Size reduction of a MMIC direct up-converter at 44 Ghz in multilayer CPW technology using thin-film microstrip stubs loading
In: IEEE transactions on microwave theory and techniques, Jg. 54 (2006), Heft 9, S. 3453-3461
Online
academicJournal
- print, 27 ref
Zugriff:
This paper proposes a novel compact multilayer 44.5-GHz coplanar waveguide (CPW) single-sideband (SSB) subharmonically pumped (SHP) mixer for direct up-conversion GaAs monolithic microwave integrated circuit. It uses previously developed thin-film microstrip (TFMS) and CPW structures for capacitive and inductive loading techniques to drastically reduce its size. The SSB SHP mixer uses 50-MHz in-phase and quadrature signals to directly modulate the second harmonic of a 22.25-GHz carrier to produce the required 44.55-GHz RF output. Two pairs of antiparallel diodes reduce feedthrough of the fundamental 22.25-GHz signal to the RF output while novel CPW/TFMS-based structures provide matching. This 1.2 × 1.5mm2 chip uses a lumped Wilkinson divider as a local-oscillator divider and a previously developed reduced size 90° coupler. The SSB SHP mixer acts as an up-converter with a measured conversion gain of -10±1 dB and the lower sideband suppression is greater than 23 dB across the RF bandwidth of 43.5-45.5 GHz. Additionally, it is shown that the RF port return loss is better than 20 dB, and 2 x fLO was suppressed by 21 dB over the same band. The circuit also does not require any dc bias. Compared to the conventional SSB SHP mixer, a 70% reduction in circuit area was achieved with better performances.
Titel: |
Size reduction of a MMIC direct up-converter at 44 Ghz in multilayer CPW technology using thin-film microstrip stubs loading
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Autor/in / Beteiligte Person: | HETTAK, Khelifa ; MORIN, Gilbert A ; STUBBS, Malcolm G |
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Zeitschrift: | IEEE transactions on microwave theory and techniques, Jg. 54 (2006), Heft 9, S. 3453-3461 |
Veröffentlichung: | New York, NY: Institute of Electrical and Electronics Engineers, 2006 |
Medientyp: | academicJournal |
Umfang: | print, 27 ref |
ISSN: | 0018-9480 (print) |
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