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          華中科技大學學報(自然科學版) 2020, Vol. 48 Issue (9): 82-88 DOI10.13245/j.hust.200914

          欄目:電子與信息工程
          基于噪聲消除的低噪聲放大器架構
          姚若河 , 許澤韜
          華南理工大學電子與信息學院,廣東 廣州 510641
          摘要 提出了一種基于噪聲消除與襯底交叉耦合技術的寬帶低噪聲放大器(LNA)架構,在共柵(CG)與并聯反饋組合的噪聲消除結構基礎上,采用了襯底偏置和襯底交叉耦合技術使輸入級的等效跨導增大,提高了噪聲消除路徑中的消除率,降低了電路的噪聲指數.基于噪聲消除原理,通過在輸入級金屬氧化物晶體管(MOS)的襯底上采用無源增益增強的方式,增加了輸入級跨導的自由度,改善了原結構輸入匹配與噪聲指數之間相互制約的問題.根據LNA架構中節點的基爾霍夫電流公式,分析了新架構的增益、輸入匹配和噪聲指數.與現有噪聲消除結構相比,采用襯底交叉耦合技術使這個LNA架構的噪聲指數降低了13.3%.
          關鍵詞 低噪聲放大器 ;寬帶 ;噪聲消除 ;交叉耦合 ;增益增強
          Low noise amplifier architecture based on noise cancellation
          YAO Ruohe , XU Zetao
          School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510641,China
          Abstract A broadband low noise amplifier (LNA) architecture based on noise cancellation and substrate cross-coupling technique was presented.Based on the noise cancellation structure combined with common gate (CG) and shunt feedback,substrate bias and substrate cross-coupling technique was adopted in this LNA architecture to increase the equivalent transconductance of the input stage, the cancellation rate in the noise cancellation path was improved,and the noise figure of the circuit was reduced.Based on the noise cancellation principle,the passive gain-boosting method was adopted on the substrate of the input transistor to increase the input stage transconductance's degree of freedom,and the mutual restriction between the input matching and noise figure of the original structure was improved.Based on kirchhoff current formula of nodes in LNA architecture,the gain,input matching and noise figure of the new architecture were analyzed.Compared with the existing noise cancellation structure,the LNA architecture reduced the noise figure by 13.3% by using the substrate cross-coupling technique.
          Keywords low noise amplifier ; wideband ; noise cancellation ; cross-coupling ; gain-boosting
          基金資助廣東省科技計劃資助項目(2019B010143003)

          中圖分類號TN722.3
          文獻標志碼A
          文章編號1671-4512(2020)09-0082-06
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          文獻來源
          姚若河, 許澤韜. 基于噪聲消除的低噪聲放大器架構[J]. 華中科技大學學報(自然科學版), 2020, 48(9): 82-88
          DOI:10.13245/j.hust.200914
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