Telefonaktiebolaget Lm Ericsson (Publ)

Bertil Hansson

Spartak Gevorgian

Harald Jacobsson

Thomas Lewin

H&aring;kan Berg

Omid Aval

A method of locking a first differential oscillator with a second differential oscillator and a circuit and an arrangement therefor. The method comprises AC coupling a fundamental frequency AC-ground of the first differential oscillator with a fundamental frequency AC-ground of the second differential oscillator.

Oscillator having an AC-coupling between fundamental frequency ground points

A printed circuit ( ) on a lossy substrate ( ) has been provided whereby intermediate structures ( ) under the top layer strips ( ) have been formed having a width being (d ) smaller than the width (w) of the strip. The intermediate structures ( ) are particular well suited for inductors ( ) on silicon substrates and result in a considerable increase in the Q-factor of the inductor at microwave frequencies.

Micro-strip circuit for loss reduction

A balanced inductor formed on lossy substrate material having adjacent strips leading current in opposite directions and being arranged in such a way that substrate currents relating to individual strips (,) induced in the lossy substrate (,) are balancing out one another leading to high Q-values. The inductor structure according to the invention can be implemented in MMIC devices using standard semiconductor substrates and do not require any special treatment of the substrate being needed.

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Agnesberg, Sweden

Bertil Hansson