Inductor layout, and a voltage-controlled oscillator (VCO) system

1. An inductor layout comprising:

a first inductor; and

a second inductor;

wherein the first and second inductors comprise electrically and magnetically independent inductors;

wherein the first and second inductors are concentrically arranged on an integrated circuit; and

wherein at least one of the first and second inductors comprises a first multi-loop inductor with a first axis of symmetry.

2. The inductor layout of claim 1 , wherein the first inductor and the second inductor comprise electrically and magnetically independent inductors having an electro-magnetic coupling coefficient k less than 0.1.

3. The inductor layout of claim 1 , wherein the multi-loop inductor comprises an even number of inductor loops arranged in a plane of the multi-loop inductor such that magnetic fields emanating from the inductor loops substantially cancel each other.

4. The inductor layout of claim 3 , wherein the other one of the at least one of the first and second inductors comprises a second multi-loop inductor having a second axis of symmetry, and wherein the first and second inductors are rotated relative to each other such that they have an electro-magnetic coupling coefficient k that is substantially minimized.

5. The inductor layout of claim 4 , wherein:

each of the first and second inductors comprises two inductor loops;

each of the first and second inductors is substantially figure 8-shaped; and

the first and second inductors are rotated relative to each other such that an angle between the first axis of symmetry of the first inductor and the second axis of symmetry of the second inductor is about 90 degrees.

6. The inductor layout of claim 4 , wherein:

each of the first and second inductors comprises four inductor loops;

each of the first and second inductors is substantially four-leaf clover-shaped; and

the first and second inductors are rotated relative to each other such that an angle between the first axis of symmetry of the first inductor and the second axis of symmetry of the second inductor is about 45 degrees.

7. The inductor layout of claim 1 , further comprising at least a third inductor concentrically arranged with the first and second inductors on the integrated circuit, said third inductor comprising an independent inductor.

8. The inductor layout of claim 7 , wherein at least one of the first inductor, the second inductor, and the at least third inductor comprises a multi-turn inductor comprising at least one multi-turn inductor loop.

9. The inductor layout of claim 1 , wherein only one of the inductors is configured to be activated at each point in time.

10. The inductor layout of claim 1 , wherein the first and second inductors are not the same size.

11. A Voltage-Controlled Oscillator (VCO) system for frequency generation in an integrated circuit, the VCO system comprising:

an inductor layout comprising:

first inductor; and

a second inductor;

wherein the first and second inductors comprise electrically and magnetically independent inductors;

wherein the first and second inductors are concentrically arranged on an integrated circuit; and

wherein at least one of the first and second inductors comprises a multi-loop inductor with a first axis of symmetry.

12. The VCO system of claim 11 , wherein the first inductor and the second inductor comprise electrically and magnetically independent inductors having an electro-magnetic coupling coefficient k less than 0.1.

13. The VCO system of claim 11 , wherein the multi-loop inductor comprises an even number of inductor loops arranged in a plane of the multi-loop inductor such that magnetic fields emanating from the inductor loops substantially cancel each other.

14. The VCO system of claim 11 , further comprising at least a third inductor concentrically arranged with the first and second inductors on the integrated circuit, said third inductor comprising an independent inductor.

15. The VCO system of claim 11 , wherein:

a first VCO comprises the first inductor;

a second VCO comprises the second inductor; and

a size of one of the first and second inductors is smaller than a size of the other one of the first and second inductors, whereby the oscillation frequency of the VCO comprising the smaller inductor is higher than the oscillation frequency of the VCO comprising the larger inductor.

16. The VCO system of claim 15 , wherein the first and second VCOs comprise respective capacitor banks, and wherein the first and second VCOs are configured to share bias and control blocks.

17. An integrated RF transceiver circuit comprising:

a Voltage-Controlled Oscillator (VCO) system for frequency generation in an integrated circuit, the VCO system comprising:

an inductor layout comprising

first inductor; and

a second inductor;

wherein the first and second inductors comprise electrically and magnetically independent inductors;

wherein the first and second inductors are concentrically arranged on an integrated circuit; and

wherein at least one of the first and second inductors comprises a multi-loop inductor with a first axis of symmetry.

18. An integrated circuit comprising

a Voltage-Controlled Oscillator (VCO) system for frequency generation in an integrated circuit, the VCO system comprising:

an inductor layout comprising

first inductor; and

a second inductor; and

control logic operatively coupled to the VCO system and configured to implement frequency tuning in the integrated circuit;

wherein the first and second inductors comprise electrically and magnetically independent inductors;

wherein the first and second inductors are concentrically arranged on an integrated circuit; and

wherein at least one of the first and second inductors comprises a multi-loop inductor with a first axis of symmetry.