On-chip transformer balun
First Claim
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1. An on-chip transformer balun comprises:
- primary winding having at least one primary turn, a first port and a second port operably coupled for a single-ended signal, wherein the at least one primary turn is substantially symmetrical with respect to the first and second ports, and wherein the primary winding is on at least one dielectric layer; and
secondary winding having at least one secondary turn, a third port, a center tap, and a fourth port operably coupled for a differential signal, wherein the differential signal corresponds to the single-ended signal, wherein the at least one secondary turn is substantially symmetrical about the center tap with respect to the third and fourth ports, and wherein the secondary winding is on at least one other dielectric layer and is magnetically coupled to the primary winding.
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Abstract
A transformer balun is obtained that is symmetrical in structure, provides high current, or high voltage, amplification and has high coupling coefficients while maintaining minimal overall size. The balun structure includes primary and secondary metal windings at separate layer interfaces. The primary and secondary metal windings are symmetrical and can have any number of turns, which is only limited by integrated circuit area and capacitance. Accordingly, the, primary and secondary windings may be on as many layers as needed. Further, the primary and/or secondary may include a center tap ground, which enables the winding to be used as a differential port.
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Citations
8 Claims
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1. An on-chip transformer balun comprises:
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primary winding having at least one primary turn, a first port and a second port operably coupled for a single-ended signal, wherein the at least one primary turn is substantially symmetrical with respect to the first and second ports, and wherein the primary winding is on at least one dielectric layer; and
secondary winding having at least one secondary turn, a third port, a center tap, and a fourth port operably coupled for a differential signal, wherein the differential signal corresponds to the single-ended signal, wherein the at least one secondary turn is substantially symmetrical about the center tap with respect to the third and fourth ports, and wherein the secondary winding is on at least one other dielectric layer and is magnetically coupled to the primary winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification