Hazeltine Corporation

Richard LaRosa

Frederick W Freyre

A local R.F. ground plane for high frequency active device. The R.F. grounded terminal of each active device is connected directly to its local R.F. ground plane. In the case of a transistor, there are common emitter, common base, or common collector circuits. The common electrode or terminal is connected directly to the local R.F. ground plane. In the case of a FET, the common electrode can be the source, gate or drain. In the case of a thermionic vacuum tube, the common electrode can be the cathode, grid or plate. In the case of a vacuum microelectronic device, the names are still evolving. The local R.F. ground is bypassed to the case of the package near the local R.F. input and/or output connections. This design permits double bond wires from the emitter to the local R.F. ground plane and eliminates parasitic oscillations where the potential oscillation frequency of the active device being protected is at least twice as great as the operating frequency of the package.

Local ground plane for high frequency circuits

Coherent light is incident upon an acousto-optical cell through which bulk acoustic waves are propagating. These acoustic waves correspond to a signal to be detected and cause periodic variations in the refractive index of the cell which interact with the coherent light. Acoustic frequency components of the propagating waves cause the cell to diffract beams of incident coherent light in a unique direction and to frequency shift each beam of diffracted light. The relative phases of the acoustic frequency components are also imparted to the respective diffracted light beams. Diffracted and undiffracted coherent light beams are recombined so that optical heterodyning takes place. The recombined light beams are focused by a Fourier Transform lens onto a photomixer which detects the frequency difference between the diffracted and undiffracted light beams. By detecting the recombined light beams with a photomixer array or, by deflecting the position of the undiffracted light or by amplitude or phase modulating the undiffracted light, a channelized coherent acousto-optical receiver is achieved which may function as part of a rapidly tunable bandpass filter.

Acousto-optical channelized processor

An improved constant-envelope, angle-modulated pulse signal generator makes use of first and second bi-phase amplitude modulators, each for modulating a carrier with supplied pulse signals. The pulse signals are representative of information and are interleaved with each other. The pulse duration is selected to cause a suitable amount of pulse overlap. When the modulated carriers are combined in phase quadrature and passed through a surface acoustic wave filter, they form a constant envelope signal. Appropriate selection of parameters can yield a sinusoidal frequency shift keyed (SFSK) signal.

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South Hempstead, NY, United States of America

Richard LaRosa