Sdrf Eurl

Vanessa Bedero

Biagio Bisanti

Stefano Cipriani

Francesco Coppola

Lorenzo Carpineto

Gianni Puccio

Eric Duvivier

Rémi Artinian

Francois Marot

Lysiane Koechlin

Variable frequency oscillators allowing wide tuning range and low phase noise is disclosed. In an illustrative embodiment, a first transistor has a first terminal (e.g. collector) connected to a reference voltage, and a second terminal (e.g. emitter) connected to a first terminal of a first current source and to ground. The first transistor further has a third terminal connected to a first inductor and to a first capacitor connected to the emitter of the first transistor and also to a second capacitor connected to ground. A second transistor is similarly constructed. In order to achieve a variable frequency oscillation between the emitters of the two transistors, a variable tank capacitor is connected between the inductors, forming a circuit connecting in series all passive components composing the LC tank, masking most of parasitic capacitances.

Variable frequency oscillator having wide tuning range and low phase noise

Multi-loop PLL structure for generating an accurate and stable frequency over a wide range of frequencies

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Vence, France

Vanessa Bedero