AH31
High Dynamic Range IF Amplifier
Product Information
Reference Design: 870 – 960 MHz
Typical Performance
Frequency
900 MHz
16.8 dB
S21
-14 dB
S11
-11 dB
S22
Output P1dB
+21 dBm
Output IP3
+41 dBm
Noise Figure
2.1 dB
Bias
5 V @ 150 mA
V
S
= +5 V
I
D
= 150 mA
C5
.01
µF
C6
100 pF
C1
100 pF
RF IN
L1
12 nH
AH31
C2
2.4 pF
R2
5.1
Ω
C4
100 pF
L2
39 nH
RF OUT
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. All components are of size 0603.
4. This is a reference design only. Sample evaluation boards are not readily available for this circuit. The actual implementation can be achieved
by requesting an AH31 Evaluation board (any frequency) and replacing the passive components with the values given above.
Gain vs Frequency
20
18
Gain (dB)
16
14
12
10
800
850
900
Frequency (MHz)
950
1000
25
°
C
S11, S22 vs Frequency
0
S11, S22 (dB)
-5
-10
-15
S11
-20
800
850
900
Frequency (MHz)
950
1000
S22
25
°
C
Typical Device Data
S-Parameters (V
D
= +5 V, I
D
= 150 mA, T = 25°C, calibrated to device leads)
Freq (MHz)
S11 (dB)
S11 (ang)
S21 (dB)
S21 (ang)
S12 (dB)
S12 (ang)
S22 (dB)
S22 (ang)
50
100
200
300
400
500
600
700
800
900
1000
-2.89
-2.89
-2.93
-2.96
-3.01
-3.10
-3.16
-3.23
-3.24
-3.30
-3.38
-5.15
-8.61
-16.91
-25.39
-33.42
-41.65
-49.82
-57.37
-65.10
-72.57
-79.77
16.14
16.07
15.99
15.90
15.78
15.72
15.54
15.25
15.14
14.98
14.74
175.42
173.09
167.64
162.22
156.27
150.37
144.69
139.50
134.31
129.13
124.24
-29.18
-29.05
-28.46
-27.82
-27.04
-26.35
-25.57
-24.79
-24.33
-23.74
-23.15
5.50
8.21
13.72
17.52
20.10
22.46
23.12
22.98
21.53
19.94
18.03
-11.16
-11.42
-11.47
-11.60
-11.73
-11.88
-12.01
-12.22
-12.37
-12.50
-12.67
-10.29
-11.71
-17.87
-25.22
-32.59
-40.41
-48.04
-55.71
-62.56
-69.95
-77.38
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
February 2004
WJCI [ WJ COMMUNICATION. INC. ]
