Title :
A 30-GHz Integrated Subharmonic Mixer Based on a Multichannel Graphene FET
Author :
Habibpour, Omid ; Vukusic, Josip ; Stake, Jan
Author_Institution :
Dept. of Microtechnol. & Nanosci., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
A 30-GHz integrated subharmonic mixer based on a single graphene field-effect transistor (G-FET) has been designed, fabricated, and characterized. The mixer is realized in microstrip technology on a 250- μm-high-resistivity silicon substrate. In order to enhance the current on-off ratio, the G-FET utilizes a channel consisting of an array of bow-tie structured graphene, yielding a current on-off ratio of 7. A conversion loss (CL) of 19 ± 1 dB over the frequency range of 24-31 GHz is obtained with a local oscillator (LO) to RF isolation better than 20 dB at an LO power of 10 dBm. The overall minimum CL is 18 dB at 27 GHz. The mixer has a 3 GHz ± 1-dB IF bandwidth, which is achieved with a fixed LO signal of 15 GHz. The mixer linearity is characterized and the highest third-order intercept point is measured to be 12.8 dBm.
Keywords :
field effect transistors; graphene; mixers (circuits); RF isolation; bow-tie structured graphene; conversion loss; current on-off ratio; frequency 30 GHz; frequency range; high-resistivity silicon substrate; integrated subharmonic mixer; microstrip technology; multichannel graphene FET; FETs; Frequency measurement; Logic gates; Mixers; Radio frequency; Silicon; Graphene; harmonic-balance analysis; microwave field-effect transistors (FETs); millimeter-wave mixers; monolithic microwave integrated circuit (MMIC); subharmonic resistive mixers;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2012.2236434
