| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 89 === This thesis analyzes the characteristics of on-chip interleaved spiral transformers with different numbers of turns and inner diameters for each spiral inductor. These transformers have been fabricated using a CMOS technology with six metal layers. The results show that the transformer with highest trace length can have highest magnetic coupling coefficient approaching 0.8, maximum quality factor about 5.7. The safe resonance frequency, 6.7GHz, which makes the application of integrated interleaved transformers in RFICs possible. Moreover, the temperature-effect have been included to characterize the behavior of spiral transformers over the temperature range from —40℃ to 150℃.
To facilitate their applications in the RFIC design, a simple but acceptable interleaved transformer model is presented. The simulation results show the good fit to the measured results below 3GHz, although the proximity effect and the loss due to eddy current induced in the substrate are not considered. The model is then exploited in a mixer circuit, and the simulation result proves the application of this model for RFIC designs.
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