31-33 GHz CMOS PA For Ka-Band Radar System

A 31-33 GHz CMOS PA is designed and implemented using 90-nm CMOS technology for radar applications in this work. Based on the two stage differential class-AB power amplifier architecture, the PA is realized by using transformers as matching elements to save chip area. Moreover, neutralization technique is applied to ensure the stability. Consuming the power of 109.8 mW, the PA achieves the output power of 9.93 dBm and the PAE of 6.9 % at 32 GHz for the input power of -7 dBm.