Design of K-band CMOS Frequency Divider Integrating a Marchand-type Transformer

摘要

In this paper, a design of K-band frequency divider integrating a Marchand-type transformer based on 0.18-u.m RF CMOS process is presented. The edge-coupled transformer is used to characterize and to provide differential signals for the CML frequency divider. The amplitude imbalance between S21 and S31 of the transformer is negligible below 35 GHz, and the phase imbalances are within 2° from 5 GHz to 33 GHz. Moreover, the insertion losses of the transformer are less than 6 dB from 21 GHz to 34 GHz. The 16 : 1 frequency divider formed by four 2 : 1 CML stages works correctly at entire K band with a total power consumption of 25 mW.