St-ericsson Sa

Emmanuel Chataigner

Sebastien Dedieu

An oscillator () comprises a tank circuit (), a first transistor (M) and a second transistor (M), and the second transistor (M) occupies an area of silicon that is smaller than an area of silicon occupied by the first transistor (M). A switching apparatus (Sw. . . Sw) selects either one of a first oscillator topology and a second oscillator topology, where in the first oscillator topology, the tank circuit () is coupled to the first transistor (M) in a first feedback configuration to provide feedback around the first transistor (M), and in the second oscillator topology, the tank circuit () is coupled to the second transistor (M) in a second feedback configuration that is different to the first feedback configuration to provide feedback around the second transistor (M).

Oscillator having dual topology

An oscillating device is provided that has several oscillators. Each oscillator has a capacitive inductive resonant circuit and a flow-through conduction circuit having a negative flow-through conduction. The inductive elements of the oscillators are mutually coupled. Each oscillator also has short-circuit or not short-circuit the capacitive element of the oscillator. The oscillating device also has a controllable commutating means arranged to activate one oscillator at a time.

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Saint Martin, France

Emmanuel Chataigner