Abstract:
A circuit for supplying pulse energy to a load such as a laser. The circuit is energized from a three phase supply. One channel operates on the crests of the phase voltages supplied while a second channel operates on the crests of the phase to phase voltages. The circuit provides, in effect, multiple phase rectification in a line type pulser operation without a rectifying transformer.
Abstract:
An improved method of flip-chip mounting a semiconductor device, such as a transistor, on a pattern of electrical conductors carried on an insulating substrate, comprising providing the device chip with a glass protective layer and on the glass layer metallized bonding pads adjacent to the corners of the chip. Each of the bonding pads includes a relatively wide portion adapted to contain a relatively high mound of solder, and a second portion of a relatively narrow width capable of holding only a thin layer of solder. The thin solder layers overlie heat-generating P-N junction portions of the device. The conductors on the substrate have solder-wettable portions of larger areas than the bonding pads on the chip. Solder balls are placed on the wide portions of the bonding pads and melted to reflow the solder. The chip is then placed face down over the conductors on the substrate and the solder is again reflowed so that the relatively high mounds collapse to the thickness of the thin solder layer portions and the relatively thin solder layer portions are joined directly to the substrate conductors.
Abstract:
A universal data quality monitor selectively samples any of a plurality of differently modulated signals, each of which may have any of a plurality of different data rates, for monitoring the amount of jitter in the sampled signal.
Abstract:
Binary coded designator labels fixed to articles which they identify are scanned and the signals thereby obtained are employed to produce clock pulses. Various circuits are included for checking the accuracy of signals read from a label and for distinguishing them from marks or other data on the article.
Abstract:
An analog phase tracker includes a phase tracking loop comprising a phase detector, a voltage controlled oscillator, a plurality of dividers and at least one multiplier for altering the phase of the voltage controlled oscillator output solely by dividing the oscillator output phase by the product of all of the dividers, while altering the frequency of the voltage controlled oscillator output by both dividing the frequency by the product of the divisors and multiplying the frequency by an integer equal to at least one of the divisors such that the frequency and phase of a signal derived by the dividers and multipliers is substantially the same as an applied periodic signal whose repetition rate may be any one of plurality of predetermined values.
Abstract:
An input diplexer separates wide frequency range signals by frequency to provide, at a plurality of outputs, signals within different narrow frequency bands. A plurality of quadrature hybrids are adapted so that each hybrid achieves equal power division and 90* relative phase shift with low distortion over one of the narrow frequency bands. A hybrid is coupled to each output of the input diplexer. Output diplexers are coupled to the two outputs of each of the hybrids to combine the power divided narrow frequency band signals into two wide frequency band signals of substantially equal power and of 90* differential phase.
Abstract:
Each of first and second grounded-emitter amplifier transistors has a diode connected between its collector electrode and the base electrode of the other to provide a storage flip-flop. Third and fourth transistors have collector electrodes, each coupled to a source of triggering pulses by similar resistors; cross-coupled collector and base electrodes; and emitter electrodes, each connected to a separate one of the base electrodes of the first and second transistors and each connected to ground reference potential by a resistor. So connected, the third and fourth transistors provide a commutating flip-flop, functioning as a steering network for trigger pulses and providing for short term memory of the previous state of the storage flip during its transition in response to a triggering impulse. The use of diodes to cross-couple the collector and base electrodes of the first and second transistors in the storage flip-flop permits fast transitions of the storage flip-flop despite the use of pinch resistor collector loads for the first, second, third and fourth transistors and restricted amplitude triggering pulses, which are employed to reduce power consumption of the direct-coupled triggered flip-flop.
Abstract:
Different values of resistance are sequenced into an attenuator network to vary the amplitude of a video signal applied to a single-gun cathode-ray tube color television receiver to offset differences in phosphor efficiency and control the proportionality of reproduced white obtained.
Abstract:
Virtual image readout of relatively high intensity is obtained by employing two readout beams, one following the path of the reference beam and the other following the path of the object beam, and modulating at least one of the beams. Amplitude, intensity or phase modulation may be employed.
Abstract:
An internally-modulated laser in which first, second and third reflectors and a polarization means are oriented with respect to each other both to provide a first optical resonant cavity, defined by the first and second reflectors, and a second optical resonant cavity, defined by the first and third reflectors. A laser medium is located in the common portion of the cavities between the first reflector and the polarization means, and an individual data-signal-responsive modulator is situated in each respective individual portion of the cavities between the polarization means and the respective second or third reflector. The first cavity supports a given polarization and the second cavity supports a polarization orthogonal to the given polarization. The modulated output wave energy provided by this apparatus includes two separate orthogonally polarized data channels.