NDLI: A novel size reduction of a MMIC I/Q direct down converter in uniplanar technology at 20 GHz using CPW and ACPS stubs loading for an EHF satcom terminal phased array size

Content Provider	IEEE Xplore Digital Library
Author	Hettak, K. Verver, C.J. Morin, G.A. Stubbs, M.G.
Copyright Year	2009
Description	Author affiliation: Communications Research Centre Canada, 3701 Carling Ave., P.O. Box 11490, Station ¿H¿, Ottawa, Ontario, Canada, K2H 8S2 (Hettak, K.; Verver, C.J.; Stubbs, M.G.) \|\| Defence R&D Canada - Ottawa, Ontario, Canada, K1A 0Z4 (Morin, G.A.)
Abstract	This paper proposes a novel compact uniplanar 20 GHz/baseband I/Q direct downconverter GaAs MMIC. It uses previously developed ACPS and CPW structures for capacitive and inductive loading techniques to drastically reduce its size. The proposed I/Q down converter uses direct analog extraction of the baseband in-phase and quadrature (I and Q) signals from the 20 GHz RF signal. Two pairs of antiparallel diodes achieve frequency translation by mixing the RF signal with the fundamental local oscillator (LO) pump while novel ACPS reduced size magic T, provide high local oscillator (LO)-to-RF isolation and good spurious suppression. The circuit was fabricated using OMMIC's ED02AH foundry process and contains two pairs of 0.18 µm PHEMT based diodes, each having two 15-µm cathode fingers. This 3.15 × 4.1 $mm^{2}$ chip uses a previously developed, reduced size Wilkinson divider as an RF divider and a previously developed, reduced size 90° coupler. The I/Q down converter conversion gain was measured to be - 15.5dB ±1dB over the RF frequency range of 20.2 to 21.2 GHz with the IF fixed at 1 MHz. The amplitude imbalance between the I&Q channels was under 0.8dB and the quadrature phase error was less than 4°over the frequency range. The circuit also does not require any dc bias. Compared to the conventional microstrip I/Q direct down converter a 40% reduction in circuit area was achieved with better performance.
Starting Page	304
Ending Page	307
File Size	190858
Page Count	4
File Format	PDF
ISBN	9781424447497
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-09-28
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	EuMA
Subject Keyword	Phased arrays Radio frequency Local oscillators Baseband Circuits Gallium arsenide MMICs Coplanar waveguides Microwave antenna arrays Diodes
Content Type	Text
Resource Type	Article

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