High-Isolation Millimeter-Wave Subharmonic Monolithic Mixer With Modified Quasi-Circulator

This study presents a 21-40-GHz broadband subharmonic gate-pumped mixer using the standard 0.18-μ m CMOS process. A modified quasi-circulator is monolithically integrated with an nMOS field-effect transistor to perform down-converter mixing while enhancing all port isolations through a broadband ope...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2013-03, Vol.61 (3), p.1140-1149
Main Authors: HUNG, Shih-Han, LEE, Yi-Chang, SU, Chun-Chi, WANG, Yeong-Her
Format: Article
Language:English
Subjects:
Applied sciences
Bandwidth
Broadband
Circuit properties
CMOS
Conversion
Design. Technologies. Operation analysis. Testing
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Impedance matching
Insertion loss
Integrated circuits
isolation
Logic gates
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwaves
Mixers
Noise levels
Oscillations
Power dividers
quasi-circulator
Radio frequency
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Signal convertors
subharmonic mixer (SHM)
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Summary:This study presents a 21-40-GHz broadband subharmonic gate-pumped mixer using the standard 0.18-μ m CMOS process. A modified quasi-circulator is monolithically integrated with an nMOS field-effect transistor to perform down-converter mixing while enhancing all port isolations through a broadband operation. The proposed configuration has a chip size of less than 0.9 mm 2 . The measured results demonstrate a low conversion loss from 8.3 to 14.2 dB, a local oscillation (LO)-to-RF isolation greater than 50 dB, and a high 2LO-to-RF isolation of 48 dB to 65 dB over the 21-40-GHz RF bandwidth at a 10.5-dBm LO power level.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2013.2244229