Noise Canceling in Wideband Low Noise Amplifiers LNA

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Noise Canceling in Wideband Low Noise Amplifiers
(LNA)

• ???
• ??? ????????? 304204829
• ???? ???????? 043353424

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???? ?????????

• Wideband LNAs ??? ?????? ???? ???? ??? ????
  ???? ???? ??????? ?????? ??? ?? ?????????,
  ??????? ??????? ??????? ??? ?????? ?? ????? ??
  ?????, ???? ?????? ????????? ??????, ??????
  ?????? ?????? ??????? ?????? "????" (Multi-Band)
  ?????? ?????.
• ????????? ????? ?????? ????? (??????), ??????
• ???? ???
• ????? (??????)
• Noise Figure lt 3dB - ????? ????? ???

3
???? ????????? ????

• ????? ??????? ???, ???? ???? ?? ???? ?????
  ????????? (?????? ????, ????? ) ???
  ?????? ?? ??????? ?? ??? ??? ??? ????? ??????
  ??????? ?? ?????? ????? ?????? ???? ???? ???.
• ?? ??, ??? ????? ????? ???, ??? ??????? ?????.
  ????, ????? ?? ???? ????? ????? ??? ?? ?????
  ????? ??? ???? ??? ??????.
• ???? ??? ???? ????? ?????? ?? LNAs ? CMOS.

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Tradeoff ??? Noise Factor ?????? ????????? ?LNAs
?????????
CS Shunt Feedback
CG

• ?????? ?????????
• ??????? ??
• ? Tradeoff
• ?????, ??? F (noise factor)
• ???? ????? ????? ?????????? (ZinRs) ?????
  ?????? ?? ???? NFlt3dB.
• ????? ????? ?? ??????? ?????? (????? ? i), ?????
  ?"? ????? ?????? (?????, gm,i 1/Rs , RiRs)

CS
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????? ?? Wideband LNAs ????????? - ????

• NEF (Noise Excess Factor)
• ??? ?????? ??? ????
• ?? ??? ???? ???? ???????? R1/gm
• ?????? ???? (?????) ?????
• ??????
• ????? ????? ???? VDS0
• ??? ????? (????????)
• ???? MOSFET ???? ???? ??? ???????
• ???? ? ?-
• ?? ? NEFgt1
• ???? ???
• NEF1
• ????? ?-NEF ???? ???? Noise Figure

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????? ?? Wideband LNAs ????????? - ????

• ??? ????? ?????? ???? ?????? ???? ????? ????
  ???? ????? ?????? ???? Rs.
• ?????,
• ???? ??? NEF1 , ???? ????????? MOS NEFgt1.
• ????? ????,
• ???? ?????, ???? ???? ?? ? Tradeoff ??? ?????
  ?????????? ???? Noise Factor.
• ????????, ???? ?? ????, ???? ?? ???????? ??????
  ?????
• ?????, ????? ?????? ???? ?? ?????? ??????
  ???????? ?????? ?? ????? ?????? CMOS.

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????? ?? Wideband LNAs ????????? - ????

• ?????
• ????? ??, ??????? ????? ??????
• ???????
• ????? ??, ????? ???? ??????,
• ???? ??
• ????? ???, ???? ????? NFlt3dB ?????? ?????? ????
  ?? ????????? ? MOS ??? ????.
• ????? ??? ?????? ACL, ???? ????. ??????? ??????
  ????, ???? ???? ????, ?????? ?????? ????? ??
  ?????? (???????) ???? ???? ?????? ?????? ???????
  ?? ???????.

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????? ??????

• ?????
• ???? NFlt3dB ????? ????? ???
• ???? ????? ????????? ?????? ????
• ?? ?????? ????? ??????? (??"? ?? ?????? ??????
  ???????)

9
???? ??????

• ???? ?? ????? ?? ? CS ?? ???? Shunt

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????? ??????

• ????, ?????? ?????, ??????? ????? ??? ???????
  ????? ?????????? ???? ?
• ??? ?? ???? ??? ?????? R ? Rs
• ??? ????? ????????? ??????
• ????? ???, ?? ???? ???????? ????.

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????? ?????? - ????

• ???? ??
• ?????? ?????? ?????, ?? ???? ???? ???? ??? ???
  ???? (???????? ????)
• ?????? ?????? ????? ???? ??? ????????? ??????,
  ??????? X ?-Y ?? ???? ?????? ??????!
• ????? ??, ?????? ??? ???? ?? ????? ???? ?? ????
  ?????? (M1) ????? ?"? ????? ?????.

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????? ?????? ????

• ?????
• ????? ?"? ????? ???? Feed-Forward ????? X
• ??? ???? A ?????? Y ??? ???? ???
• ????
• ????? ????? ?????? ?????
• ????? ????? Alt0, ??? ???? ?? ????
  ?????? ????? ?????? X ?- Y.

Vo
13
????? ?????? ????

• ??? ??, ???? ????? ????? ???? ?????, ?????
• ???? ??, ??? ????? ? ?????? ??? ???? ????,
  ??? ????? ?????? ?? Zin ??? ???? ?? ????? ??????
  ????????? ?????? ???? (Trade-off brakes).
• ?????, ????? ????, ???? ???? ???? ??????? ????? Y
  ?????, ????? ???? ????? ?? ??? ??????? ?????
  ????? ???.

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????? ?????? ????

• ???? ?????? M1 ???? ???? ??? ??? ????? ???? ???
  ???? ????? ?? ? NFigure.
• ? Trade-off ?? ZinRs ?? ?? (gm ?????? ??????
  ???? ????), ????.
• ????? ????? ????? A, ???? ?? ?-NFactor ?? ? LNA.

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?????

• ????? ???? ????
• ???? ????? ????? ?????? ???? ???? ??????.
• ????? ?? ? Trade-Off ??? ????? ????????? ????
  ????? ?? NFlt3dB.
• ?????? ?????, ???? ??????? ????? ??????? (A ???
  "???? ????" ???? ???? ?????) ??? ????? ????? ??
  ?????? ?????? ??????.

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Bibliography

• 2002 IEEE International Solid-State Circuits
  Conference ISSCC 2002 / Session 24 / RF SYSTEMS
  / 24.6
• MESA Research Institute, University of Twente,
  Enschede, The Netherlands
• F. Bruccoleri
• E.A.M Klumperink
• B. Nauta

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??? (?????? ???????)