Application Note 5 NJG1108HA8 WiMAX Application 5. WiMAX 1.8GHZ BAND APPLICATION 5-1 SUMMARY The characteristics of WiMAX 1.8GHz band application have evaluated as follows. The evaluation circuit structure and measured data are reviewed. 5-2-1 MEASURED DATA1 (DC) General conditions: VDD=VINV=2.7V, Ta=+25°C, Zs=Zl=50Ω Parameter Symbol Conditions Measurement Unit data Operating Voltage VDD 2.7 V Inverter Voltage VINV 2.7 V Control Voltage (High) VCTL(H) 1.85 V Control Voltage (Low) VCTL(L) 0 V 2.20 mA 0 uA Operating current IDD1 RF OFF, VCTL=1.85V Operating current IDD2 RF OFF, VCTL=0V Inverter current IINV1 RF OFF, VCTL=1.85V 30.2 uA Inverter current IINV2 RF OFF, VCTL=0V 8.0 uA Control current ICTL RF OFF, VCTL=1.85V 5.9 uA 5-2-2 MEASURED DATA2 (RF) General conditions: VDD=VINV=2.7V, VCTL=1.85V, fRF=1770~1805MHz, Ta=+25°C, Zs=Zl=50Ω Measurement Parameter Symbol Conditions data Small signal gain Noise figure Pin at 1dB compression point Input 3rd order intercept point Gain NF Exclude PCB, Connector Losses (0.05dB) P-1dB(IN) IIP3 f1=fRF, f2=fRF+100kHz, Pin=-34dBm Unit 17.8 ~ 17.9 dB 0.91 ~ 0.97 dB -13.7 ~ -13.3 dBm +1.6 ~ +1.8 dBm RF Input port VSWR VSWRi 2.09 ~ 2.11 RF Output port VSWR VSWRo 1.78 ~ 1.90 1 Application Note 5 NJG1108HA8 5-3 APPLICATION CIRCUIT (Top View) GND 3 L2 6.8nH RFIN RFOUT 4 RF IN L4 12nH C1 100pF 2 L1 39nH RF OUT L3 12nH VDD=2.7V C2 1000pF Bias Circuit GND VINV Logic Circuit 5 1 VINV=2.7V C3 1000pF VCTL 6 VCTL=0V or 1.85V C4 1000pF 5-4 PCB DESIGN (Top View) Parts List Parts ID L1 ~ L4 VDD C1 ~ C4 Comment MURATA (LQP03T Series) MURATA (GRM03 Series) C2 L2 RF IN L1 C4 VCTL L3 L4 C1 RF OUT C3 VINV PCB (FR-4): t=0.2mm MICROSTRIP LINE WIDTH =0.4mm (Z0=50Ω) PCB SIZE=17.0mm x 17.0mm CAUTION In order not to couple with terminal RFIN and RFOUT, please layout ground pattern under the IC. 2 Application Note 5 NJG1108HA8 5-5-1 Typical Characteristics Condition: Ta=+25oC, VDD=VINV=2.7V, VCTL=1.85V, Zs=Zl=50Ω S11, S22 S21, S12 VSWR Zin, Zout S11, S22 (f=50MHz~20GHz) S21, S12 (f=50MHz~20GHz) 3 Application Note 5 NJG1108HA8 5-5-2 Typical Characteristics 10 Pout vs. Pin Gain, IDD vs. Pin (VDD=VINV=2.7V, V CTL=1.85V, fRF=1787.5MHz) (VDD=VINV=2.7V, V CTL=1.85V, fRF=1787.5MHz) 22 Gain (dB) Pout -5 -10 -15 P-1dB(IN)=-13.3dBm -20 -25 -40 -30 -20 -10 0 18 6 16 5 IDD 14 12 3 10 2 8 0 -30 -20 Pin (dBm) 10 Pout, IM3 vs. Pin (VDD=VINV=2.7V, V CTL=1.85V) (VDD=VINV=2.7V, VCTL=1.85V, fRF=1787.5+1787.6MHz) 20 20 19 17 2 16 15 NF Pout, IM3 (dBm) 2.5 1.5 0 18 Gain (dB) Gain 3 Pout -20 -40 -60 14 13 (NF:Exclude PCB, Connector Losses) 0 1.65 0 Pin (dBm) 3.5 0.5 -10 NF, Gain vs. frequency 4 1 1 P-1dB(IN)=-13.3dBm 6 -40 10 4 1.7 1.75 1.8 IDD (mA) Gain 0 Pout (dBm) 7 20 5 Noise Figure (dB) 8 1.85 12 1.9 frequency (GHz) IM3 IIP3=+1.7dBm -80 -100 -40 -30 -20 -10 0 10 Pin (dBm) k factor vs. frequency (VDD=VINV=2.7V, VCTL=1.85V) 20 k factor 15 10 5 0 0 5 10 15 20 frequency (GHz) 4