FP31QF
2-Watt HFET
The Communications Edge
TM
Product Information
Application Circuit: 1930 – 1960 MHz (FP31QF-PCB1900)
The application circuit is matched for output power.
Typical RF Performance
Drain Bias = +9 V, I
ds
= 450 mA, 25°C
Frequency
S21 – Gain
S11 – Input Return Loss
S22 – Output Return Loss
Output P1dB
Output IP3
(+18 dBm / tone, 1 MHz spacing)
MHz
dB
dB
dB
dBm
dBm
dB
dBm
1930
14
-17
-11
+33.5
4.3
1960
13.8
-21
-11
+33.8
+46.8
4.5
+27.3
1990
13.8
-27
-13
+33.8
4.4
Noise Figure
IS-95 Channel Power
@ -45 dBc ACPR
Bill of Materials
Ref. Desig.
C1, C4, C8, C10
C2
C3
C6, C11
C7
C12
L1, L2
L3
R1
R2
Q1
C5
•
•
•
•
Value
22 pF
2.2 pF
2.0 pF
0.018
µF
1000 pF
0.1
µF
12 nH
4.7 nH
5.1
Ω
51
Ω
FP31QF
Part style
Chip capacitor
Chip capacitor
Chip capacitor
Chip capacitor
Chip capacitor
Chip capacitor
Wirewound chip inductor
Multilayer chip inductor
Chip resistor
Chip resistor
WJ 2W HFET
Do Not Place
Size
0603
0603
0603
0805
0603
1206
0805
0603
0603
0603
QFN 6x6
C2
C3
Circuit Board Material: .014” FR-4 (ε
r
= 4.6),
4 layers (other layers added for rigidity), .062” total thickness, 1 oz copper
The main microstrip line has a line impedance of 50
Ω.
The C2 and C3 placements are at silk screen markers, “B” and “3”, respectively.
The via hole spacing along the main microstrip line is .040”.
The distance from the edge of the FP31QF to the closer edge of L3 is .305”.
The transmission line lengths shown in the schematic are from the FP31QF
device edge to the component edge.
CA P
CA P
CAP
ID=C6
ID =C7
ID=C8
C=2 2 pF C =100 0 pF C=1.8e 4 pF
-Vgg
Vds=9V @ 450 mA
CAP
ID=C12
C=1e 5 pF
RES
ID=R2
R=51 Ohm
CAP
ID=C11
C=1.8e 4 pF
CAP
ID =C10
C =2 2 pF
CAP
ID=C5
C=DNP pF
TLINP
ID =TL1
Z0 =50 Ohm
L =190 mil
Eeff =3 .46
Loss =0
F0 =0 MHz
P ORT
P =1
Z=50 Ohm
CAP
ID=C1
C=2 2 pF
IND
ID=L3
L =4.7 nH
IND
ID=L1
L =1 2 nH
1
2
IND
ID=L2
L =1 2 nH
CAP
ID=C4
C=2 2 pF
P ORT
P =2
Z=50 Ohm
CA P
ID=C2
C=2.2 pF
RES
ID=R1
R=5 Ohm
SUB CKT
ID=Q1
NET="FP31QF"
TL INP
ID=TL2
Z0 =50 Ohm
L =200 mil
Eeff=3 .46
Loss=0
F0 =0 MHz
CAP
ID=C3
C=2 pF
Specifications and information are subject to change without notice
WJ Communications, Inc
•
Phone 1-800-WJ1-4401
•
FAX: 408-577-6621
•
e-mail: sales@wj.com
•
Web site: www.wj.com
November 2004
WJCI [ WJ COMMUNICATION. INC. ]
