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US 12,603,609 B2Granted
Quadrature oscillator
AssigneeSTMicroelectronics International N.V.
InventorsFlorence Giry-Cassan, Antoine Ranieri
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Abstract
The present description concerns a device comprising two oscillators coupled to each other so as to operate in quadrature, each oscillator comprising an inductor and a capacitive element having a value selectable from among at least two values, each corresponding to an operating frequency value of the oscillators, each oscillator being configured so that, for each operating frequency value of the oscillators, the quality factor of its inductor is lower than the quality factor of its capacitive element.
Claims20
A device comprising:
- two oscillators coupled to each other, the two oscillators being configured to operate in quadrature, each oscillator comprising an inductor and a capacitor, the capacitor comprising a value selectable from among at least two values, each corresponding to an operating frequency value of the oscillators, each oscillator being configured so that, for each operating frequency value of the oscillators, the quality factor of its inductor is lower than the quality factor of its capacitor, wherein, in each oscillator, the inductor comprises:
- identical first and second windings, the first winding having a first end coupled to a first node of application of a power supply potential and a second end coupled to a second output node of the oscillator, and the second winding having a first end coupled to the first node and a second end coupled to a third output node of the oscillator, a first electrode of the capacitor being connected to the second output node and a second electrode of the capacitor being connected to the third output node;
- and
- a first resistor series-connected to the first winding between the first node and the second output node and a second resistor series-connected to the second winding between the first node and the third output node, the first and second resistors having a same resistance value, each of the first and second resistors comprising:
- at least one polysilicon portion;
- a first conductive portion of a first metal level of an interconnection structure, the first conductive portion corresponding to a first terminal of the respective resistor;
- a second conductive portion of the first metal level corresponding to a second terminal of the respective resistor;
- at least one third conductive portion of a second metal level of the interconnection structure;
- at least one fourth conductive portion of the second metal level;
- first conductive vias electrically coupling the first conductive portion to the at least one third conductive portion and the second conductive portion to the at least one fourth conductive portion;
- and
- second conductive vias electrically coupling the at least one polysilicon portion to the at least one third conductive portion and to the at least one fourth conductive portion.
9 more elements
A device comprising:
- two oscillators coupled to each other, the two oscillators being configured to operate in quadrature, each oscillator comprising an inductor and a capacitor, each respective inductor comprising respective first and second windings and a respective resistor, the respective first winding having a respective first end coupled to a respective first node of application of a power supply potential and a respective second end coupled to a respective second output node of the oscillator, the respective second winding having a respective first end coupled to the respective first node and a respective second end coupled to a respective third output node of the oscillator, a respective first electrode of the respective capacitor being connected to the respective second output node and a respective second electrode of the respective capacitor being connected to the respective third output node, and each oscillator being configured so that, for each operating frequency value of the oscillators, the quality factor of its respective inductor is lower than the quality factor of its respective capacitor, the respective resistor being series-connected to the first winding between the respective first node and the respective second output node, the respective resistor comprising:
- at least one polysilicon portion;
- a first conductive portion of a first metal level of an interconnection structure, the first conductive portion corresponding to a first terminal of the respective resistor;
- a second conductive portion of the first metal level corresponding to a second terminal of the respective resistor;
- at least one third conductive portion of a second metal level of the interconnection structure;
- at least one fourth conductive portion of the second metal level;
- first conductive vias electrically coupling the first conductive portion to the at least one third conductive portion and the second conductive portion to the at least one fourth conductive portion;
- and
- second conductive vias electrically coupling the at least one polysilicon portion to the at least one third conductive portion and to the at least one fourth conductive portion.
6 more elements
A device comprising:
- two oscillators coupled to each other, the two oscillators being configured to operate in quadrature, each oscillator comprising an inductor and a capacitor, each oscillator being configured so that, for each operating frequency value of the oscillators, the quality factor of its inductor is lower than the quality factor of its capacitor, the inductor comprising at least one resistor, the resistor comprising:
- a portion of non-doped polysilicon on a semiconductor substrate;
- a first conductive portion of a first metal level of an interconnection structure, the first conductive portion corresponding to a first terminal of the resistor;
- a second conductive portion of the first metal level corresponding to a second terminal of the resistor;
- at least one third conductive portion of a second metal level of the interconnection structure;
- at least one fourth conductive portion of the second metal level;
- first conductive vias electrically coupling the first conductive portion to the at least one third conductive portion and the second conductive portion to the at least one fourth conductive portion;
- and
- second conductive vias electrically coupling the portion of non-doped polysilicon to the at least one third conductive portion and to the at least one fourth conductive portion.
6 more elements
Dependencies are inferred from the claim text.