Mathcad%20-%20LNA_Wlan

Mathcad%20-%20LNA_Wlan - Design of Common Source Degenerate...

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Design of Common Source Degenerate LNA ---by Yongwang Ding, Feb. 24, 2001. Vin io Lg Ls Cgs Cgd Gm*Vgs Input stage small signal model Rs Design uses TSMC0.25u technology through MOSIS 1. Process parameters The needed equations are: Id=W*Cox*Vsat*(Vod)^2/(Vod+L*Esat) gm=Cox*(W/L)* μ eff*Vod*(1+ ρ /2)/(1+ ρ )^2 μ eff=2*Vsat/Esat ρ =Vod/(L*Esat) Fopt=1+2*Rn*Gopt=1+2/sqrt(5)* ω / ωΤ *sqrt( γ * δ *(1-|c|^2))
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m 10 3 := μ 10 6 := n1 0 9 := p1 0 12 := a1 0 18 := j1 := The process uses minimum length with DL=XL variation λ 0.12 μ := XL 0.03 μ := cox 6.027 m := cov 610 a μ := csb 1792 a p := csbf 406 a μ := μ 0 316 10 4 := Vsat 1.10 10 5 := L 2 λ 2XL + := L31 0 7 × = Esat 2 Vsat μ 0 := Esat 6.962 10 6 × = The short channel effect sets g and d values γ 1 := δ 2 := c is the gate noise correlation coeffecient c j 0.395 := Considering the overlap capacitance on gate coxeff 2 3 cox cov L + := coxeff m 6.051 = Equation and parameters to calculate Rds Rdsw 120 := Prwg 0.5 := Prwb 0.2 := Wr 1 := Phis 0.874 := Rds W Vod , Vs , ( ) Rdsw 1 Prwg Vod + Prwb Phis Vs + Phis () + 10 6 W Wr :=
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Use l to calculate the Rds (parameter from MOSIS TSMC0.25u) Ks 11.8 := NA 2.35 10 23 := ε 0 8.854 p := q 1.602 10 19 := φ on 0.917 := Ni 1.18 10 16 := kds 2Ks ε 0 qNA := φ s 2 0.026 ln NA Ni := φ s 0.874 = λ ds I W , Vod , Vds , () kds 2L Vds Vod φ on + := Rds IW , Vod , Vds , 1 λ ds I W , Vod , Vds , I := ω t1 1 0 11 := Lstest 0.3 n := ω t Lstest 30 = The source impedance is 30 Ω Rs 30 := 2. Calculate NF Fopt is the optimal noise factor, which assumes the perfect input matching Cgs W ( ) coxeff W L := ρ Vod Vod L Esat :=
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gm W Vod , ( ) cox W L μ 0 Vod 1 ρ Vod () 2 + 1 ρ Vod + 2 := Id W Vod , ( ) W cox Vsat Vod 2 Vod L Esat + := ω T W Vod , gm W Vod , Cgs W := Rs 30 = Fmin W Vod , ω , 1 2 5 ω ω T W Vod , γδ 1c 2 + := α 0 Vod 1 ρ Vod 2 + 1 ρ Vod + 2 := Qs W ω , 1 ω Cgs W Rs := Qopt Vod α 0 Vod δ 5 γ 2 := Those Fopt calculations are not accurate Fopt W Vod , ω , 1 16 15 δ γ ω ω T W Vod , 12c δα 0 Vod 2 5 γ + 0 Vod 2 5 γ + 1 2 + := Fopt W Vod , ω , ( ) Fmin W Vod , ω , γ α 0 Vod ( ) gm W Vod , Rs 1 Qopt Vod Qs W ω , 2 + :=
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χ W Vod , ω , () 1 2 c Qs W ω , δα 0 Vod 2 5 γ + 0 Vod 2 5 γ 1Q sW ω , 2 + + := This Fopt calculation is accurate Rg0 0.8 := Fopt W Vod , ω , 1 γ α 0 Vod χ W Vod , ω , Qs W ω , ω ω T W Vod , + Rg0 Rs + := NFmin W Vod , ω , ( ) 10 log Fopt W Vod , ω , := Define the operating frequency for HIPERLAN2 5.2GHz f0 5.2 10 9 := ω 02 π f0 := 3. Power bound design optimization Given a fixed power consumption, the transistor size can be
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This note was uploaded on 10/30/2009 for the course EE 8337 taught by Professor Harjani during the Fall '04 term at Minnesota.

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Mathcad%20-%20LNA_Wlan - Design of Common Source Degenerate...

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