射频链路指标预算.

• G=-15.5dB，NF=33.5，OIP3=33.8，Pout=0
接收通道链路预算
Pin RX Device Gain NF LNA 30 PI -2 HMC485 -9 LPF -1 PI -2 BIF3 20 HMC472 0 SAWFILTER -10 PI -3 BIF3 20 pxv1220s -3 BIF3 20 LPF -1 PI -3 ETC412 -1.5 -125
3 3.001272909 3.025152524 3.032200935 3.052183043 3.17528216 3.17528216 3.180005644 3.185223119 3.209317466 3.209420929 3.209900305 3.209900842 3.209903441 3.20990559
S IP3
30 28 18.96564 17.96564 15.96564 34.51999 31.74307 21.74307 18.74307 36.31592 33.31592 39.80218 38.80218 35.80218 34.30218
Pout
-95 -97 -106 -107 -109 -89 -89 -99 -102 -82 -85 -65 -66 -69 -70.5
• G=10dB，NF=18.9，OIP3=31.5，Pout=-3.5
反馈通道链路预算
Pin CP Device HMC472 HMC349 HMC485 LPF PI BIF3 LPF PI ETC412 15.5 Gain -17 -1 -9 -1 -1 16 0 -1 -1.5 NF 17 1 9 1 1 4.5 0 1 1.5 IP3 35 49 40 100 100 40 100 100 100 S Gain -17 -18 -27 -28 -29 -13 -13 -14 -15.5 S NF 17 18 27 28 29 33.5 33.5 33.51001056 33.5300205 S IP3 35 33.86479 24.73366 23.73366 22.73366 36.31054 36.31054 35.31054 33.81053 Pout -1.5 -2.5 -11.5 -12.5 -13.5 2.5 2.5 1.5 0
射频链路指标预算
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目录
• • • • • • • • • • • • • • • 中频盘链路构成 OIP3与NF计算公式 发射通道链路预算 反馈通道链路预算 接收通道链路预算 基本公式 ACPR分析 本振泄露分析 DPD通道分析 接收灵敏度分析 阻塞与反混叠滤波器分析 互调分析 半中频杂散分析 LC滤波器设计 滤波器带宽要求
中频盘链路构成
OIP3与NF计算公式
• 以两阶系统为例：
发射通道链路预算
Pin TX Device Gain NF LPF -1 TRF3703 1 PI -5 RFFILTER -4 PI -4 BG18C 15.5 HMC472 -3 PI -3 BG18C 15.5 PI -2 -13.5 IP3 1 11 5 4 4 4.5 3 3 4.5 2 100 23 100 100 100 40 35 100 40 100 S Gain -1 0 -5 -9 -13 2.5 -0.5 -3.5 12 10 S NF 1 12 12.5554288 13.57786519 15.4159865 18.51766142 18.55172197 18.61889373 18.8553251 18.85741066 S IP3 100 23 18 14 10 25.34858 22.11891 19.11891 33.51415 31.51415 Pout -14.5 -13.5 -18.5 -22.5 -26.5 -11 -14 -17 -1.5 -3.5
ACPR分析
ACPR analysis KTB SAMPLE CLK (M) BW IF (M) CLK NOISE DAC NOISE CLK TO DAC NOISE DAC OUTPUT NOISE BW GAIN DAC NOISE FLOOR CHANNEL NF CHANNEL GAIN CHANNEL OIP3 SIGNAL POWER SIGNAL Noise KTB Noise SIGNAL NF CHANNEL OIP3 TO ACPR MAX P3rd Total CHANNEL Noise CHANNEL MAX ACPR LOG or F MAGNITUDE -174 3.98107E-18 737.28 3840000 140 -145 -158 1.58489E-16 -159.43 1.14023E-16 -155.583 2.76493E-16 65.84331 -89.7398 1.06173E-09 18.86 10 31.5 -3.5 -79.7398 1.06173E-08 -79.2967 1.17579E-08 -76.5023 2.23753E-08 -70 -73.5 4.46684E-08 -71.7364 6.70436E-08 -68.2364
• G=54.5dB，NF=3.21，OIP3=34.3
基本公式
• • • • • • • 系统ACPR = RF Power – 热噪声 – NF - 信号底噪 – 最大非线性产物 接收灵敏度 = 热噪声 + NF + SNR – 处理增益 OIP3 = RF Power + IMD3/2，IMD3 = RF Power – 最大非线性产物 最大非线性产物 = RF Power – 2*(OIP3 - RF Power ) OIP3 = IIP3 + G，IIP3 = RF Power(Input) + IMD3/2(Input) 接收系统串联IIP2 = 2*RF Power + Pr = RF Power + IMR2 IMR2 = RF Power - Pr
IP3
3 2 9 1 2 5.2 0 10 3 5.2 3 5.2 1 3 1.5 30 100 40 100 100 40 35 100 100 40 100 40 100 100 100
Байду номын сангаас
S Gain
30 28 19 18 16 36 36 26 23 43 40 60 59 56 54.5
S NF