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 3 of 7 April 2006

AH31

High Dynamic Range IF Amplifier

Product Information

Application Circuit: 65 – 85 MHz (AH31-PCB75)

Typical Performance

Frequency

75 MHz

Gain

19.5 dB

S11

-21 dB

S22

-17 dB

Output P1dB

+22 dBm

Output IP3

+42 dBm

Noise Figure

2.6 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.

S-Parameters

15

16

17

18

19

20

55

65

75

85

95

Frequency (MHz)

-25

-20

-15

-10

-5

0

S11

S22

S21

Noise Figure

1

1.5

2

2.5

3

3.5

55

65

75

85

95

Frequency (MHz)

Output IP3

36

38

40

42

44

46

55

65

75

85

95

Frequency (MHz)

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

Typical Performance

Frequency

170 MHz

Gain

19.2 dB

S11

-13 dB

S22

-14 dB

Output P1dB

+21 dBm

Output IP3

+42 dBm

Noise Figure

2.3 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.

S-Parameters

15

16

17

18

19

20

150

160

170

180

190

Frequency (MHz)

-25

-20

-15

-10

-5

0

S11

S22

S21

Noise Figure

0.0

0.5

1.0

1.5

2.0

2.5

150

160

170

180

190

Frequency (MHz)

Output IP3

36

38

40

42

44

46

150

160

170

180

190

Frequency (MHz)

AH31

RF

C5

.018 F

L1

220 nH

C4

.018 F

L2

330 nH

RF IN

R1

5.1

C3

12 pF

C1

.018 F

R2

0

AH31

RF

C5

.018 F

L1

82 nH

C4

1000 pF

L2

330 nH

RF IN

R1

3.3

C3

4.7 pF

C1

1000 pF

R2

0