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| Number | Title | Issue Date |
| 4687957 | Fiber optic transceiver A half-duplex transceiver circuit is disclosed in which a single diode acts as both the light emitter and the light detector. The diode is connected in parallel with a junction in an associated device. The forward voltage drop across the diode exceeds the... | 08/18/1987 |
| 4678946 | Circuit in which output circuit and operational amplifier equipped input circuit are electrically isolated A function generator which has a plurality of operational amplifiers and a reference voltage generator circuit for applying a different reference voltage to the input terminal of each of the plurality of operational amplifiers. Also included is an LED con... | 07/07/1987 |
| 4675547 | High power transistor base drive circuit In a base drive circuit for a high power transistor, an external signal is applied to the circuit by an optical coupler. In response to the external signal, the circuit provides a positive current to the high power transistor in order turn it on. The posi... | 06/23/1987 |
| 4667161 | Pulse shaping with transmission lines A method and apparatus for forming shaped voltage pulses uses passive reflection from a transmission line with nonuniform impedance. The impedance of the reflecting line varies with length in accordance with the desired pulse shape. A high voltage input p... | 05/19/1987 |
| 4665311 | Smoke detecting apparatus A light sensing apparatus comprising a solid-state photocell responsive to low levels of light connected to an impedance matching buffer stage, a gain controlled amplifier stage and an output amplifier stage; a gain control network controlled by a tempera... | 05/12/1987 |
| 4665316 | Photovoltaic relay switch A photovoltaic relay which includes a unique pull down circuit for rapidly turning off the relays field effect transistor(s). The pull down circuit discharges the gate-to-source capacitance of the relay's field effect transistors by turning on a thyristor... | 05/12/1987 |
| 4659930 | Radiation hard visible light readout circuit A pair of photodetectors are electrically connected in series. A common interconnection point of the two photodetectors is electrically connected to the inverting input of an opertional amplifier to provide a signal indicative of visible light falling on ... | 04/21/1987 |
| 4658145 | Solid state relay A solid state relay includes a diode for emitting light, a photothyristor circuit responsive to the light from the diode for turning on and outputting a first output signal, the photothyristor circuit having two photothyristors connected to each other in ... | 04/14/1987 |
| 4658129 | Photoelectric control device which detects changes in light intensity A photoelectric control device having a photoelectric sensing unit for delivering an output voltage in response to changes of the intensity of light, the output voltage being applied to a capacitor for operating a SCR. When the output voltage reaches a pr... | 04/14/1987 |
| 4656366 | Control circuitry using two branch circuits for high voltage solid-state switches To switch a first gated diode switch (GDSL1) to the "OFF" state requires a voltage applied to the gate which is more positive than that of the anode or cathode and a sourcing of current into the gate of substantially the same order of magnitude as flows b... | 04/07/1987 |
| 4652764 | Current source circuit with a photo coupler A current source circuit contains a transistor for controlling current flowing into an electric/photo converting element in a control photo coupler so that current flowing into a photo/electric converting element in the control photo coupler is equal to a... | 03/24/1987 |
| 4651023 | Electronic switch An electronic switch has a pair of light dependent resistors forming part of a potential divider with the hysteresis of the circuit being high enough to prevent equally applied changes in light level from effecting the switch action. The divider controls ... | 03/17/1987 |
| 4647792 | High speed laser driver A high speed laser driver includes a differential pair of bipolar transistors sharing a common emitter resistor as in the prior art. However, an improvement thereover resides in the use of Schottky barrier diodes, one of which couples the emitter of one t... | 03/03/1987 |
| 4643568 | Method and apparatus for measuring the illuminating power of incident light The invention relates to measuring illuminating power of light incident on a light sensor without an outside power supply. The light is converted conventionally to a pulse train, the frequency of which varies as the illuminating power. During conversion t... | 02/17/1987 |
| 4638152 | Photoelectric converting circuit having a low parasitic capacitance A bootstrap negative feedback type photoelectric converting circuit for converting an optical signal into an electrical signal. A light receiving element receives incident light and provides an electrical signal to a field effect transistor (FET) and an i... | 01/20/1987 |
| 4636655 | Circuit in which output circuit and operational amplifier equipped input circuit are electrically isolated A full wave rectifying circuit which has an operational amplifier, the noninverting input terminal of which is connected to ground and to the inverting input terminal of which an AC input voltage Vin is applied. Also included are two opposite polarity LED... | 01/13/1987 |
| 4628303 | Visual monitor for electrical signals A circuit for monitoring the status of electrical signals, such as those present on the control and data lines of an RS-232 interface, includes a single operational amplifier and a dual-color LED indicator. The electrical characteristics of the LED's form... | 12/09/1986 |
| 4626878 | Semiconductor optical logical device A semiconductor optical logical device comprises two light-emitting elements (2a, 2b) formed on one main surface of a transparent substrate (1), and two light sensitive elements (3a, 3b) formed on the other main surface faced to the light emitting element... | 12/02/1986 |
| 4625182 | Optically triggered bulk device Gunn oscillator A high power solid state source of microwave and millimeter wave signals is provided by an optically triggered body of bulk semiconductor material selected from the Group III-V compounds including GaAs, Cr:GaAs, and Fe:InP and having a relatively long gap... | 11/25/1986 |
| 4621204 | Sensor integrator system A sensor-integrator circuit having a sensor for producing a current varying in accordance with the sensed parameter or a reference current source, a comparator having inverting and noninverting inputs and an output and charge storage device coupled to the... | 11/04/1986 |
| 4612438 | Light intensity sensor providing a variable output current A light intensity sensor includes a variable-voltage opto-electronic generator adapted to deliver to the terminals of a load resistor a voltage varying as a function of the variable light intensity detected by the sensor. A reference voltage generator is ... | 09/16/1986 |
| 4611123 | High voltage analog solid state switch A high voltage analog solid state switch is disclosed which includes a pair of MOS FET's 10 and 20 having commonly coupled sources 11 and 21 and commonly coupled gates 13 and 23. A photovoltaic generator 30 and an opto-coupler 40 are connected in parallel... | 09/09/1986 |
| 4600847 | Predistortion equalizing circuit A predistortion circuit that cancels second order distortion of light emitting diodes enabling interference free transmission of multiple vestigial sideband television channels through a single optical fiber. This is achieved by preamplifying a signal wit... | 07/15/1986 |
| 4599527 | Device for stabilizing gain of a photosensitive avalanche member Gain of a photosensitive avalanche member, such as an avalanche photodiode, is stabilized so that a variation in gain of the photosensitive member in terms of temperature is compensated for by applying to the photosensitive member a bias voltage varying w... | 07/08/1986 |
| 4598198 | Automatic power control for modulated LED photoelectric devices A pulsed light emitting diode used as the light source in a photoelectric scanner is operated from a secondary power source which automatically adjusts the power to the LED approximately inversely proportional to frequency as the modulating frequency of t... | 07/01/1986 |
| 4596048 | Optically isolated contention bus Optical isolation means electrically isolates the electrical network ground of a logical contention bus from a transmitter coupled to the bus and having a local logic ground and a receiver coupled to the bus and having a remote logic ground. Optical isola... | 06/17/1986 |
| 4585934 | Self-calibration technique for charge-coupled device imagers A self-calibration technique which provides detector responsivity normalization for a charge-coupled device, hereinafter referred to as CCD, area imager. The CCD area imager is designed such that the detectors can be electrically decoupled from CCD multip... | 04/29/1986 |
| 4580293 | Circuit arrangement for driving a current-controlled component In a circuit arrangement for driving a current-controlled component, the current-controlled component, a controllable resistance and a current source are arranged in series. A current branch including a capacitor is arranged in parallel with the series ar... | 04/01/1986 |
| 4578595 | Circuit arrangement for drive of a thyristor with light A circuit arrangement for drive of a thyristor with light comprises a zero pause control which permits an ignition of a thyristor only in a proximity of a zero point of the thyristor voltage. The control contains an IGFET which transports away a base curr... | 03/25/1986 |
| 4578596 | Circuit arrangement for driving a thyristor with a phototransistor In a circuit arrangement for drive of a thyristor with a phototransistor, the collector-emitter path of the phototransistor is between one of two alternating voltage terminals and a gate terminal of the thyristor. In order to prevent an activation of the ... | 03/25/1986 |
| 4571506 | LED Driver Circuit A driver circuit turns an LED `on` and `off` in response to input logic `one` and `zero` data signals. A current regulator 11 is series coupled with the LED and serves to maintain a constant current to the LED over time, temperature, and supply voltage va... | 02/18/1986 |
| 4570079 | rf Switching apparatus utilizing optical control signals to reduce spurious output An rf multiplexer includes a plurality of rf switch assemblies for switching a selected rf signal to an output in response to an optical control signal. Each rf switch assembly includes a switch circuit mounted in a conductive enclosure. The optical contr... | 02/11/1986 |
| 4568834 | High voltage solid state multiplexer A high voltage multiplexer comprising as the switching elements for each nnel thereof a pair of series connected double diffused metal oxide semiconductor transistors connected source-to-source to obtain very high `off` resistance, with optical links com... | 02/04/1986 |
| 4564770 | Solid state relay with fast turnoff A solid state relay having a light-emitting diode, an array of series connected photodiodes, a field-effect-transistor (FET) and optically controlled switch for FET turn off is described. The light-emitting diode is optically coupled to the array of photodiode... | 01/14/1986 |
| 4558307 | Reminder device A box formed with an aperture in which a photosensitive cell is secured includes an electronic circuit connected to be fed by the electrical signal produced by the photosensitive cell when the latter is irradiated by ambient radiation. Said electronic cir... | 12/10/1985 |
| 4556789 | Measuring circuit for photo-receiving intensity of photosensor A measuring circuit for measuring the light intensity received by a photosensor comprises a photosensor which generates photocurrent proportional to the intensity of received light, an integration circuit for integrating the photocurrent generated and for... | 12/03/1985 |
| 4554463 | Trigger circuit for solid state switch The power dissipated, in a trigger circuit for gating on a semiconductor switch, is minimized by employing a constant current source to provide the gate trigger current. This assures adequate triggering regardless of supply voltage variations or switch in... | 11/19/1985 |
| 4553041 | Monolithic zero crossing triac driver A monolithic, light-activated zero-crossing triac driver is provided that includes back-to-back thyristors, whose gates are shunted by both a resistor to reduce the overall sensitivity and a first field effect transistor. A second field effect transistor ... | 11/12/1985 |
| 4551640 | Dual electronic switching device with reduced external terminals Electronic switching device comprising external terminal means for connecting the switching device with an external power source and with a load, detection circuit means for developing a detection signal, exclusive-or circuit means including a first input... | 11/05/1985 |
| 4551068 | Duplex pump controller A 100% solid state, liquid level control circuit which utilizes printed board construction with integrated circuits to control duplex pumps. Mercury switches provide information to the solid state, non-inductive input interface circuitry which relays this... | 11/05/1985 |
