- 學位論文
Ku-band及K-band低雜訊放大器之設計
Design of the Ku-band and K-band Low Noise Amplifiers
摘要
本論文主要研究Ku-Band以及K-Band之低雜訊放大器(Low Noise Amplifier, LNA)電路，電路採用穩懋半導體公司(WIN Semiconductors Corp)所提供的0.15μm pHEMT製程進行設計。為了得到高增益以及低雜訊，電路設計嘗試使用了疊接式架構、串接式架構、源極退化式電感架構以及迴授式架構，並對其模擬與量測結果進行分析與比較。Ku-Band以及K-Band之低雜訊放大器都皆可以運用於衛星之中。 第一部份為Ku-Band低雜訊放大器，頻段為12GHz-18GHz，採用疊接式架構以及串接式架構，疊接式架構主要可以改善米勒效應，消除多餘的雜散電容，而串接式架構可以提供高增益與擁有較佳的隔離度。此低雜訊放大器所量測到的數值如下，增益為11.3~22.6dB，雜訊指數為5.4~7.9dB，輸入的反射係數為-7.4~-22dB，輸出的反射係數為-7.6~-12.8dB，而反向隔離度為-44.1~-34.3dB。 第二部份為K-Band低雜訊放大器，頻段為18GHz-26GHz，主要電路架構使用源極退化式電感、串接式架構以及迴授式架構，源極退化式電感是透過調整電感的大小來進行輸入端的匹配，再以串接式架構來提高增益，電路也使用迴授式架構使增益平坦化以及增加電路的穩定性。此低雜訊放大器所量測的增益為9~15dB，雜訊指數為6.8~8.3dB，輸入反射係數為-6.7~-11.3dB，輸出反射係數為-5.1~-11dB，而反向隔離度為-19.6 ~ -30 dB。
並列摘要
In this thesis, the search mainly focused on the design of the Ku-band and K-band Low Noise Amplifiers(LNA). The circuit design using the 0.15 pHEMT process provided by WIN Semiconductors. In order to achieve high gain and low noise figure, the circuit design adopted cascode architecture、cascade architecture、inductive source degeneration and resistance feedback, and the measured result compared with the simulation result. The Ku-band and K-band LNA can apply to the satellites. At the first, the Ku-band LNA bandwidth is 12GHz-18GHz, using cascade architecture and cascade architecture. The cascode architecture can improve the Miller effect and eliminate parasitic capacitance. The cascade architecture can provide for the gain and isolation. The measurement has showed the results of gain 11.3~22.6dB, noise figure 5.4~7.9dB, input return loss -7.4~-22dB, output return -7.6~-12.8dB, and isolation -44.1~-34.3dB. In the second, the K-band LNA bandwidth is 18GHz-26GHz. The main circuit architecture adopted inductive source degeneration, cascade architecture and resistance feedback. The inductive source degeneration adjusts the inductance to input impedance matching. The cascade can provide gain and the circuit adopted resistance feedback can provide flat gain and better stability. The measurement has showed the result of gain 9~15dB, noise figure 6.8~8.3dB, input return loss -6.7~-11.3dB, output return-5.1~-11dB, and isolation -19.6 ~ -30dB.