Application Note NJG1131HA8 315MHz BAND APPLICATION The characteristics of 315MHz band have evaluated as follows. The evaluation circuit structure and measured data are reviewed. 3-1 MEASURED DATA1 (DC) General conditions: VDD=3.0V, Ta=+25oC, Zs=Zl=50Ω PARAMETERS SYMBOL Supply Voltage VDD Operating Current IDD CONDITIONS RF OFF DATA UNITS 3.0 V 3.89 mA DATA UNITS 315 MHz 3-2 MEASURED DATA2 (RF) General conditions: VDD=3.0, fRF=315MHz, Ta=+25oC, Zs=Zl=50Ω PARAMETERS Frequency Small Signal Gain Noise Figure SYMBOL CONDITIONS fRF Gain Exclude PCB, Connector Losses (0.053dB) 12.03 dB NF Exclude PCB, Connector Losses (0.026dB) 0.98 dB -7.3 dBm +5.2 dBm Input Power 1dB Compression P-1dB(IN) Input 3rd Order Intercept Point IIP3 f1=fRF, f2=fRF+100kHz, Pin=-28dBm RF IN VSWR VSWRi 1.70 - RF OUT VSWR VSWRo 1.34 - 1 Application Note 3-3 NJG1131HA8 APPLICATION CIRCUIT Top View C3 1000pF VG GND 6 RFOUT 1 L3 56nH VDD=3.0V RF OUT 5 L2 220nH Bias Circuit C2 7pF 1Pin index RF IN 2 C1 100pF 3-4 RFIN 4 GND 3 GND L1 100nH PCB DESIGN Top View PARTS LIST VDD Parts ID L1~L3 C3 C1~C3 L3 RF IN Comment TAIYO-YUDEN (HK1005 Series) MURATA (GRM15 Series) C1 L2 L1 C2 RF OUT PCB (FR-4)： t=0.2mm MICROSTRIP LINE WIDTH =0.4mm (Z0=50Ω) PCB SIZE=16.8mm×16.8mm 2 Application Note NJG1131HA8 3-5-1 CHARACTERISTICS General conditions: VDD=3.0V, fRF=315MHz, Ta=+25oC, Zs=Zl=50Ω Pout vs. Pin at 315MHz Gain, IDD vs. Pin at 315MHz 13 5 12 0 Gain (dB) Pout (dBm) -5 -10 Pout -15 8 7 Gain 11 6 10 5 9 4 IDD 8 3 -20 7 -25 2 6 -30 1 P-1dB(IN)=-7.3dBm P-1dB(IN)=-7.3dBm -35 -40 5 -35 -30 -25 -20 -15 -10 IDD (mA) 10 -5 0 -40 0 -35 -30 -25 -20 -15 -10 -5 0 Pin (dBm) Pin (dBm) Pout, IM3 vs. Pin at 315MHz Gain, NF vs. Frequency f1=315MHz, f2=315.1MHz 20 14 3.5 0 Pout Gain (dB) Pout, IM3 (dBm) -20 -40 12 3 10 2.5 8 2 6 1.5 NF (dB) Gain -60 4 IM3 1 NF -80 2 IIP3=+5.2dBm -100 -40 -30 -20 -10 0 0.5 (Exclude PCB, Connector Losses) 10 Pin (dBm) 0 100 150 200 250 300 350 400 450 0 500 Frequency (MHz) K-factor vs. Frequency 20 K-factor 15 10 5 0 0 5000 10000 15000 20000 Frequency (MHz) 3 Application Note NJG1131HA8 3-5-2 CHARACTERISTICS General conditions: VDD=3.0V, Ta=+25oC, Zs=Zl=50Ω S11, S22 S21, S12 VSWR Zin, Zout S11, S22 (~20GHz) S21, S12 (~20GHz) 4