Method of and inductor layout for reduced VCO coupling
DCFirst Claim
1. An inductor layout having reduced mutual electromagnetic coupling, comprising:
- a first inductor having a reduced far field, said first inductor comprising;
a first loop having a shape that is substantially symmetrical about a first predefined axis;
a second loop connected to the first loop, said second loop having a size and shape substantially identical to the first ioop, said second loop arranged such that a magnetic field emanating therefrom tends to cancel a magnetic field emanating from the first loop; and
two closely spaced terminals connected to the first loop for supplying electrical current to the first and second loops while minimizing magnetic field contributions from the terminals; and
a second inductor positioned at a predetermined distance from the first inductor, wherein a mutual electromagnetic coupling between the first inductor and the second inductor is reduced as a result of the first inductor having a reduced electromagnetic field.
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Accused Products
Abstract
Method and system are disclosed for reducing mutual EM coupling between VCO resonators and for implementing the same on a single semiconductor chip. The method and system involve using inductors that are substantially symmetrical about their horizontal and/or their vertical axes and providing current to the inductors in a way so that the resulting magnetic field components tend to cancel each other by virtue of the symmetry. In addition, two such inductors may be placed near each other and oriented in a way so that the induced current in the second inductor due to the magnetic field originating from first inductor is significantly reduced. The inductors may be 8-shaped, four-leaf clover-shaped, single-turn, multi-turn, rotated relative to one another, and/or vertically offset relative to one another. This Abstract is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
68 Citations
21 Claims
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1. An inductor layout having reduced mutual electromagnetic coupling, comprising:
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a first inductor having a reduced far field, said first inductor comprising; a first loop having a shape that is substantially symmetrical about a first predefined axis; a second loop connected to the first loop, said second loop having a size and shape substantially identical to the first ioop, said second loop arranged such that a magnetic field emanating therefrom tends to cancel a magnetic field emanating from the first loop; and two closely spaced terminals connected to the first loop for supplying electrical current to the first and second loops while minimizing magnetic field contributions from the terminals; and a second inductor positioned at a predetermined distance from the first inductor, wherein a mutual electromagnetic coupling between the first inductor and the second inductor is reduced as a result of the first inductor having a reduced electromagnetic field. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of reducing mutual electromagnetic coupling between a first inductor and a second inductor on a semiconductor die, comprising:
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forming the first inductor to reduce a far field, said step of forming the first inductor comprising; forming a first loop having a shape that is substantially symmetrical about a first predefined axis; forming a second loop having a size and shape substantially identical to the first loop; orienting the second loop in relation to the first loop such that a magnetic field emanating from the second loop tends to cancel a magnetic field emanating from the first loop; and connecting two closely spaced terminals to the first loop for supplying electrical current to the first and second loops while minimizing magnetic field contributions from the terminals; and positioning a second inductor at a predetermined distance from the first inductor, wherein the mutual electromagnetic coupling between the first inductor and the second inductor is reduced as a result of the first inductor having a reduced electromagnetic field. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An inductor having a reduced far field, comprising:
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a first loop having a shape that is substantially symmetrical about a first predefined axis; a second loop having a size and shape substantially identical to the first loop, said second loop arranged such that a magnetic field emanating therefrom tends to cancel a magnetic field emanating from said first loop; and two closely spaced terminals connected to the first loop for supplying electrical current to the first and second loops while minimizing magnetic field contributions from the terminals. - View Dependent Claims (21)
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Specification