Patents Assigned to Tektronix, Inc.
  • Cathode ray tube with multiple internal graticules
    Patent number: 4283655
    Abstract: A cathode-ray tube for a multipurpose test and measurement or information display instrument is provided with multiple internal graticules. One of the graticules is permanently visible and functional at all times the instrument is in operation. Another of the graticules is formed in a manner such that it is not easily visible in normal ambient lighting conditions alone, but becomes plainly visible when edge lighted by suitable means.
    Type: Grant
    Filed: October 26, 1979
    Date of Patent: August 11, 1981
    Assignee: Tektronix, Inc.
    Inventors: Ralph A. Mossman, Kenneth R. Stinger
  • Graphics matrix multiplier
    Patent number: 4283765
    Abstract: A matrix multiplier is disclosed for rotating, scaling, shearing, and stretching, three-dimensional calligraphic images. This system has particular application to incremental vector generators. The transformations are performed in real time and at the drawing rate of the display device (CRT, plotter, etc.). Complex curved images are transformed as quickly as straight lines. This system reduces matrix multiplication to incremental additions distributed along each line of an image as it is drawn.
    Type: Grant
    Filed: May 25, 1979
    Date of Patent: August 11, 1981
    Assignee: Tektronix, Inc.
    Inventor: Michael L. Rieger
  • Waveform acquisition circuit
    Patent number: 4283713
    Abstract: A waveform acquisition circuit for both real-time and equivalent-time acquisition modes with a smooth transition between modes. The circuit includes a control circuit which causes an analog-to-digital converter to take samples of an analog waveform in precise time relationship with preselected data points along the time axis of the waveform. The data points may be preselected in accordance with a variable increment.
    Type: Grant
    Filed: January 15, 1979
    Date of Patent: August 11, 1981
    Assignee: Tektronix, Inc.
    Inventor: Harald Philipp
  • Faceplate for an electrostatic printing tube and method of making same
    Patent number: 4282456
    Abstract: A method for making a faceplate for an electrostatic printing tube involves the positioning of the faceplate at an angle with respect to a collimated light source so that the pins embedded within the faceplate act as a mask to provide shadowed areas which prevent positive photoresist on a transparent conductive coating adhered to a surface of the faceplate from being exposed to light. The photoresist exposed to light is removed and the conductive coating is etched except where the nonexposed photoresist is located thereby forming elongated conductive pads electrically connected to respective pins. The nonexposed photoresist is removed and the conductive pads are plated with a suitable secondary electron emissive material.
    Type: Grant
    Filed: September 8, 1978
    Date of Patent: August 4, 1981
    Assignee: Tektronix, Inc.
    Inventor: William W. Stein
  • Variable current source having a programmable current-steering network
    Patent number: 4280091
    Abstract: A variable current source having a programmable current-steering network is provided in which a plurality of field-effect transistors both provide current switching and form an integral part of the current source. This is accomplished by switching the field-effect transistors into and out of the feedback loop of a voltage follower, which in turn is connected to a current-setting resistor. Reference voltage for the current-setting resistor is provided by a variable voltage generator. The field-effect transistors are switched by means of a programmable digitally-switched bias generator circuit.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: July 21, 1981
    Assignee: Tektronix, Inc.
    Inventor: David F. Hiltner
  • Cathode ray tube having low voltage focus and dynamic correction
    Patent number: 4277722
    Abstract: A cathode ray tube comprises two electron lens means in combination to crossover the electron beam at a second crossover between the two electron lens means with one of the two lens means having a variable voltage applied thereto to dynamically control the location of the beam crossover in order to focus the beam onto a display screen at any location away from the screen center.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: July 7, 1981
    Assignee: Tektronix, Inc.
    Inventors: Kenneth W. Hawken, Bozidar Janko
  • Direct view storage tube having improved readout performance
    Patent number: 4275355
    Abstract: A flood gun assembly for use in a cathode ray storage tube for uniformly distributing flood electrons over the surface of a storage target includes a mounting member for mounting the flood assembly within the storage tube and on which first flood gun means are mounted. Extensions provided by the mounting member extending toward the corners of the storage target and having second flood gun means mounted thereon.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: June 23, 1981
    Assignee: Tektronix, Inc.
    Inventor: Melvin A. Holznagel
  • Waveform storage system
    Patent number: 4271486
    Abstract: A waveform storage system is provided in which waveform envelopes or maximum signal deviations along a waveform are detected and stored. A sampling clock operates at a predetermined fixed rate independently of a recording clock which is operable at rates determined by the sweep speed and is equal to or slower than the sampling clock. Data from an analog-to-digital converter is simultaneously applied to at least one latch and at least one comparator to be compared with the latch output. If the absolute value of the signal is greater than that stored in the latch, the latch is updated with the new value. The contents of the latch are clocked into memory by the recording clock.
    Type: Grant
    Filed: July 30, 1979
    Date of Patent: June 2, 1981
    Assignee: Tektronix, Inc.
    Inventors: Thomas P. Dagostino, Luis J. Navarro
  • High-speed acquisition system employing an analog memory matrix
    Patent number: 4271488
    Abstract: A high-speed acquisition system employing an analog memory matrix is provided in which sample-hold elements connected to an analog bus are arranged in rows and columns to form an M.times.N matrix. The system is operable in a fast in-slow out mode, and the analog memory matrix may be implemented on a single integrated-circuit semiconductor chip.
    Type: Grant
    Filed: April 13, 1979
    Date of Patent: June 2, 1981
    Assignee: Tektronix, Inc.
    Inventor: Charles L. Saxe
  • Common-emitter f.sub.T doubler amplifier employing a feed forward amplifier to reduce non-linearities and thermal distortion
    Patent number: 4267516
    Abstract: An improved common-emitter cascode f.sub.T doubler amplifier is provided with a feed-forward amplifier circuit to compensate for non-linearities and thermal distortion. The feed forward amplifier senses distortion at the emitters of the f.sub.T doubler amplifier transistors and injects a correction current into a pair of output nodes. The amplifier is also provided with a common-base transistor output stage.
    Type: Grant
    Filed: August 3, 1979
    Date of Patent: May 12, 1981
    Assignee: Tektronix, Inc.
    Inventor: Einar O. Traa
  • Time-multiplexed CCD transversal filter
    Patent number: 4264983
    Abstract: A time-multiplexed CCD transversal filter includes N filter sections each comprising N substantially identical CCD's connected in parallel. An N-phase clock is connected to each filter section to provide a sampling frequency f.sub.s which is N times the clock frequency f.sub.c. The output taps of all the devices in a filter section are weighted in a predetermined manner and summed, and the outputs of all the filter sections are multiplexed to provide a continuously valid output.
    Type: Grant
    Filed: March 19, 1979
    Date of Patent: April 28, 1981
    Assignee: Tektronix, Inc.
    Inventor: Bruce E. Miller
  • Display interpolator employing a transversal filter for a digital oscilloscope
    Patent number: 4263593
    Abstract: A display system for a digital oscilloscope includes an interpolator for interpolating between stored waveform samples and providing additional samples at the interpolated values to thereby increase dot density of the resulting display.
    Type: Grant
    Filed: August 20, 1979
    Date of Patent: April 21, 1981
    Assignee: Tektronix, Inc.
    Inventors: Thomas P. Dagostino, Bruce E. Miller, Luis J. Navarro
  • Method of manufacturing sub-micron channel width MOS transistor
    Patent number: 4261761
    Abstract: Improved, high performance MOS transistors are provided by a method that includes providing an oxygen-impermeable mask on a selected region of a semiconductor substrate, oxidizing the unmasked portion of the surface to provide a thick oxide at least partially recessed in the substrate, which layer includes a smoothly tapered beak that extends between the margin of the mask and the underlying silicon surface, and, after removing the mask, implanting a selected impurity in the substrate beneath the selected region to form a thin impurity layer that terminates at a sloped portion of the substrate formed by the oxidation step.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: April 14, 1981
    Assignee: Tektronix, Inc.
    Inventors: Shuichi Sato, Tadanori Yamaguchi, Arthur D. Ritchie
  • Phosphorus removal from surface regions of phosphosilicate glass microcircuit layers
    Patent number: 4260425
    Abstract: A method for reducing the phosphorus concentration in exposed surface areas of a phosphosilicate glass microcircuit layer to reduce the corrosivity of the layer. The method comprises a two step treatment of the layer surface: first, exposing the surface to water vapor at an elevated temperature for a time sufficient to hydrate available phosphorus in a region adjoining the surface, and second, removing the resultant acidic hydration products by rinsing the surface with water.
    Type: Grant
    Filed: April 4, 1979
    Date of Patent: April 7, 1981
    Assignee: Tektronix, Inc.
    Inventors: Ralph P. Ulrich, Deborah W. Hewitt
  • Electrical connector
    Patent number: 4255003
    Abstract: This disclosure describes an electrical connector for joining microcircuit or microcircuit modules, such as leadless integrated or hybrid circuit carriers to utilization means, such as printed or etched circuit boards or similar means. The electrical contacts through which the microcircuit and utilization means are connected are formed and etched in place on an elastomeric material, precisely located; the material acting as a restoring force to maintain connection. The connector when used in a system maintains transmission line mediums in a single environment.
    Type: Grant
    Filed: January 29, 1979
    Date of Patent: March 10, 1981
    Assignee: Tektronix, Inc.
    Inventor: William E. Berg
  • Insulated web collector storage target for a cathode ray tube
    Patent number: 4254360
    Abstract: An improved bistable storage target structure for a cathode ray tube includes a faceplate-supported apertured web collector electrode and a discontinuous layer of secondary emissive material formed by a plurality of phosphor deposits disposed within the web apertures. A layer of insulating material is provided overlying the web electrode to electrically isolate the phosphor deposits.
    Type: Grant
    Filed: April 8, 1980
    Date of Patent: March 3, 1981
    Assignee: Tektronix, Inc.
    Inventor: Duane A. Haven
  • Compensation indicator for attenuation probe
    Patent number: 4253057
    Abstract: A circuit including a peak detector detects the distortion of the leading corner of a square-wave reference signal in the over-compensated condition of an attenuator probe and turns on an indicator light. The light turns off as the probe is adjusted to the properly compensated condition because the distortion is no longer detected.
    Type: Grant
    Filed: April 26, 1979
    Date of Patent: February 24, 1981
    Assignee: Tektronix, Inc.
    Inventors: Dale E. Carlton, William G. Wilke
  • Digital oscilloscope with reduced jitter due to sample uncertainty
    Patent number: 4251754
    Abstract: Jitter due to sample uncertainty in a digital oscilloscope is reduced by horizontally shifting each frame of a repetitive waveform display to provide an apparent time coincidence of each frame. The time interval between a fixed point on the successive waveforms and the next succeeding clock edge is measured, and a correction voltage is produced to offset the sweep voltage by the corrected amount.
    Type: Grant
    Filed: September 4, 1979
    Date of Patent: February 17, 1981
    Assignee: Tektronix, Inc.
    Inventors: Luis J. Navarro, Thomas P. Dagostino
  • Signal-envelope display system for a digital oscilloscope
    Patent number: 4251815
    Abstract: A signal-envelope display system for a digital oscilloscope includes a memory for storing minimum and maximum signal values in adjacent storage locations, an address counter for sequentially addressing the memory, and a control circuit for selecting the least significant bit of the address count signal arriving at the memory from the least significant bit of the address count signal, a fixed logical low, or a fixed logical high to there by select every address location of the memory, or only the even locations, or only the odd locations over a given count cycle. The values retrieved from memory are converted to analog values and a vector generator connects the analog values to provide connected minimum and maximum values, connected maximum values, and connected minimum values for display. A signal-envelope display is provided by superposing the three displays.
    Type: Grant
    Filed: September 18, 1979
    Date of Patent: February 17, 1981
    Assignee: Tektronix, Inc.
    Inventor: Thomas P. Dagostino
  • Image-forming system for obscuring poster lines
    Patent number: 4251835
    Abstract: A circuit within an image-forming system for enhancing the gray scale quality of a refreshed raster-scan presentation by causing the raster lines of successive frames of such presentation to be successively interlaced whether such frames are of single- or double-field composition. Also disclosed is a hard-copy device employing such a circuit.
    Type: Grant
    Filed: November 6, 1978
    Date of Patent: February 17, 1981
    Assignee: Tektronix, Inc.
    Inventor: Joern B. Eriksen