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A High-Power Broadband Passive Terahertz Frequency Doubler in CMOS

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2 Author(s)
Han, R. ; Dept. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA ; Afshari, E.

To realize a high-efficiency terahertz signal source, a varactor-based frequency-doubler topology is proposed. The structure is based on a compact partially coupled ring that simultaneously achieves isolation, matching, and harmonic filtering for both input and output signals at f0 and 2f0. The optimum varactor pumping/loading conditions for the highest conversion efficiency are also presented analytically along with intuitive circuit representations. Using the proposed circuit, a passive 480-GHz frequency doubler with a measured minimum conversion loss of 14.3 dB and an unsaturated output power of 0.23 mW is reported. Within 20-GHz range, the fluctuation of the measured output power is less than 1.5 dB, and the simulated 3-dB output bandwidth is 70 GHz (14.6%). The doubler is fabricated using 65-nm low-power bulk CMOS technology and consumes near zero dc power.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:61 ,  Issue: 3 )