Abstract
In this paper, we present the development of submillimeter-wave monolithic
integrated circuits (S-MMICs) and modules for use in next-generation
sensors and high-data-rate wireless communication systems, operating
in the 300-500-GHz frequency regime. A four-stage 460-GHz amplifier
MMIC and a 440-GHz class-B frequency doubler circuit have been successfully
realized using our 35-nm InAlAs/InGaAs-based metamorphic high-electron
mobility transistor (mHEMT) technology in combination with grounded
coplanar circuit topology (GCPW). Additionally, a 500-GHz amplifier
MMIC was fabricated using a more advanced 20-nm mHEMT technology.
To package the submillimeter-wave circuits, a set of waveguide-to-microstrip
transitions has been fabricated on both 50- \#x03BC;m-thick quartz
and GaAs substrates, covering the frequency range between 220 and
500 GHz. The E-plane probes were integrated in a four-stage 20-nm
cascode amplifier circuit to realize a full H -band (220 to 325 GHz)
S-MMIC amplifier module with monolithically integrated waveguide
transitions.
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