Abstract: In the present invention, channel charge compensation is achieved in a MOS switch comprising two MOSFETs connected in parallel and a compensating MOSFET placed on the semiconductive substrate in precise symmetry with the two switching FETs, each of the FETs being designed to have the same channel charge storing capacity. Accordingly, first order variations in oxide thickness or in gate width across the surface of the semiconductive substrate do not affect the accuracy with which channel charge is compensated in the invention. The compensating FET is switched in complementary fashion with the two switching FETs so that it absorbs one-half of the channel charge expelled from the switching FETs when they are turned off, thus preventing this charge from upsetting other components in the circuit such as precision storage capacitors connected to the switch.

Abstract: A tubular ring-bar slow wave structure is provided. The structure includes a plurality of axially spaced, coaxially aligned, generally parallel metallic rings connected by a plurality of generally axially parallel, alternately spaced metallic bars. The structure also includes a plurality of axially spaced, coaxially aligned, generally parallel dielectric support rings, each of which has a width that is narrower than the width of a metallic ring.

Abstract: The auto-zeroing technique of this invention comprises two steps. In the first step, the differential amplifier output and negative input are shorted together and the resulting amplifier offset output voltage is stored across an input capacitor and a feedback capacitor, the input capacitor being connected between the amplifier negative input and a voltage source to be sampled and the feedback capacitor being connected between the amplifier negative input and ground. In the second step, the direct connection between the amplifier output and negative input is removed and the feedback capacitor is reconnected between the amplifier output and negative input in a feedback loop. At this time, a voltage of the same magnitude and opposite polarity as the original amplifier offset output voltage is applied as negative feedback across the amplifier, so that the amplifier offset output voltage is precisely zeroed. In an alternative embodiment, the connection and reconnection steps are performed at a frequency f.sub.

Abstract: This invention is a light valve using birefringent nematic liquid crystals in which compensation for residual birefringence is achieved by passing light through two separate liquid crystal layers having their major optical axes twisted oppositely along an axis parallel to the direction of light propagation and aligned perpendicular to one another at the interface between the two liquid crystal layers.

Abstract: An NMOS non-volatile latch having N-channel drivers Q.sub.1 and Q.sub.2 and variable threshold N-channel FATMOS transistors Q.sub.3 and Q.sub.4 as depletion loads. The control gate of each FATMOS transistor is coupled to its own node (X.sub.1 or X.sub.2) so as to operate in depletion, whereas to obtain the correct voltage stresses the tunnels of the FATMOS floating gates are cross-coupled to the opposite latch nodes.

Abstract: There is herein described an electrical switch which is manually or mechanically moved from one position to another in order to change the electrical conductivity between one or more of its terminals and one or more of the other of its terminals, the invention including a unique member that is deformed by the manipulation of an actuation member and that toggles into a stable and less deformed configuration to make the desired electrical contacts.

Abstract: There is herein described a blanking press in which a punch is moved upwardly under pressure to engage a sheet workpiece and pass through a punch-conforming die plate aperture, the press housing including a product retrieving and operator-viewing opening in the upper end thereof to allow an operator to directly view the alignment of the workpiece relative to the die opening and the operation of the press by looking in a downward direction.

Abstract: The specification discloses a gas compressor incorporating a rotating wheel with cavities therein, the cavities transferring gas into a chamber of elevated pressure while simultaneously using the cavities to transfer a liquid out of that chamber.

Abstract: A comparator for comparing the relative magnitudes of first and second voltages and for providing a binary output indicative of which of the voltages is the greater. The voltages are applied sequentially to a capacitor during first and second periods respectively. An inverter has its input connected to the capacitor, and a voltage bias source applies a bias voltage to the input of the inverter in such a manner as to cause the output of the inverter to assume a predetermined voltage during the first period and a voltage either greater or less than the predetermined voltage during the second period, depending upon whether the first voltage is greater or less than the second voltage. A flip-flop is connected to the output of the inverter such as to be either set or reset in response to the output of the inverter being greater or less than the predetermined voltage during the second period.

Abstract: A folded end-coupled general response TE.sub.011 filter is herein described which achieves all bridge couplings necessary for general bandpass response in a particularly convenient two-tier overlapping structure, where all couplings are made in a single removable iris, and where probe and/or slot couplings are used to achieve coupling of either sign.

Abstract: There are herein described evanescent mode filters each of which include a hollow waveguide, wherein a plurality of resonators are disposed, the resonators including loading structures such as tuning screws, for example, wherein at least one of the loading structures is angularly disposed, relative to the axis of the waveguide, with respect to others of the loading structures to reduce the length of the filter and/or to provide internal bridge couplings.

Abstract: A system for precisely positioning a printed circuit board relative to a component insertion tool, the system including a circuit board-holding frame movable with two degrees of freedom in a plane by a servomechanism coupled to a photo detector assembly positioned on the opposite side of the printed circuit board from a light beam generator producing a single beam or a pair of parallel light beams spaced a distance equal to the distance between a pair of holes in the circuit board. Light pipes or a pair of orthogonally oriented wedge-shaped beam splitting members are positioned between the photo detector assembly and the circuit board for splitting each of the beams and thereby illuminating orthogonally oriented pairs of photo cells equally when the board is in a desired position relative to the light beams and providing to the servomechanism with an error signal to correct the position of the board when it is not in such alignment.

Abstract: A displacement transducer suitable for monitoring the angular rotation of an internal combustion engine is provided. The transducer comprises a rotary disc having a castellated periphery and mounted for rotation with the engine. First and second coils are mounted such that upon operation of the engine the castellations of the disc interrupt the inductive coupling therebetween. The first coil is fed with an oscillatory electrical signal which induces in the second coil an output signal of a first peak amplitude during the interruptions produced by the castellations and of a second peak amplitude during periods between the interruptions. Thresholding circuitry responsive to the output signal produces a control signal which is indicative of the commencement and cessation of the interruptions. In accordance with one disclosed embodiment, the threshold circuitry includes a pair of inverters sharing the same thermal environment.

Abstract: There is herein described a wide-band, phase scanned transmitting antenna with a greatly reduced bandwidth/scan angle limitation through the use of a time variable phase shifter coupled to the input of each phase scanned sub-array of the antenna.

Abstract: A spark timing control circuit for an internal combustion engine, includes a speed band selector circuit which responds to an electrical signal indicative of engine speed and provides an output signal indicative of which of a plurality of speed bands is occupied by the engine speed. Spark timing information for each speed band is stored in a memory as a first word in units of angular rotation of the engine for the heaviest engine operating load, and a second and third words indicative of the slope of straight line approximations to the curve of engine load plotted against advance in said angle units. A build up circuit responds to an electrical signal indicative of the engine operating load and computes from the second and third words a build up word which is added to the first word in an accumulator so as to derive an accumulated word in said angle units indicative of the desired spark timing.

Abstract: An active microwave filter for use in both bandpass and notch filter applications is herein described, the filter incorporating a distributed resonator to which is coupled an amplifier which provides a positive feedback and cancels the net dissipation in the resonator.