Abstract: An improved logic circuit is disclosed, having an improved disable circuit for disabling the logic circuit at a substantially reduced current level. A modified form of the disable circuit enables the logic circuit to operate either in a three-state mode or in an open-collector mode, as desired. A dynamic Miller shunt is also disclosed for rapidly forcing the active drive device into the non-conducting state each time the phase splitter device assumes the non-conducting state. In addition, an active Miller shunt is disclosed for maintaining the active drive device in the non-conducting state whenever the logic circuit is disabled.

Abstract: A high frequency input signal is applied to one gate of a dual gate MES or MIS field effect transistor. A high gain control voltage is applied to the second gate. To reduce the steepness of the main control slope in the pinch-off voltage region of the transistor a diode combination is connected between the second gate and a node of the amplifier circuit which has a fixed potential lying within the gain control voltage range. The conductive threshold of the diode combination is selected such that the combination becomes conductive when the gate control voltage is sufficient to initiate pinch off of the field effect transistor. The diode combination suitably may comprise a forward conduction diode connected a series opposed polarity with a zener diode or, alternatively, may comprise a series chain of forward conduction diodes.

Abstract: An apparatus and method for printing on plain paper, utilizing a solid-state write head to electrostatically release a pattern of dry toner particles from an informationless toner carrier. The pattern of released toner particles is accelerated across an air gap by an electrical field to impact on the paper.

Abstract: A high power semiconductor switching arrangement controlled by a sensing circuit to suppress transient surges while maintaining operating voltage. The magnitude of a surge determines the rate of current flow through the semiconductor arrangement to maintain the operating voltage required while dissipating the excess power across a load resistance.

Abstract: A simple low-cost fiber optic connector having a body member into which a ferrule is inserted and held in place by an expandable retainer which allows the ferrule to snap out of the assembly upon the application of a substantial pulling force, and thereby avoid damage to the fiber or to the connector. A preferred embodiment includes two aligned ferrules inserted into opposite sides of the body such that their tips meet at the center to interconnect the ends of two optical fibers. A multiple-ferrule embodiment is also contemplated.

Abstract: A microprocessor for oven control has a keyboard for data and instruction entry and a display for displaying desired data, including the oven duty cycle. The microprocessor incorporates a random access memory for storing data entered from the keyboard and also incorporates a read-only memory which controls the operation of the microprocessor for its dedicated purpose.

Abstract: An improvement in a communication system is disclosed having a transmitter which transmits a pulse width modulated control signal having a synchronizing pulse, a reference pulse, and at least one control function pulse encoded therein. At least one receiver receives the transmitted control signal and detects the pulses encoded therein. In response to each detected pulse, a timing circuit in each receiver provides a timing pulse having a width related to a reference signal. A reference controller compares the width of the detected reference pulse to the width of the timing pulse and provides a reference calibration signal at a level automatically selected to reduce the compared pulse width difference. A function controller may be provided to compare the width of the detected control function pulse to the width of the timing pulse, and to perform a control function in response to a predetermined compared width difference therebetween.

Abstract: Monolithic integration of digital logic circuitry, precision control circuitry, and high voltage interface circuits on the same semiconductor chip is achieved, including various combinations selected from D-MOS, vertical NPN, lateral NPN, PNP, P-MOS, N-MOS, and J-FET components. Cathode driver circuits for a plasma display panel are integrated with this technology. Other applications include automotive and television circuits.

Abstract: Monocrystalline gadolinium gallium garnet is prepared by the Czochralski growth process from a melt composed of the oxides of gadolinium and gallium. In order for this process to produce uniform crystal growth, the growing crystal must support a meniscus of liquid above the level of the surrounding melt. This meniscus is held up by the surface tension between the liquid and the growing crystal. It has been established that impurities in the meniscus region lower the surface tension of the liquid phase causing the meniscus to lose contact with the solid phase resulting in nonuniform crystal growth. By the addition of approximately 100 ppm of calcium into the melt, a counteracting effect is produced causing the meniscus to remain in contact with the growing crystal.

Abstract: Apparatus suitable for use with teletext display apparatus which is arranged to operate in a plurality of display modes, including a graphic display mode, in response to digital coded control signals, and to display in each mode digital coded data signals which provide the display information for the viewer. The digital coded control signals are interspersed among the digital coded data signals, with the result that no display information is normally available when a digital coded control signal is present, but the apparatus is so arranged that, in the graphics display mode, the digital coded, data signal which arrived immediately before the digital coded control signal is held over, and used to fill in the blank space that would correspond to the presence of the digital coded control signal. `Hold over` is effected by arranging that a current data signal is held in a data store, and that the stored data is pushed out only by a subsequent data signal.

Abstract: An improved surface acoustic wave sensor in which two surface acoustic wave arrays are disposed in predetermined overlapping relationship by the use of a sealing compound which both establishes a thin sealed cavity and spaces the two surface acoustic wave arrays apart a predetermined distance, thereby eliminating the need for spacing rings or the like.

Abstract: A surface acoustic wave sensor system in which a predetermined level of coupling between two surface acoustic wave arrays is intentionally provided in order to couple radio frequency energy from one into the other and thereby, in cooperative effect with attendant oscillator circuits and a filter, results in the development of a difference frequency which is a function of the sensed condition.

Abstract: The present invention is embodied in a method of operating a dynamic random access memory (RAM) array having individual depletion mode metal-oxide-semiconductor (MOS) transistors as the memory cells. The cells can be programmed to two threshold states providing constant current sensing. Cell programming is by application of appropriate signals to the transistor gate electrode and source. Reading is accomplished by grounding the source and sensing current through the transistor. An intermediate voltage on the gate electrode prevents changes in the state of the cell.

Abstract: A method for fabricating a magnetic memory film is disclosed wherein an epitaxial layer of magnetizable material is grown on the surface of a substrate which has been selectively implanted to damage portions of the crystalline surface. The resulting polycrystalline portion of the epitaxial layer grown on the damaged substrate surface is then selectively removed to leave the monocrystalline portions of the epitaxial layer.

Abstract: Apparatus for modifying an alphanumeric display produced on a cathode-ray tube screen by raster scan to enable the selective generation of double height characters. In order to retain synchronism between line counters and the raster number modifiers are connected to the outputs of the counters to modify the addresses selected from a read only memory for generating the characters.

Abstract: In a color television receiver, especially for NTSC or PAL color television signals, the intermediate frequency is a phase-lock integral multiple of the sub-carrier frequency. Preferably the intermediate frequency is 4N times the sub-carrier frequency, where N is an integer. The receiver may include a crystal controlled oscillator phase locked to a multiple of the color burst frequency, the oscillations from the oscillator compared with the intermediate frequency and the result of the comparison used to control the frequency of a local oscillator. The oscillations from the crystal controlled oscillator may be used directly for synchronous demodulation of the intermediate frequency signal to give a Y or Y-chroma signal and after addition of a signal of sub-carrier frequency and suitable phase adjustment for synchronous demodulation to give U- and V- signals.

Abstract: Plastic housings for electronic components such as plastic cases for electronic wrist watches and calculators have their interior surfaces coated with a first layer of highly-conductive metal to provide static protection for the electronic circuitry contained in the housing, and a second metal layer overlaying the first layer to provide corrosion resistance for the first metal layer. In a preferred embodiment, the metal layers are formed by unique ion plating techniques.

Abstract: A switch consisting of a housing and a spring is provided with convenient attachment means for assembly in combination with a printed circuit board. The spring functions as both an electrical connection means, and as a tension mechanism for biasing the assembly to compensate for tolerances.

Abstract: A two-terminal optical sensor circuit comprising a light-emitting diode, phototransistor, amplifier, and current source electrically and optically coupled so as to approximate an ideal switch in one quadrant of its V-I characteristic. A remote object is detected when it moves into the optical path between the light source and sensor.

Abstract: In an insulated gate field effect transistors having two gate electrodes, the drain-source current can be controlled by voltages applied at the two gate electrodes. Changes in the input voltage at one gate electrode are accompanied by a change in the input capacitance at the other gate electrode causing a change in load impedance for the source controlling this gate electrode which can give rise to undesirable reactions on the source. A source resistance in the form of a voltage divider has a tap which is connected to the second gate electrode. By proper dimensioning of the voltage divider, the gate-source voltage at the first gate electrode can be made to change, in the event of a change in the input voltage applied to the second gate electrode, by an amount sufficient to counteract any undesirable change in the input capacitance at the first gate electrode.