Abstract: A phase space locked loop system used for performing indirect frequency modulation. A phase locked loop is comprised of a phase detector coupled to a low pass filter coupled to a voltage controlled oscillator with a feedback loop to the phase detector. Input signals provided by a crystal controlled oscillator are fed to the phase detector. A phase difference other than 90.degree. between the voltage controlled oscillator output and the input signal will result in the phase detector generating an error voltage which is filtered by the low pass filter to alter the voltage controlled oscillator until its phase is 90.degree. from the input signal. A modulating signal is injected into the phase locked loop which causes the voltage controlled oscillator to momentarily change frequency until the output of the phase detector changes enough to balance the modulating signal.

Abstract: A current controlled ring oscillator is utilized in a phase locked loop system. The ring itself is comprised of lateral pnp current sources and Schottky clamped npn transistors to provide a frequency range of 4 megahertz at 50 microamp drive to 43 megahertz at 1 milliamp drive. The frequency of the ring oscillator is varied by varying the current injected into the ring.

Abstract: A magnetic bubble domain memory device is provided that includes a magnetic domain data chip having a major-minor loop organization with on-chip firmware providing redundancy information enabling the use of the chip even though one or more defective minor loops may be present thereon. The first page written in the minor loops, where a page is defined as a common bit position in each of the plurality of minor loops, presents a series of magnetic domains and voids where the magnetic domains represent the operable minor loops and the voids represent the defective minor loops. The second page in the minor loops is a series of magnetic domains and voids separated into bytes of information which are representative of the loop numbers of defective minor loops on the chip, and a third page in the minor loops is a repetition of the first page of data. Collectively, the three pages comprise the on-chip firmware providing redundancy information.

Abstract: A magnetic bubble memory organization comprising a plurality of magnetic bubble memory chips arranged in rows and columns to form a matrix. Each chip has a plurality of memory locations for storing magnetic bubbles, selectively operable components for transferring magnetic bubbles out of and into memory locations for the retrieval and storage of information, a selectively operable replicator and annihilator of magnetic bubble information transferred out of memory locations on the chip, a generator selectively operable for producing magnetic bubbles for storage in memory locations on the chip, and a detector for sensing the presence of magnetic bubbles transferred out of memory locations and for providing an electrical output signal in response to the detection thereof. First transfer electrical control signals are respectively commonly applied to the first transfer components on all chips in each of the respective columns of the matrix for their simultaneous actuation.

Abstract: Acoustic surface wave resonator device having two sets of reflector arrays on a piezoelectric substrate with structurally modified coupling transducers interposed therebetween, wherein the transducers are coupled to the standing wave resonance in the resonance cavity but are respectively decoupled from the surface wave launched by the other transducer, thereby suppressing direct coupled response without materially affecting the resonance response. In a typical embodiment, a pair of interdigital transducers are disposed between two sets of reflector arrays on a piezoelectric substrate, with the fingers of the respective transducers including intermediate off-set portions thereof. Specifically, the intermediate off-set portion in each interdigital finger extends over a distance .lambda./4, with the space between successive fingers in a transducer being .lambda./2.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: A microwave amplifier is disclosed using a nonreciprocal three port junction circulator. The amplifier uses a ferrite circulator having an input port, an output port and a third electrical port. A semiconductor device such as an IMPATT diode having negative resistance is located adjacent and electrically coupled to the third electrical port. The negative resistance of the IMPATT diode combines with the output response of the third electrical port of the circulator to provide power amplification of microwave signals received on the input port.

Abstract: A transform structure employing surface wave devices performs Fourier transform operations on a time-limited substantially band limited signal. The output signal of the transform structure is related to the Fourier transform of the input signal in a manner which permits forming the product of this output with a similar output of a second transform structure. This product is inverted by a third transform structure so as to provide the convolution of the two original input functions. The overall structure comprises a filter apparatus readily programable in either the time or frequency domain.