Transistor oscillator and amplifier grids

Article Abstract:

Recent developments in quasi-optical power combining are reviewed, focusing on planar periodic grids and their use as quasi-optical active components. Grids of different sorts are used to generate and amplify electromagnetic radiation, and while quasi-optical techniques can be applied to a range of solid-state devices, special attention is given to transistors, which are attractive because they can be used both as amplifiers and oscillators. Use of MESFET bar-grid and planar grid oscillators is studied, and a MESFET grid amplifier that receives only vertically polarized waves at the input and that radiates horizontally polarized waves at the output is described. These planar grids can be scaled for operation at millimeter- and submillimeter-wave frequencies. Planar grid oscillators and amplifiers with thousands of devices can be created using modern integrated circuit fabrication techniques, which is an efficient method of large-scale power combining.

Integrated circuits, Industrial research, Technology, Telecommunications, Product introduction, Research and Development, Communications Technology, New Technique, Amplifiers, Communications Circuits, Optical Communication

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The synchronous approach to reactive and real-time systems

Article Abstract:

The synchronous approach to reactive and real-time programming is discussed with regard to its principles and application fields. Application fields include pure task sequencers, communication protocols, low level signal processing, industrial process control, complex signal processing systems, complex control-and-monitoring systems and C3-systems. The major concern of the synchronous approach is to use mathematical models as the foundation for synchronous programming languages. Such models lead to clean and precise methods of handling compilation, logical correctness proofs and verifications of real-time programs. The synchronous approach is discussed in detail.

Programming languages, Mathematics, Real time systems, Models, Programming Language, Real-Time System, Scientific Research, Methods

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The regenerative receiver and the synchronous oscillator

Article Abstract:

The sensitivity of a regenerative receiver and a synchronous oscillator is inversely proportional to the input signal level. For the regenerative receiver, when noise is high, stability and selectivity are poor. The synchronous oscillator functions during stable oscillations, when selectivity is good and noise is low.

Receiver, Signal to Noise Ratio

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