FP31QF Datasheet, PDF (9/13 Pages) WJ Communication. Inc. – 2-Watt HFET

FP31QF
2-Watt HFET
The Communications Edge ^TM
Product Information
Reference Design: 2400 – 2500 MHz
The application circuit is matched for output power.
Typical RF Performance
Drain Bias = +9 V, I_ds = 450 mA, 25°C
Frequency
MHz 2400 2500
S21 – Gain
dB 12.1 12.0
S11 – Input Return Loss
dB -13 -16
S22 – Output Return Loss dB -13 -17
Output P1dB
dBm
+33.5
Output IP3
(+18 dBm / tone, 1 MHz spacing)
dBm
+46.8
Noise Figure
dB
4.6
The 2.4 – 2.5 GHz Reference Circuit is shown for design purposes only. An
evaluation board is not readily available for this application. The reader can
obtain any FP31QF evaluation board and modify it with the circuit shown to
achieve the performance shown in this reference design.
Measured S-Parameters
15
10
5
0
DB(|S[1,1]|)
DB(|S[2,1]|)
DB(|S[2,2]|)
-5
-10
-15
-20
-25
2.3
2.35
2.4
2.45
2.5
2.55
2.6
Frequency (GHz)
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.
Ref. Desig.
C1, C4, C8, C10
C2, C3
C6, C11
C7
C12
L1, L2
L3
R1
R2
Q1
C5
Bill of Materials
Value
Part style
22 pF
Chip capacitor
1.5 pF
Chip capacitor
0.018 µF Chip capacitor
1000 pF Chip capacitor
0.1 µF
Chip capacitor
12 nH
Wirewound chip inductor
3.3 nH
Multilayer chip inductor
5.1 Ω
Chip resistor
50 Ω
Chip resistor
FP31QF WJ 2W HFET
Do Not Place
Size
0603
0603
0805
0603
1206
0805
0603
0603
0603
QFN 6x6
• The C2 and C3 placements are at silk screen markers, “A” and “2”, 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.
P ORT
P =1
Z=50 Ohm
CAP
ID=C1
C=2 2 pF
IND
ID=L3
L =3.3 nH
CA P
CAP
ID=C6 ID =C7
CA P
ID=C8
C=2 2 pF C =100 0 pF C=1.8e 4 pF
-Vgg Vds=9V @ 450 mA
TLINP
ID =TL1
Z0 =50 Ohm
L =150 mil
Eeff =3 .46
Loss =0
F0 =0 MHz
CAP
ID=C2
C=1.5 pF
RES
ID=R2
R=51 Ohm
CAP
ID=C5
C=DNP pF
IND
ID=L1
L =1 2 nH
2
RES
ID=R1
R=5.1 Ohm
1
SUB CKT
ID=Q1
NET="FP31QF"
IND
ID=L2
L =1 2 nH
TL INP
ID=TL2
Z0 =50 Ohm
L =180 mil
Eeff=3 .46
Loss=0
F0 =0 MHz
CAP
ID=C12
C=1e 5 pF
CAP
ID=C11
C=1.8e 4 pF
CAP
ID =C10
C =2 2 pF
CAP
ID=C4
C=2 2 pF
P ORT
P =2
Z=50 Ohm
CAP
ID=C3
C=1.5 pF
Specifications and information are subject to change without notice
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: [phone] • e-mail: [e-mail] • Web site: www.wj.com
November 2004