A Passive Tunable Matching Filter for Multiband RF Applications Demonstrated at 7 to 14 GHz

This letter presents a general approach to implement a wideband tunable matching filter for multiband radio-frequency applications. The concept is demonstrated for a two-stage bipolar amplifier to achieve a tunable input and output small-signal match to 50 Ω. The filters are realized as π-networks w...

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Bibliographic Details
Published inIEEE microwave and wireless components letters Vol. 27; no. 8; pp. 703 - 705
Main Authors Starke, Paul, Fritsche, David, Carta, Corrado, Ellinger, Frank
Format Journal Article
LanguageEnglish
Published IEEE 01.08.2017
Subjects
Amplifier
Bandwidth
BiCMOS
Capacitors
digital tunable capacitor (DTC)
Impedance matching
inductor
Inductors
multiband
Q-factor
Radio frequency
radio frequency (RF)
SiGe
tunable filter
tunable matching
Tuning
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Summary:This letter presents a general approach to implement a wideband tunable matching filter for multiband radio-frequency applications. The concept is demonstrated for a two-stage bipolar amplifier to achieve a tunable input and output small-signal match to 50 Ω. The filters are realized as π-networks with two fixed inductors and a 4-bit digitally tuned capacitor based on CMOS switches. The utilized technology is a 130-nm SiGe BiCMOS process. A total frequency tuning range of 7-14 GHz with at least 8-dB return loss and 16.5-20 dB gain is confirmed by measurements and aligns well with the theoretical predictions and simulation results. In addition, a compact analytic theory for the proposed network is derived to extend this approach to arbitrary frequencies and bandwidths.
ISSN:1531-1309
1558-1764
DOI:10.1109/LMWC.2017.2724006