Keywords : square transformer
Engineering and Technology Journal,
2010, Volume 28, Issue 4, Pages 676-685
In this work, a proposed on-chip radio-frequency (RF) transformer design and
layout technique is presented to achieve high magnetic coupling coefficient and
low insertion loss by segmenting and interleaving wide primary and secondary
metal traces. Additional advantage of such technique is the mitigation of proximity
effect and current crowding. The proposed technique is verified and tested for a
square transformer, with different segmentation structures, using EMSight
simulator of Microwave Office 2007 (version 7.5) RF/Microwave software tools.
By using this design and layout technique, the magnetic coupling coefficient
improves from 0.49 to over 0.72 and lowers the minimum insertion loss from
1.56 dB to 1.18 dB at 4.5 GHz center frequency.