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US 2006/0220737 A1Published application
High q monolithic inductors for use in differential circuits
AssigneeInternational Business Machines Corporation
InventorDavid Sanderson
Life of this patent
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Abstract
The present invention provides a differentially driven monolithic inductor circuit having a shield differentially driven by phase shift buffers and a single-ended monolithic inductor circuit having single-ended shields driven by phase shift buffers, both inductor circuit types providing high Quality factor (Q) at operating frequencies in the multi-GHz range and circuits incorporating the same.
Claims20
A circuit comprising:
- a monolithic inductor having first and second ends, the first end adapted to receive a positive signal of a differential signal, the second end adapted to receive a negative signal of the differential signal;
- a first buffer adapted to receive the positive differential signal and output a phase-shifted version of the positive differential signal;
- a second buffer adapted to receive the negative differential signal and output a phase-shifted version of the negative differential signal;
- and
- a shield positioned between the monolithic inductor and a substrate, the shield having first and second segments, the first shield segment adapted to receive the phase-shifted output of the second buffer, the second shield segment adapted to receive the phase-shifted output of the first buffer.
2 more elements
A circuit comprising:
- a first monolithic inductor adapted to receive a positive signal of a differential signal;
- a second monolithic inductor adapted to receive a negative signal of the differential signal;
- a first buffer adapted to receive the positive differential signal and output a phase-shifted version of the positive differential signal;
- a second buffer adapted to receive the negative differential signal and output a phase-shifted version of the negative differential signal;
- a first shield positioned between the first monolithic inductor and a substrate, the first shield adapted to receive the phase-shifted output of the second buffer;
- and
- a second shield positioned between the second monolithic inductor and the substrate, the second shield adapted to receive the phase-shifted output of the first buffer.
4 more elements
A method of operating a differential circuit comprising:
- receiving a positive signal of a differential signal;
- receiving a negative signal of the differential signal;
- phase-shifting the positive differential signal by a first buffer;
- phase-shifting the negative differential signal by a second buffer;
- applying the positive and negative differential signals to at least one monolithic inductor;
- and
- applying the phase-shifted outputs of the first and second buffers to at least one shield underlying the at least one monolithic inductor.
4 more elements
Dependencies are inferred from the claim text.