Inductors with compensated electromagnetic coupling
AssigneeInphi Corporation
InventorsMarco GARAMPAZZI, Matteo PISATI
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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.
Claims20
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 to the first winding, the second winding being configured to direct the current in the first direction;
- a first side coil coupled 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 couple 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.
A voltage-controlled oscillator device comprising:
- an input voltage;
- a first inductor including a first array of coils, the first array of coils including a first coil and a second coil, the first coil and the second coil being coupled to each with a first crossover connection, the first coil and the second coil being characterized by substantially opposite electromagnetic field directions;
- a second inductor coupled to a first input voltage and the first inductor;
- a first capacitor configured in parallel relative to the first inductor and the second inductor;
- a first transistor comprising a first drain and a first gate, the first drain being coupled to the first inductor and the first capacitor;
- and
- a second transistor comprising a second drain and a second gate, the second drain being coupled to the second inductor and the second gate, the second gate being coupled to the first drain and the first inductor.
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 coupled 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 couple 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.
Dependencies are inferred from the claim text.