Integrated On-Chip Transformers: Recent Progress in the Design, Layout, Modeling and Fabrication.

Area of Science:

• Electrical Engineering
• Radio Frequency (RF) Engineering
• Integrated Circuit Design

Background:

• On-chip transformers are crucial for Radio Frequency (RF) wireless applications.
• Their performance directly impacts device functionality and efficiency.
• Existing literature offers fragmented insights into their design and optimization.

Purpose of the Study:

• To provide a comprehensive review of on-chip transformer technology.
• To analyze various equivalent circuit models, design strategies, and fabrication techniques.
• To discuss performance parameters, enhancement methods, and applications.

Main Methods:

• Review of equivalent circuit models for transformer behavior.
• Comparative study of design and layout strategies.
• Analysis of fabrication techniques and performance enhancement methods (e.g., MEMS).

Main Results:

• Characterization of critical performance parameters: Q-factor, coupling factor (k), and resonance frequency (f_SR).
• Comparison of performance metrics against silicon chip area requirements.
• Summary of different on-chip transformer types and their trade-offs.

Conclusions:

• On-chip transformers are vital components with evolving design and fabrication techniques.
• Performance optimization involves trade-offs with chip area and integration methods.
• Future work should focus on advanced integration and enhancement strategies.