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US 11,239,018 B2Granted
Inductors with compensated electromagnetic coupling
AssigneeMarvell Asia Pte Ltd
InventorsMarco Garampazzi, Matteo Pisati
Life of this patent
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Abstract
The present invention is directed to electrical circuits. and more specially, inductor designs that reduce on-chip electromagnetic coupling in certain applications. In a specific embodiment, the present invention provides an inductor that includes coils that are configured to generate magnetic fields of opposite polarities. The electromagnetic fields generated by the inductor coils substantially cancel out with each other, thereby minimizing parasitic inductance of the inductor and reducing interference with operations of other components in an integrated circuit. There are other embodiments as well.
Claims24
An inductor comprising:
- a main coil configured to direct a current in a first direction to generate a first electromagnetic field, the main coil comprising a first winding configured to direct the current in the first direction, the main coil further comprising a second winding connected in series with the first winding, and the second winding being configured to direct the current in the first direction;
- a first side coil connected to the main coil at a first side, the first side coil configured to direct the current in a second direction to generate a second electromagnetic field;
- and
- a second side coil connected to the main coil at a second side, opposite to the first side, the first side coil configured to direct the current in the second direction to generate a third electromagnetic field,
- wherein a length of the first side coil and a length of the second side coil are equal to a length of the first winding.
2 more elements
A voltage-controlled oscillator device comprising:
- an input voltage terminal configured to receive an input voltage;
- a first inductor connected to the input voltage terminal and including a first array of coils, the first array of coils including a first coil and a second coil, the first coil being connected to the second coil being via a first crossover, and the first coil and the second coil being characterized by opposite electromagnetic field directions;
- a second inductor connected in series with the first inductor and to the input voltage terminal and the first inductor;
- a first capacitor connected parallel to collectively connect the first inductor and the second inductor such that a first terminal of the first capacitor is connected to an output of the first inductor and a second terminal of the first capacitor is connected to an output of the second inductor;
- a first transistor comprising a first drain and a first gate, the first drain being connected to the first inductor and the first capacitor;
- and
- a second transistor comprising a second drain and a second gate, the second drain being connected to the second inductor and the first gate, the second gate being connected to the first drain and the first inductor.
4 more elements
An inductor comprising:
- a main coil configured to direct a current in a first direction to generate a first electromagnetic field;
- a first side coil connected to the main coil at a first side, the first side coil configured to direct the current in a second direction to generate a second electromagnetic field;
- a second side coil connected to the main coil at a second side, opposite to the first side, the first side coil configured to direct the current in the second direction to generate a third electromagnetic field;
- and
- an inner coil configured to direct the current in the second direction, the inner coil being positioned inside the main coil.
2 more elements
An inductor comprising:
- a main coil configured to direct a current in a first direction to generate a first electromagnetic field;
- a first side coil connected to the main coil at a first side, the first side coil configured to direct the current in a second direction to generate a second electromagnetic field;
- a second side coil connected to the main coil at a second side, opposite to the first side, the first side coil configured to direct the current in the second direction to generate a third electromagnetic field;
- an inner coil comprising an input and an output and configured to direct the current in the first direction, the inner coil being positioned inside the main coil and being continuous from the input of the inner coil to the output of the inner coil;
- and
- a crossover connecting the input and the output of the inner coil to the main coil.
3 more elements
Dependencies are inferred from the claim text.