Telefonaktiebolaget Lm Ericsson (publ)

Hans T Lind

Kent Olof Falk

Ingmar Karlsson

Morgan Andersson

Bo S Andersson

Thomas Ridderstrale

Thomas Ridderstråle

A method of producing a digital beamformer signal by a number of antenna modules that are alike and by providing a system that implements the method. This is accomplished by introducing signal processing on each antenna module and by creating an asynchronous serial adding chain through the antenna modules to at least in part calculate the digital beamformer signal. Advantageous embodiments according to the invention perform time and space signal processing multiplexing to calculate additional digital beamformer signals.

Method and a unit for beam control of an array antenna

An integrated semiconductor circuit includes a substrate, an epitaxial layer having transistor base regions, a first and a second (11) insulating oxide layer, and a protective layer. The first oxide layer carries heavily doped polycrystalline layers, including an electric contact layer, a screening layer and a connecting layer. The connecting layer electrically connects the screening layer to the epitaxial layer, through the electric contact layer. The screening layer prevents the occurrence of inversion and parasite components in the epitaxial layer between the base regions. The polycrystalline layer arrangement is simple and can be produced in a common process step. The arrangement is able to withstand high temperatures and enables the second insulating layer to be readily applied.

Integrated circuit screen arrangement and a method for its manufacture

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Stockholm, Sweden

Hans T Lind