phy
  • Patent number: 4386420
    Abstract: A method and circuitry (5) for enhancing the reproducibility and reliability of circuitry for reading a memory array (10a, 10b, 10a', 10b') provides a dynamically generated reference voltage for the sensing circuitry. The invention senses the highest word line voltage and communicates a voltage derived therefrom to the sensing circuitry (26, 27, 28, 29; 26', 27', 28', 29'; 32, 33) to provide a reference voltage. A voltage clamp (62) is coupled to the circuitry for communicating the highest word line voltage (50) to prevent the reference voltge from following the word line too low during transitions. The invention is rendered compatible with the existing write circuitry associated with the memory array (10a, 10b, 10a', 10b') by the provision of disabling circuitry (65) coupled to the communicating circuitry (55, 57) and to the clamp (62).
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: May 31, 1983
    Assignee: Fairchild Camera and Instrument Corp.
    Inventor: Warren R. Ong
  • Patent number: 4377857
    Abstract: An electrically erasable programmable read-only memory (E.sup.2 PROM) is provided which utilizes an inhibit voltage applied to unselected word lines during writing to prevent writing in unselected rows. In the preferred embodiment, each memory cell of the E.sup.2 PROM array consists of a single floating gate field effect transistor. The E.sup.2 PROM of the present invention provides for row erasure and single bit writing.
    Type: Grant
    Filed: November 18, 1980
    Date of Patent: March 22, 1983
    Assignee: Fairchild Camera & Instrument
    Inventor: Andrew C. Tickle
  • Patent number: 4373252
    Abstract: The lateral spacing between buried regions separated by oxide-isolation regions in a semiconductor structure is reduced to as little as one micron by performing a deep implantation of ions of the conductivity type opposite to that of the buried regions generally into portions of the substrate below the sites where the oxide-isolation regions are formed.
    Type: Grant
    Filed: February 17, 1981
    Date of Patent: February 15, 1983
    Assignee: Fairchild Camera & Instrument
    Inventor: Robert E. Caldwell
  • Patent number: 4359490
    Abstract: A low temperature LPCVD process for co-depositing metal and silicon to form metal silicide on a surface such as the surface of a semiconductor integrated circuit wherein the metal is selected from the group consisting of tungsten, molybdenum, tantalum and niobium. A reactor which contains the surface is maintained at a temperature of about 500.degree.-700.degree. C. The reactor is purged by the successive steps of introducing an inert gas into the reactor, introducing a reducing atmosphere into the reactor and introducing hydrogen chloride gas into the reactor. Silane is then introduced into the reactor such that a base layer of polysilicon is formed on the surface. Then, while maintaining silane introduction to the reactor, metal chloride vapor is simultaneously introduced into the reactor such that metal and silicon are co-deposited on the polysilicon as metal silicide.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: November 16, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: William I. Lehrer
  • Patent number: 4357687
    Abstract: An adaptive word line pull-down circuit steers a pull-down current only to the word being pulled down and only for the time when that word is being pulled down. The time that it takes for the bottom word line to fall controls how long the pull-down current is steered to the falling word.
    Type: Grant
    Filed: December 11, 1980
    Date of Patent: November 2, 1982
    Assignee: Fairchild Camera and Instr. Corp.
    Inventor: Roger V. Rufford
  • Patent number: 4352239
    Abstract: A process for suppressing electromigration in conducting lines formed on integrated circuit structures includes the steps of forming the conducting lines on the integrated circuit structure and heat treating the lines to cause the average grain size in the lines to become larger than the width of the conducting lines.
    Type: Grant
    Filed: April 17, 1980
    Date of Patent: October 5, 1982
    Assignee: Fairchild Camera and Instrument
    Inventor: John M. Pierce
  • Patent number: 4351892
    Abstract: An alignment target for an electron-beam direct write system is formed on a wafer of semiconductor material. First, a layer of silicon oxide is formed on a surface of the wafer. Then a layer of silicon nitride is formed on the oxide. Next, an opening is etched in the nitride layer to expose a surface portion of the oxide. The surface portion of the oxide is then etched to form a hole in the oxide. The hole is formed such that the oxide layer is undercut beneath the nitride layer such that a cantilevered nitride overhang is formed around the perimeter of the hole. A layer of aluminum is then deposited over the nitride layer.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: September 28, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: T. Grant Davis
  • Patent number: 4351696
    Abstract: Bromine-containing plasma is utilized to inhibit corrosion of aluminum or aluminum alloy films which have been etched utilizing a chlorinated plasma.
    Type: Grant
    Filed: October 28, 1981
    Date of Patent: September 28, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: Kenneth J. Radigan
  • Patent number: 4335373
    Abstract: A method for statistically calibrating a digital-to-analog converter with an electronic test system. The digital-to-analog converter is excited with two state signals at each input bit which together represent a single signal with uniform amplitude probability with respect to time, and wherein each excitation signal is orthogonal with respect to all other excitation signals. The output of the digital-to-analogconverter is detected by an analog-to-digital converter which has been calibrated by premeasured weighting coefficients with respect to two-state orthogonal signals. The digital time domain output signals are then mapped into a transform domain to obtain weighting coefficients of each bit of the output response. Finally the transform domain weighting coefficients are weighted by the reciprocal of the premeasured weighting coefficients to obtain the unbiased weight of each bit of the digital-to-analog converter under test.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: June 15, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: Edwin A. Sloane
  • Patent number: 4332070
    Abstract: A diffused resistor included in a Schottky device formed in a planar semiconductor material comprises a resistor diffusion formed in the surface of the material and a contact diffusion formed in the surface of the material, the configuration of the contact diffusion being essentially coincident with the shape of the resistor at the location at which ohmic contact to the resistor diffusion is made.
    Type: Grant
    Filed: December 15, 1980
    Date of Patent: June 1, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventor: Rajni Kant
  • Patent number: 4331941
    Abstract: A modulating signal is applied to an analog-to-digital converter which addresses a read-only memory phase look-up table. The read-only memory phase look-up table output is applied to a polarity generator. The polarity generator output and output from a phase accumulator are input to a phase adder. The phase adder output is applied to the input of a sine look-up read-only memory whose output is applied to a digital-to-analog converter and low-pass filtered to produce an amplitude-modulated carrier signal. The invention thereby digitally amplitude modulates a carrier signal in the phase domain without any multiplication being required.
    Type: Grant
    Filed: February 29, 1980
    Date of Patent: May 25, 1982
    Assignee: Hewlett-Packard Company
    Inventors: Al Kovalick, Rolly Hassun
  • Patent number: RE31056
    Abstract: High-speed testing circuitry which, when coupled to one terminal of a multi-terminal electronic device, such as an integrated circuit, can either supply test stimuli signals up to a frequency of 30 MHz, receive output signals produced by the device under test in response to test stimuli signals applied by associated test circuits and compare these signals against computer predicted signals, or provide for parametric testing of the device. .Iadd.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: October 12, 1982
    Assignee: Fairchild Camera & Instrument Corp.
    Inventors: Yuk B. Chau, George Niu, Rudolph Staffelbach