Compact multi-band filter/diplexer LNAs using split-type multi-resonant stages
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Date
2024-07-23
Authors
Cheng, Steven Matthew
Psychogiou, Dimitra
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Published Version
Abstract
This paper reports on the design and practical development of RF co-designed low-noise amplifiers (LNAs) with multi-band RF filter and diplexer capabilities. Split-type multi-resonant stages are used as complex-terminated matching networks to functionalize new classes of multi-band filtering LNAs (MBF-LNAs) and multi-band diplexer LNAs (MBD-LNAs). In this manner, the need for conventional matching networks or additional RF filtering is eliminated in the RF front-end, thus reducing its size. Miniaturization is further enhanced using split-type multi-resonant stages that are smaller than conventional transversal resonator arrays or filter-banks of in-line coupled resonators. The MBF-LNA and the MBD-LNA concepts are validated in S-band through the realization of two dual-band MBF-LNAs (MBF-LNA I and MBF-LNA II) and a quad-band MBD-LNA. Specifically, the MBF-LNA I exhibited a low noise figure (NF) of 0.65/0.9 dB and a gain of 19.1/16.5 dB for its passbands centered at 2.5/3.29 GHz. The MBFLNA II exhibited significantly higher isolation between the two passbands of 79.5 dB while having a NF of 1/1.5 dB and gain of 18.3/15.9 dB at 2.57/3.26 GHz. The MBD-LNA demonstrated two dual-band output channels with Channel 1 having a NF of 0.92/0.93 dB and gain of 17.2/15.2 dB at 2.38/3.29 GHz and Channel 2 having a NF of 0.82/1.02 dB and gain of 16.8/14.2 dB at 2.82/3.8 GHz.
Description
Keywords
Bandpass filter , Co-design , Diplexer , Filter amplifier , Low noise amplifier , Multi-band
Citation
Cheng, S. M. and Psychogiou, D. (2024) 'Compact multi-band filter/diplexer LNAs using split-type multi-resonant stages', IEEE Transactions on Circuits and Systems I: Regular Papers, 71(10), pp. 4512-4523. https://doi.org/10.1109/TCSI.2024.3430376