Reduction of Inductive Crosstalk Using Quadrupole Inductors

Interference due to inductor crosstalk is a growing concern in modern RFICs where inductors are placed in close proximity. A quadrupole inductor is explored as a method to reduce inductive crosstalk. A quadrupole inductor and standard inductor are compared with respect to inductance, quality factor, and area. Then, physics-based calculations are corroborated with simulation and measurement to predict crosstalk reduction as a function of position. Measurements verify up to a 31 dB reduction in crosstalk. Finally, phase noise measurements of voltage-controlled oscillators show that the quadrupole inductor can be used in circuits without negatively impacting performance.