Lect8_LNAs II

Lect8_LNAs II - ECE 894 RF and mmWave Front-end Circuit...

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ECE 894 RF and mmWave Front-end Circuit Design Prof. Waleed Khalil Lecture LNAs II 8 1
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Source Degenerated LNA : Finite Q 2 2 1 1 res g res s res ms s Lg Ls T L L F gR RQ Q ω ωω γ αω  ≥+ + +   C GS g m v gs R s i ns 2 L g L s i nd 2 R Lg R Ls L s L g R L Z in v s R s Q Lg Q Lg
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BW Enhancement: Shunt Peaking 3 ( ) ( ) ( ) ( ) 2 2 2 2 2 22 2 2 1 1 1 1 1 L LR ZR LC RC mm m RC m ω ωω + = −+  = +++ ++ +   = R v s C R v s C L CS CS w/ Shunt Peak. Gain CS Shunt Peak. ω 1 ω 2 Peaking ω 1 = 1/RC m ω 2 / ω 1 Peaking 1.41 1.85 20% Max. BW 2.0 1.8 3% Optimum BW/Peak 2.41 1.72 0% Max. Flat Freq. Resp. 3.1 1.6 0% Max. Flat G. Deley
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BW Enhancement: Series Peaking 4 RC m LR = CS w/ Series Peak. Gain CS Series Peak. ω 1 ω 2 Peaking ω 1 = 1/RC m ω 2 / ω 1 Peaking 2.0 √2 0 Max. BW/ Max. Flat Freq.Resp. 3.0 1.36 0 Max. Flat Freq.Resp./ Max. Flat G. Deley R v s C L
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BW Enhancement: Shunt & Series Peaking 5 Shunt & Series Peak. R C L 1 L 2 R v s C L 1 L 2 L 3 Shunt & Double Series Peak.
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Lect8_LNAs II - ECE 894 RF and mmWave Front-end Circuit...

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