Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach
This paper proposes relaxed Simultaneous Signal and Noise Matching (SSNM) conditions to address limitations in selecting source degeneration inductors for multistage LNA design, achieved by introducing controlled mismatches at the external ports. Additionally, a novel frequency-bounded mismatch enve...
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| Format: | Article |
| Language: | English |
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MDPI AG
2025-07-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/15/15/8148 |
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| author | Vanya Sharma Patrick E. Longhi Walter Ciccognani Sergio Colangeli Antonio Serino Swati Sharma Ernesto Limiti |
| author_facet | Vanya Sharma Patrick E. Longhi Walter Ciccognani Sergio Colangeli Antonio Serino Swati Sharma Ernesto Limiti |
| author_sort | Vanya Sharma |
| collection | DOAJ |
| description | This paper proposes relaxed Simultaneous Signal and Noise Matching (SSNM) conditions to address limitations in selecting source degeneration inductors for multistage LNA design, achieved by introducing controlled mismatches at the external ports. Additionally, a novel frequency-bounded mismatch envelope is introduced to guide load termination selection based on desired IM-OM (input mismatch-output mismatch) characteristics across the operating band. Building on these concepts, a systematic, easy-to-follow strategy is presented for implementing wideband multistage low-noise amplifiers (LNAs), significantly reducing reliance on blind CAD-based optimisation. This approach is validated through a three-stage MMIC LNA prototype, fabricated using a 0.15 μm GaAs process and operating from 28 to 34 GHz. The measured results closely match the simulation, demonstrating a stable gain of 23 ± 1 dB and a noise figure of 2–2.5 dB, confirming the practical effectiveness of the proposed design approach for wideband amplifiers. |
| format | Article |
| id | doaj-art-c8c4749d61c248d8977651cd0ccb3a80 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-c8c4749d61c248d8977651cd0ccb3a802025-08-20T03:36:02ZengMDPI AGApplied Sciences2076-34172025-07-011515814810.3390/app15158148Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM ApproachVanya Sharma0Patrick E. Longhi1Walter Ciccognani2Sergio Colangeli3Antonio Serino4Swati Sharma5Ernesto Limiti6Department of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyDepartment of Electronics Engineering, University of Rome Tor Vergata, 00133 Rome, ItalyThis paper proposes relaxed Simultaneous Signal and Noise Matching (SSNM) conditions to address limitations in selecting source degeneration inductors for multistage LNA design, achieved by introducing controlled mismatches at the external ports. Additionally, a novel frequency-bounded mismatch envelope is introduced to guide load termination selection based on desired IM-OM (input mismatch-output mismatch) characteristics across the operating band. Building on these concepts, a systematic, easy-to-follow strategy is presented for implementing wideband multistage low-noise amplifiers (LNAs), significantly reducing reliance on blind CAD-based optimisation. This approach is validated through a three-stage MMIC LNA prototype, fabricated using a 0.15 μm GaAs process and operating from 28 to 34 GHz. The measured results closely match the simulation, demonstrating a stable gain of 23 ± 1 dB and a noise figure of 2–2.5 dB, confirming the practical effectiveness of the proposed design approach for wideband amplifiers.https://www.mdpi.com/2076-3417/15/15/8148IM-OM circleswide-band impedance matchingmismatch regionsMMICLNAGaAS pHEMTs |
| spellingShingle | Vanya Sharma Patrick E. Longhi Walter Ciccognani Sergio Colangeli Antonio Serino Swati Sharma Ernesto Limiti Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach Applied Sciences IM-OM circles wide-band impedance matching mismatch regions MMIC LNA GaAS pHEMTs |
| title | Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach |
| title_full | Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach |
| title_fullStr | Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach |
| title_full_unstemmed | Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach |
| title_short | Frequency-Bounded Matching Strategy for Wideband LNA Design Utilising a Relaxed SSNM Approach |
| title_sort | frequency bounded matching strategy for wideband lna design utilising a relaxed ssnm approach |
| topic | IM-OM circles wide-band impedance matching mismatch regions MMIC LNA GaAS pHEMTs |
| url | https://www.mdpi.com/2076-3417/15/15/8148 |
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