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

Page 6 of 7 April 2006

AH31

High Dynamic Range IF Amplifier

Product Information

Broader Bandwidth Reference Designs

The AH31 can be designed to achieve good performance over a broader frequency range (around one octave) by using an

additional L-C matching network at the input. An equalization R-C network can also be added at the output to slightly flatten

out the typical downward slope of the amplifier circuit.

Reference Design: 36 - 56 MHz

CAP

ID=C4

C=10000 pF

CAP

ID=C3

C=12 pF

CAP

ID=C2

C=47 pF

IND

ID=C1

L=220 nH

IND

ID=L1

L=560 nH

IND

ID=L2

L=560 nH

CAP

ID=C5

C=10000 pF

RES

ID=R1

R=3.3 Ohm

SUBCKT

ID=S1

NET="AH31"

PORT

P=1

Z=50 Ohm

PORT

P=2

Z=50 Ohm

+5V

30

35

40

45

50

55

60

Frequency (MHz)

S-Parameters

16

17

18

19

20

21

-25

-20

-15

-10

-5

0

DB(|S(1,1)|) (R)

DB(|S(2,2)|) (R)

DB(|S(2,1)|) (L)

Reference Design: 45 - 90 MHz

CAP

ID=C4

C=10000 pF

IND

ID=L1

L=330 nH

CAP

ID=C3

C=10 pF

CAP

ID=C2

C=33 pF

IND

ID=C1

L=120 nH

IND

ID=L2

L=330 nH

CAP

ID=C5

C=10000 pF

RES

ID=R1

R=3.3 Ohm

RES

ID=R2

R=20 Ohm

CAP

ID=C7

C=180 pF

SUBCKT

ID=S1

NET="AH31"

PORT

P=1

Z=50 Ohm

PORT

P=2

Z=50 Ohm

+5 V

0.04

0.05

0.06

0.07

0.08

0.09

0.1

Frequency (GHz)

S-Parameters

14

15

16

17

18

19

-25

-20

-15

-10

-5

0

DB(|S(1,1)|) (R)

DB(|S(2,1)|) (L)

DB(|S(2,2)|) (R)

Reference Design: 65 - 165 MHz

CAP

ID=C4

C=10000 pF

IND

ID=L1

L=180 nH

CAP

ID=C3

C=3.9 pF

CAP

ID=C2

C=15 pF

IND

ID=C1

L=100 nH

IND

ID=L2

L=330 nH

CAP

ID=C5

C=10000 pF

RES

ID=R1

R=3.3 Ohm

SUBCKT

ID=S1

NET="AH31"

PORT

P=1

Z=50 Ohm

PORT

P=2

Z=50 Ohm

+5V

0.06

0.08

0.1

0.12

0.14

0.16

0.18

Frequency (GHz)

S-Parameters

15

16

17

18

19

20

-25

-20

-15

-10

-5

0

DB(|S(1,1)|) (R)

DB(|S(2,1)|) (L)

DB(|S(2,2)|) (R)

Reference Design: 80 - 200 MHz

CAP

ID=C4

C=10000 pF

IND

ID=L1

L=150 nH

CAP

ID=C2

C=2.7 pF

CAP

ID=C1

C=12 pF

IND

ID=C1

L=82 nH

IND

ID=L2

L=330 nH

CAP

ID=C5

C=10000 pF

RES

ID=Rs1

R=3.3 Ohm

SUBCKT

ID=S1

NET="AH31"

PORT

P=1

Z=50 Ohm

PORT

P=2

Z=50 Ohm

+5V

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0.2

0.22

Frequency (GHz)

S-Parameters

15

16

17

18

19

20

-25

-20

-15

-10

-5

0

DB(|S(1,1)|) (R)

DB(|S(2,1)|) (L)

DB(|S(2,2)|) (R)