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An Interstage-Reflectionless V -Band Radiometer With Capacitor-Reused Absorptive Matching in 0.13- μ m SiGe BiCMOS.
- Source :
-
IEEE Transactions on Circuits & Systems. Part I: Regular Papers . Nov2021, Vol. 68 Issue 11, p4589-4602. 14p. - Publication Year :
- 2021
-
Abstract
- A ${V}$ -band heterodyne radiometer in SiGe BiCMOS employing a capacitor-reused absorptive inter-stage matching network is firstly proposed, which prevents from employing a circulator, a resistive attenuator or two quadrature couplers in the conventional high-sensitivity cascaded receiver. This radiometer consists of a five-stage low noise amplifier (LNA) with the proposed reflectionless output matching network (RLMN), and a double-balanced Gilbert mixer stage with integrated Marchand baluns. In the RLMN, the capacitor for in-band matching is reused as an impedance inverter in the lossy absorptive network to eliminate reflections. Utilizing the reflectionless LNA, the radiometer eliminates the out-of-band reflected signals round the interfaces of LNA and mixer. Fabricated in a $0.13~\mu \text{m}$ SiGe BiCMOS technology, the reflectionless LNA achieves a gain of 31.9 dB@56 GHz, an absolutely stable operation in-band and 11 times larger stability factor out-of-band than conventional LNAs. Moreover, the implemented heterodyne radiometer achieves a noise equivalent temperature difference (NETD) of 0.3 K which is even comparable with wideband direct-detection radiometers. [ABSTRACT FROM AUTHOR]
- Subjects :
- *LOW noise amplifiers
*MICROWAVE radiometers
*RADIOMETERS
Subjects
Details
- Language :
- English
- ISSN :
- 15498328
- Volume :
- 68
- Issue :
- 11
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Circuits & Systems. Part I: Regular Papers
- Publication Type :
- Periodical
- Accession number :
- 153763188
- Full Text :
- https://doi.org/10.1109/TCSI.2021.3107290