CMOS 1:1 Transformer design for millimeter wave application

The key design aspects of CMOS transformer for millimeter wave applications are demonstrated in this paper. Two types of 1:1 CMOS transformers by broadside and edge coupling are simulated and compared based upon 65nm CMOS technology. The performance of transformers with various dimensions is discussed in millimeter-wave range. In particular, the S-parameter, impedance, quality factor etc. are illustrated from the view of practical usages. This paper provides a general guidance for on-chip transformer design in CMOS process.