Abstract: A data transceiver includes a transmitter connected at one end of a data transmission line and a receiver connected at the other end of the data transmission line. At least some portions of the transceiver are formed in CMOS. A temperature compensation circuit is connected to selected components of the transceiver to correct for temperature-induced variations in currents through those components. The temperature compensation circuit includes a pair of transistors connected, respectively, in parallel conduction paths. The respective width-to-length ratios of the channels of the transistors are unequal, and their gates are tied together. The current through the larger transistor varies directly with temperature, and this current is reflected in a current mirror transistor that is connected to the shorted gates of the transistor pair.

Abstract: A test access port (TAP) controls monitoring and testing of static current IDDQ in integrated circuit (IC) devices having both a TAP of the type specified in IEEE Standard 1149.1 Test Access Port and Boundary Architecture and built-in current (BIC) monitors. BIC monitors are coupled between MOS or CMOS modules of the IC device and the low potential power rail (GND) for monitoring static current IDDQ. Bypass or shunt MOS transistors (N1,N2, . . . , NN) are coupled with primary current paths in parallel with the respective BIC monitors between the CMOS circuit modules and low potential power rail (GND). The TAP data registers (TDR's) include a design specific BIC shunt control TDR (BICSC TDR) constructed for receiving a coded BIC monitor bypass code (BICBC) at the TDI pin. BICSC TDR outputs are coupled to control nodes of the respective MOS bypass transistors (N1,N2, . . . , NN) for controlling the conducting state of the bypass transistors according to the BICBC.

Abstract: An output skew detection circuit detects and measures output skew tOSLH, tOSHL between multiple in phase common edge output signals propagated through a multiple signal driver circuit having n outputs. The output skew detection circuit senses common edge output skew across the n in phase output signals simultaneously and directly. A first logic gate has n inputs coupled to the n outputs, detects occurrence of either the first or last of the multiple common edge output signals, and generates a first skew detection edge signal at a first logic gate output. The first and last common edge output signals are the signals propagated with minimum and maximum propagation times tplhmin, tphlmin and tplhmax, tphlmax. A second logic gate has n inputs coupled to the n outputs in parallel with the first logic gate. The second logic gate detects occurrence of the other of the first and last of the multiple common edge output signals and generates a second skew detection edge signal at a second logic gate output.

Abstract: An electrostatic discharge protection (ESDP) transistor element is coupled at an input or output of an MOS integrated circuit (IC) device for protecting internal transistor elements of the MOS IC device from electrostatic discharge (ESD) dielectric breakdown voltages. A relatively thick passivating layer of low temperature deposited passivating material is deposited over the active area between the channel and gate of the ESDP transistor element. A metal layer gate is formed over the passivating layer. The channel insulating layer thickness provides a turn on voltage V.sub.TON less than the dielectric breakdown voltage BVGOX of internal transistor elements. The bond pads of the MOS IC device are used for the metal layer gates and the metal layer gate bond pads are formed over the active area of the ESDP transistor elements.

Abstract: A voltage translator is provided that translates a lower voltage to a higher voltage, for example, a 3.3 V voltage to a 5.0 V voltage. The 3.3 V voltage is received on source/drain terminal N1 of an NMOS transistor. The transistor gate is at 3.3 V. The other source/drain terminal N2 of the transistor is connected to an input of a CMOS inverter powered by 5.0 V. The inverter output is connected to the gate of a PMOS transistor connected between 5.0 V and terminal N2. The PMOS transistor pulls terminal N2 to 5.0 V when terminal N1 is at 3.3 V. The same translator is suitable for translating a 5.0 V voltage on terminal N1 to 3.3 V on terminal N2 if the inverter is powered by 3.3 V and the PMOS transistor is connected between 3.3 V and terminal N2. Also, an output driver is provided in which a voltage protection circuitry prevents charge leakage from the driver output terminal to the driver's power supply when the voltage on the bus connected to the output terminal exceeds the power supply voltage.

Abstract: A high speed operational amplifier includes a differential amplifier input stage capable of producing a pair of complementary differential outputs. Complementary current mirrors receive the differential signals out of the first stage and combine them at a common output node for amplification by an output buffer. The circuit can be operated at low power and produces a high slew rate.

Abstract: An integrated circuit device ECL test access port (TAP) is constructed for low static current requirements and low power consumption when the TAP is inactive. The ECL test access port may conform with IEEE Standard 1149.1 Test Access Port and Boundary Scan Architecture. An SCS logic circuit (50) is incorporated in the TAP controller coupled to the flip-flops (32,34,36,38) of the TAP controller n state finite machine for generating a current sink switch control signal (SCS) according to the state of the TAP controller. A current sink switch circuit (24) is coupled to respective current sinks of ECL gates incorporated in the boundary scan register (BSR/TDR1), design specific TAP data registers (DS/TDRs), TAP instruction register (TIR), and device identification register (DIR/TDR3). The current sink switch circuit (24) has an input coupled to the SCS logic circuit (50) to receive the current sink switch control signal (SCS).

Abstract: The system for organizing communication among applications in a data processing network includes data bases and data base control means. The data bases include method entries, message entries, and class entries. Method entries refer to commands or other mechanisms used to invoke applications. Message entries each represent a type of operation which can be performed on instances in a class which correspond to that message and identify a method map which contains one or more references to method entries stored in the data base. Class entries, each of which is unique in a data base, contain information about classes consisting of instances which have common characteristics as well as identifying a corresponding group of message entries.

Abstract: A hub and spindle assembly for an interchangeable, removable disk of a disk drive. The spindle assembly includes means for driving the hub assembly, matingly attached and removably engaged thereto, so as to rotate the disk coupled to the hub. The hub assembly includes surfaces for engaging an accurately machined rotational surface of the spindle assembly and force engaging means for ensuring mating contact of the hub assembly surfaces with the spindle assembly and for ensuring removeable engagement. The hub and spindle assembly minimize runout such that the Read/Write heads track an essentially circular disk track, even if the disk is removed, reinserted or placed on a different spindle of the same type.

Abstract: A scanning system combining active and passive detection of radiation from targets. In the active mode, a laser beam is scanned with a rotating wedge in a downward looking Palmer pattern, a portion of the beam is reflected from targets, and coherent detection is performed on the returned signals. Means is disclosed for automatically compensating for misalignment between the signal return beam and local reference beam upon the coherent detector. In the passive mode, infrared radiation inherently emitted by targets is also detected.

Abstract: A transducer for a SAW device having withdrawal weighting combined with series sections weighting to achieve a desired frequency response. Withdrawal weighting is employed where the impulse response can be adequately approximated by a withdrawal pattern with series sections electrodes being used to provide the additional weighting required. Additionally, electrodes using a different number of series sections are separated by a gap a few wavelengths wide in order to avoid sharp discontinuities.

Abstract: A coherent detection scanning laser system having an optical system that compensates for the angular deviation of the received signal resulting from the scanning process, and having a detection system with output independent of spatially varying sensitivity or response of the detector caused by inhomogeneities therein.In one embodiment, the local oscillator reference signal is compensated for the lag angle and the detector is placed at the image plane of the scanning antenna, and system geometry is arranged so that the image plane of the mirror providing the compensating reference signal coincides with the image plane of the scanning antenna. In another embodiment, the received signal is compensated for lag angle and the system geometry is arranged so that the detector receives a focused signal permitting the use of a smaller area.

Abstract: A scanning laser doppler system in which the change in angle between transmitted and received beams caused by the finite transit time to the target is automatically compensated. The scanning beam is produced as a downward looking Palmer scan pattern by an expanded laser beam transmitted through a rotating wedge. The rotating wedge is tilted in accordance with the invention to align the received beam with a portion of the transmitted beam upon a detector.

Abstract: A system for the generation of a set of voltages, such as the X and Y coordinate voltages of a display or automated milling machine, includes a character generator and a character positioning circuit which, in turn, are responsive to digital control signals as are produced by a computer. A detector compares detection signals to reference signals at successive instants during the use of the system. The computer utilizes a learning routine in conjunction with voltage generation circuitry to develop the reference signals. The computer is programmed to provide specific values of the digital control signals at the times of the comparisons by the detector to detect any deviation of the magnitudes of the voltages of the deflection circuitry from the magnitudes attained during an initial alignment of the system.

Abstract: A resonance isolator in which microwave ferrite bars are positioned in and in contact with a waveguide to achieve unilateral absorption and in which ceramic permanent magnet bars are positioned on the outside of the waveguide adjacent to the ferrite bars and are insulated by a thin sheet of thermally insulating material that also acts as a spacer to adjust the magnetic field. The waveguide may be made with nonmagnetic sheet metal and the ferrite bars may be used as extruded. The isolator is adapted to connect between a microwave generator, such as a magnetron, and a microwave load, such as a heating chamber, and forms an integral feed unit. The isolator effectively reduces the peaks of the standing wave caused by the power reflected by a load and protects the generator against premature degradation and extends its useful life time.

Abstract: A four-frequency laser gyroscope system having improved accuracy is constructed using a single solid block of low thermal coefficient of expansion material. A four-segment nonplanar propagation path provides a first frequency splitting. A second splitting is provided by a Faraday rotator having a thin slab of rare earth-doped glass positioned within an aperture in a permanent magnet. A narrow angle of incidence is provided for the beams of incident upon the output mirror to prevent cross coupling between beams within the output optics structure. Blocking the gaseous flow path reduces output frequency drift caused by contamininating particles.

Abstract: A surface acoustic wave (SAW) device is provided with short-term and long-term stability by recessing the electrode structure into the surface of the piezoelectric crystal of the device. In addition, the surface is passivated with the silicon polymer, and a cover of the same crystalline material is placed above the electrode structure to prevent absorption of impurities into the surface from the atmosphere. The passivation is believed to reduce the effect of thermal agitation of the bonds of the crystal lattice structure, and thereby prevent the making and breaking of chemical bonds with hydroxyl ions that may have been entrapped from the atmosphere. The SAW device is particularly useful in the construction of stable oscillator circuits wherein the passivation provides improved short-term frequency stability and the cover provides long-term frequency stability.