Title :
A 77-GHz CMOS Power Amplifier With a Parallel Power Combiner Based on Transmission-Line Transformer
Author :
Juntaek Oh ; Bonhyun Ku ; Songcheol Hong
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea
Abstract :
This paper presents a 77-GHz CMOS power amplifier (PA) with a parallel power combiner based on a transmission-line transformer (TLT). An inter-stage matched cascode power cell structure is applied to obtain high output power and efficiency, where a simple matching network between the common-gate and common-source stage is introduced. The parallel power combiner based on a broadside-coupled TLT is analyzed and compared with a series power combiner. The PA is fabricated using a 65-nm RF CMOS process. It achieves the saturated output power of 15.8 dBm, the power-added efficiency of 15.2%, and the power gain of 20.9 dB with a supply voltage of 2.0 V at 77 GHz.
Keywords :
CMOS analogue integrated circuits; field effect MIMIC; high-frequency transformers; low noise amplifiers; millimetre wave power amplifiers; power combiners; CMOS power amplifier; RF CMOS process; broadside-coupled TLT; common-gate stage; common-source stage; efficiency 15.2 percent; frequency 77 GHz; interstage matched cascode power cell structure; parallel power combiner; power-added efficiency; series power combiner; simple matching network; size 65 nm; transmission-line transformer; voltage 2.0 V; 77 GHz; Automotive radar; CMOS; millimeter wave (mm-wave); power amplifiers (PAs); power combiners; transformers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2013.2261087
