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

September 2004

The Communications Edge

TM

AH31

High Dynamic Range IF Amplifier

Product Information

Application Circuit: 155 – 185 MHz (AH31-PCB170)

Typical Performance

Frequency

170 MHz

S21 - Gain

19 dB

S11

-18 dB

S22

-20 dB

Output P1dB

+21 dBm

Output IP3

+42 dBm

Noise Figure

1.8 dB

Bias

+5 V @ 150 mA

Notes:

1. The amplifier should be connected directly to a +5 V regulator; no dropping resistor is required.

2. If no DC signal is present at the input (pin 1), C1 can be removed. The gate is internally grounded in the amplifier.

3. R2 is used as a placeholder for a different application circuit. It can be removed from the circuit.

4. C2 (from the silkscreen) is not utilized in this application circuit.

Gainvs Frequency

25

°C

10

12

14

16

18

20

150

160

170

180

190

Frequency (MHz)

S11, S22 vs Frequency

25

°C

-30

-25

-20

-15

-10

-5

0

150

160

170

180

190

Frequency (MHz)

S11

S22

WidebandS-Parameter Performance

25

°C

-30

-20

-10

0

10

20

50

100

150

200

250

300

350

400

Frequency (MHz)

S11

S22

S21

OIP3 vs Frequency

25

°C

36

38

40

42

44

46

150

160

170

180

190

Frequency (MHz)

Noise Figure vs Frequency

25

°C

0

1

2

3

4

5

150

160

170

180

190

Frequency (MHz)

P1dBvs Frequency

25

°C

14

16

18

20

22

24

150

160

170

180

190

Frequency (MHz)

AH31

RF OUT

C5

.018

µF

0603

L1

82 nH

0603

C4

1000 pF

0603

L2

330 nH

0805

RF IN

R1

1.2

Ω

0603

C3

4.7 pF

0603

C1

1000 pF

0603

R2

0

Ω

0603