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

FP31QF

2-Watt HFET

Product Information

The Communications Edge

TM

Application Circuit: 1930 – 1960 MHz (FP31QF-PCB1900)

The application circuit is matched for output power.

Typical RF Performance

Frequency

MHz

1930

1960

1990

S21 – Gain

dB

14

13.8

13.8

S11 – Input Return Loss

dB

-17

-21

-27

S22 – Output Return Loss

dB

-11

-11

-13

Output P1dB

dBm

+33.5

+33.8

+33.8

Output IP3

(+18 dBm / tone, 1 MHz spacing)

dBm

+46.8

Noise Figure

dB

4.3

4.5

4.4

IS-95 Channel Power

@ -45 dBc ACPR

dBm

+27.3

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

Part style

Size

C1, C4, C8, C10

22 pF

Chip capacitor

0603

C2

2.2 pF

Chip capacitor

0603

C3

2.0 pF

Chip capacitor

0603

C6, C11

0.018

µF

Chip capacitor

0805

C7

1000 pF

Chip capacitor

0603

C12

0.1

µF

Chip capacitor

1206

L1, L2

12 nH

Wirewound chip inductor

0805

L3

4.7 nH

Multilayer chip inductor

0603

R1

5.1 Ω

Chip resistor

0603

R2

51 Ω

Chip resistor

0603

Q1

FP31QF

WJ 2W HFET

QFN 6x6

C5

Do Not Place

• 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.

RES

R=

ID=

5 Ohm

R1

CAP

C=

ID=

22 pF

C1

IND

L=

ID=

12 nH

L2

CAP

C=

ID =

22 pF

C10

CAP

C=

ID=

1.8e 4 pF

C11

CAP

C=

ID=

1e 5 pF

C12

CAP

C=

ID=

22 pF

C4

CA P

C=

ID=

1.8e 4 pF

C8

CA P

C=

ID=

22 pF

C6

CAP

C=

ID =

100 0 pF

C7

CAP

C=

ID=

2 pF

C3

IND

L=

ID=

12 nH

L1

RES

R=

ID=

51 Ohm

R2

CAP

C=

ID=

DNP pF

C5

IND

L=

ID=

4.7 nH

L3

TL INP

F0 =

Loss=

Eeff=

L=

Z0 =

ID=

0 MHz

0

3.46

200 mil

50 Ohm

TL2

CA P

C=

ID=

2.2 pF

C2

TLINP

F0 =

Loss =

Eeff =

L=

Z0 =

ID =

0 MHz

0

3 .46

190 mil

50 Ohm

TL1

1

2

SUB CKT

NET=

ID=

"FP31QF"

Q1

PORT

Z=

P=

50 Ohm

1

PORT

Z=

P=

50 Ohm

2

-Vgg

Vds=9V @ 450 mA

C2

C3