A Truly Balanced Q-Band CMOS Frequency Doubler Based on Hybrid Quadrature Coupler

作者：Wan, Jiayue; Chen, Zhiming^*; An, Qiang; Wang, Xinghua

来源：IEEE Microwave and Wireless Components Letters, 2017, 27(2): 165-167.

DOI：10.1109/LMWC.2016.2646909

• CMOS
• frequency doubler
• Gilbert cell
• hybrid quadrature coupler
• Q-band

In this letter, a truly balanced CMOS Q-band frequency doubler with an ultra-compact differential hybrid quadrature coupler is demonstrated using 90-nm CMOS technology. The doubler incorporates two Gilbert-cells fed by I/Q signals to compensate the time delay from transconductance stage and avoid output DC offset, providing truly balanced differential outputs. The doubler achieves a 3-dB bandwidth from 40 to 49 GHz with a minimum conversion loss of 1.6 dB at 44 GHz, while the output amplitude imbalance is measured to be less than 0.7dB. The measured I/Q mismatch of the quadrature coupler is less than 1 degrees within 10 GHz bandwidth. The doubler chip consumes 9.6 mA from a 1.2-V supply, and the chip dimension is 0.7 x 0.9 mm(2).

• 出版日期2017-2
• 单位北京理工大学