Heterodyne receivers operating at THz frequencies can detect rotation spectra of several spurious gases. These receivers typically use sub harmonic Schottky diode mixers, which need a low phase noise local oscillator (LO) input generated by frequency multiplication and amplification. THz radiometry requires broadband receivers with low noise temperatures which are necessary for high temperature resolutions. All these systems benefit from low-noise transistors working at millimeter-wave (MMW) frequencies. Metamorphic HEMT technology has been demonstrated to be highly suitable for the development of advanced millimeter-wave and sub-millimeter wave circuits for space applications. Sub-millimeter and millimeter wave amplifier circuits have been demonstrated with mHEMT devices of 35 nm and 50 nm gate length. Devices with 100 nm gate length were used for a mixer, a sixtupler and a PLL based VCO design operating at W-, D-, and G-band. The possible monolithic integration of special Schottky diode detectors with this technology was also presented.
Advanced mHEMT technologies for space applications
Verbesserte mHEMT-Technologien für die Raumtechnik
2009
5 Seiten, 16 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
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