FP31QF_06 Datasheet, PDF (10/12 Pages) WJ Communication. Inc. – 2-Watt HFET

FP31QF
2-Watt HFET
The Communications Edge ^TM
Product Information
Reference Design: 3500 MHz
The application circuit is matched for output power.
Typical RF Performance
Drain Bias = +9 V, I_ds = 450 mA, 25 °C
Frequency
MHz 3500
S21 – Gain
dB 11.9
S11 – Input Return Loss
dB -16
S22 – Output Return Loss dB -8.8
Output P1dB
dBm +33.5
Output IP3
(+18 dBm / tone, 1 MHz spacing)
dBm +45
The 3.5 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
3.3 3.35 3.4 3.45 3.5 3.55 3.6 3.65 3.7
Frequency (GHz)
C3
C2
Circuit Board Material: .014” FR-4 (εr = 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.
Bill of Materials
Ref. Desig.
Value
C1, C4, C8, C10 22 pF
C2
0.9 pF
C3
1.0 pF
C7, C11
1000 pF
C12
0.1 µF
L1, L2
6.8 nH
L3
3.3 nH
R1
2.2 Ω
R2
50 Ω
Q1
FP31QF
C5, C6
Part style
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
0603
1206
0805
0603
0603
0603
QFN 6x6
• Both the C2 and C3 placements are between the first and second via locations
along the main microstrip line leading from the FP31QF device. Further
descriptions are shown in the diagram on the left.
• 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.
ID=C8
ID=C7
C=22 pF C=1000 pF
Vds=9V @ 450 mA
-Vgg
ID=C11
C=1000 pF
ID=R2
R=51 Ohm
ID=C12
C=1e4 pF
ID=C10
C=22 pF
ID=C1
C=22 pF
ID=L3
L=3.3 nH
TLIN
Z0=50 Ohm
EL=55 Deg
F0=3.5 GHz
ID=R1
R=2.2 Ohm
ID=C2
C=0.9 pF
ID=L1
L=6.8 nH
NET="FP31QF"
2
1
TLIN
Z0=50 Ohm
EL=5.9 Deg
F0=3.5 GHz
ID=L2
L=6.8 nH
TLIN
Z0=50 Ohm
EL=12.8 Deg
F0=3.5 GHz
ID=C4
C=22 pF
ID=C3
C=1 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
Page 10 of 12 October 2006