Application Note 2 NJG1108HA8 WiMAX Application 2. WiMAX (2.6GHz BAND) APPLICATION 2-1 SUMMARY The characteristics of WiMAX application (2.496~2.69GHz) have evaluated as follows. The evaluation circuit structure and measured data are reviewed. 2-2-1 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 2.04 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 28.8 uA Inverter current IINV2 RF OFF, VCTL=0V 8.0 uA Control current ICTL RF OFF, VCTL=1.85V 5.6 uA 2-2-2 MEASURED DATA2 (RF) General conditions: VDD=VINV=2.7V, VCTL=1.85V, fRF=2600MHz, Ta=+25°C, Zs=Zl=50Ω Measurement Unit Parameter Symbol Conditions data Small signal gain Gain Gain flatness Gflat Noise figure NF Pin at 1dB compression point Output 3rd order intercept point Input 3rd order intercept point fRF=2496~2690MHz Exclude PCB, Connector Losses (0.11dB) P-1dB(IN) OIP3 IIP3 f1=fRF, f2=fRF+100kHz, Pin=-30dBm f1=fRF, f2=fRF+100kHz, Pin=-30dBm 14.9 dB 0.4 dB 1.56 dB -10.7 dBm +18.3 dBm +3.4 dBm RF Input port VSWR VSWRi 1.86 RF Output port VSWR VSWRo 1.84 1 Application Note 2 NJG1108HA8 2-3 APPLICATION CIRCUIT (Top View) 3 GND L2 3nH RFIN RF IN L4 5.1nH RFOUT 4 C1 100pF RF OUT 2 L1 10nH L3 2.4nH C2 1000pF Bias Circuit GND VDD=2.7V VINV Logic Circuit 5 VINV=2.7V 1 C3 1000pF 6 VCTL VCTL=0V or 1.85V 2-4 PCB DESIGN (Top View) Parts List Parts ID L1~L4 VDD C1~C3 C2 L2 RF IN L1 Comment MURATA (LQP03T Series) MURATA (GRM03 Series) L3 L4 C1 RF OUT C3 VCTL VINV PCB (FR-4): t=0.2mm MICROSTRIP LINE WIDTH =0.4mm (Z0=50Ω) PCB SIZE=17.0mm x 17.0mm 2 Application Note 2 NJG1108HA8 2-5-1 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 2 NJG1108HA8 2-5-2 Typical Characteristics Gain, IDD vs. Pin Pout vs. Pin (VDD=VINV=2.7V, VCTL=1.85V, fRF=2600MHz) 10 20 8 5 18 7 Pout Gain (dB) -5 -10 -15 P-1dB(IN)=-10.7dBm -20 -25 -40 -30 -20 -10 14 12 4 10 3 8 2 0 -30 -20 Pout -20 OIP3 (dBm) Pout, IM3 (dBm) 10 (VDD=VINV=2.7V, VCTL=1.85V, df=100kHz, Pin=-30dBm) 20 -40 IM3 24 14 22 12 20 10 OIP3 18 8 16 6 IIP3 14 4 12 2 10 0 IIP3=+3.4dBm -80 -100 -40 -30 -20 -10 0 8 2.4 10 2.45 2.5 2.6 2.65 2.7 2.75 -2 2.8 k factor vs. frequency NF, Gain vs. frequency (VDD=VINV=2.7V, VCTL=1.85V) 16 Gain 15 15 2.5 14 2 13 NF 1.5 12 1 11 k factor 3 (VDD=VINV=2.7V, VCTL=1.85V) 20 Gain (dB) 3.5 2.55 frequency (GHz) Pin (dBm) Noise Figure (dB) 0 OIP3, IIP3 vs. frequency Pout, IM3 vs. Pin (VDD=VINV=2.7V, VCTL=1.85V, fRF=2600+2600.1MHz) -60 -10 Pin (dBm) Pin (dBm) 0 1 P-1dB(IN)=-10.7dBm 4 -40 10 5 IDD 6 0 6 IIP3 (dBm) Pout (dBm) Gain 16 0 IDD (mA) (VDD=VINV=2.7V, VCTL=1.85V, fRF=2600MHz) 10 5 (NF: Exclude PCB, Connector Losses) 0.5 2.4 2.45 2.5 2.55 2.6 2.65 2.7 frequency (GHz) 2.75 10 2.8 0 0 5 10 15 20 frequency (GHz) 4