Application Note NJG1130KA1 GPS L2 Band Application This is L2 Band (1.227GHz) application note of NJG1130KA1. This application note shows the typical electrical characteristics and application circuit. 1. Electrical Characteristics General conditions: Ta=+25°C, VDD=2.85V, fRF=1227MHz, Zs=Zl=50Ω, with application circuit Measurement Units Parameters Symbol Conditions Data Operation current IDD RF OFF 5.03 mA Small signal gain Gain 31.4 dB Exclude PCB and connector Noise figure NF 1.02 dB losses (0.10dB) Output power at 1dB P-1dB +9.6 dBm compression point 3rd order output intercept f=1227+1227.1MHz、 OIP3 +14.8 dBm point Pin=-35dBm VSWRi Input VSWR 2.30 VSWRo Output VSWR 1.49 2. Application Circuit (Top View) L1 4 RFIN 3 AMP L3 VDD C2 L2 5 2 C3 6 AMP L4 1 R1 RFOUT C1 NOTES: ・ L1 and L2 form the input matching circuit. The LNA has integrated coupling and DC-blocking capacitor at the input. st nd ・ L3 is a matching inductor of the integrated 1 amplifier and 2 amplifier. It should be connected to the terminal3 as close as possible. ・ L4 is an output matching inductor. ・ C1 is a coupling and DC-blocking capacitor at the output. ・ C2 and C3 are bypass capacitors. They should be connected between L3 and L4. C2 should be placed to the side of L3, and C3 should be placed to the side of L4, and should not be directly connected L3 and L4. ・ R1 is a stability resistor at high frequency, and it should be connected to the terminal1. ・ Ground terminal (No.2, 5, 6) should be connected to the ground plane as close as possible for good RF performance. ・ For good performance, the terminal1,3 and 4 should not be coupled though floating-capacitance which exists between RF transmission lines. 1 Application Note NJG1130KA1 3. TEST PCB LAYOUT (Top View) ■Parts List PART ID Constants 備考 L1 15nH TAIYO-YUDEN HK1005 L2 27nH TAIYO-YUDEN HK1005 L3 10nH TAIYO-YUDEN HK1005 L4 33nH TAIYO-YUDEN HK1005 C1 100pF MURATA GRM15 C2 1000pF MURATA GRM15 RF OUT C3 1000pF MURATA GRM15 R1 27ohm 1005size VDD C2 L2 RF IN L1 L3 C3 L4 R1 C1 PCB (FR-4)： t=0.2mm MICROSTRIP LINE WIDTH =0.4mm (Z0=50Ω ) PCB SIZE =17.0mm×17.0mm C1 Terminal3 L2 L3 L1 Terminal4 R1 Terminal1 Ground plane PRECAUTION: [1] For good performance, the terminal1, 3 and 4 should not be coupled though floating-capacitance which exists between RF transmission lines. [2] In order not to couple with terminal 1, 3 and 4, please layout ground pattern under the IC. [3] C2 should be placed to the side of L3, and C3 should be placed the side of L4. They should be connect between L3 and L4, should not be directly connected L3 and L4. 2 Application Note NJG1130KA1 4.1 ELECTRICAL CHARACTERISTICS Pout vs. Pin Gain, IDD vs. Pin (VDD=2.85V, fRF=1227MHz) (VDD=2.85V, fRF=1227MHz) 35 25 20 Gain 15 30 30 25 20 Gain (dB) 5 0 IDD (mA) P-1dB(OUT)=+9.6dBm 10 Pout (dBm) 40 Pout 20 -5 10 IDD -10 P-1dB(IN)=-20.8dBm -15 -40 -30 -20 -10 P-1dB(IN)=-20.8dBm 15 -40 0 0 -30 Pin (dBm) NF, Gain vs. frequency Pout, IM3 vs. Pin (VDD=2.85V) (VDD=2.85V, fRF=1227MHz+1227.1MHz) 40 32 20 28 NF 26 1.0 24 0.5 Gain (dB) 30 2.0 NF (dB) 34 Pout, IM3 (dBm) Gain 1.5 1.15 1.20 1.25 0 0 OIP3=+14.8dBm Pout -20 -40 IM3 -60 (Exclude PCB, Connector Losses) 0.0 1.10 -10 Pin (dBm) 3.0 2.5 -20 1.30 1.35 IIP3=-16.7dBm 22 1.40 -80 -40 -30 -20 -10 0 Pin (dBm) frequency (GHz) k factor vs. frequency (VDD=2.85V) 20 k factor 15 10 5 0 0 5 10 15 20 frequency (GHz) 3 Application Note NJG1130KA1 4.2 ELECTRICAL CHARACTERISTICS Condition：Ta=+25oC, VDD=2.85V, Zs=Zl=50ohm S11, 22 VSWR S11, S22 (f=50MHz~20GHz) S21, 12 Zin, Zout S21, S12 (f=50MHz~20GHz) 4