研究目的
To design a low noise amplifier (LNA) with sub-1dB noise figure at X-Band for phased array applications, achieving improved noise performance compared to existing SiGe-based LNAs.
研究成果
The presented LNA achieves a record low noise figure of 0.77 dB in X-Band using SiGe technology, with adequate gain and linearity. It demonstrates the effectiveness of the CE topology without a series base inductor for noise reduction. Future work could involve cascading with additional stages for higher gain while maintaining low noise.
研究不足
The design has limited gain (~10 dB) compared to cascode topologies, and input matching deviations occur due to parasitic capacitances from decoupling capacitors. The approach may not be directly applicable to other frequency bands or technologies without adjustments.
1：Experimental Design and Method Selection:
The LNA is designed using a common-emitter (CE) topology without a series base inductor to reduce parasitic base resistance and noise. Impedance matching is achieved by considering the base-collector impedance and using an LC-type matching network at the output. Theoretical models include noise figure equations and small-signal analysis.
2：Sample Selection and Data Sources:
The design is fabricated using IHP Microelectronics' 0.13μm SiGe BiCMOS technology with HBTs having fT of 250 GHz and fMAX of 330 GHz.
3：13μm SiGe BiCMOS technology with HBTs having fT of 250 GHz and fMAX of 330 GHz.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes Keysight N5224A PNA Network Analyzer for S-parameters, ATN NP5 microwave noise parameter system for noise measurements, and Keysight E8267D PSG Vector Signal Generator for compression point measurements. Materials include on-chip inductors and capacitors designed using SONNET software.
4：Experimental Procedures and Operational Workflow:
The LNA is fabricated and measured for S-parameters, noise figure, and linearity. Noise measurements involve multiple impedance terminations to extract noise parameters. Simulations are performed to validate the design.
5：Data Analysis Methods:
Data is analyzed using noise parameter extraction methods and compared with simulations. Performance is evaluated using a Figure-of-Merit (FoM) that considers gain, noise figure, power dissipation, and linearity.
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