Monolithic active filters at microwave frequencies

Article Abstract:

Conventional L-C filters can cause problems in integration into monolithic form as the inductors take large amounts of chip areas and only offer low Q values. The RF active filter approach is an alternative, and a technique is described that expands on previously reported work. Fully-monolithic silicon devices were used, with the addition of silicon-on-insulator (SOI). The advantage of low-power, monolithic, selective-gain amplifiers is that low-cost receivers can be designed for a small silicon area.

Silicon-on-isolator, Silicon-on-insulator

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Design rules for fluxless soldering

Article Abstract:

Most commercial soldering operations require the use of fluxes, but fluxes are unsuitable for use in certain applications. All soldering of hybrids for space electronics circuitry must be undertaken without the use of fluxes, and measures need to be taken to avoid oxide formation and to allow wetting and spreading of the solder. Gold is often the preferred choice of finish, especially where the use of chemical fluxes is excluded. Indium based solders can be more tolerant to gold metallizations.

Solder and soldering, Soldering, Solders

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Power splitting and combining techniques on MMICS

Article Abstract:

Power splitting and combining techniques are an aspect of power amplifier design using monolithic microwave integrated circuits (MMICs). The characteristics of available MMIC devices are described, and the way in which the layout of parasitic components restrict the maximum size of individual devices is discussed. The Wilkinson, bus-bar and parallel matching networks are the most commonly used MMIC power splitters and combiners.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Microwave Integrated Circuits

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