WJ Communications, Inc. Phone: 1-800-WJ1-4401 FAX: 408-577-6621 e-mail: sales@wj.com Web site: www.wj.com
October 2002
AH2
Product Description
The AH2 is a general purpose, high dynamic range
amplifier targeting cable TV markets. The combination
of gain flatness, high linearity and bandwidth make it
ideal for CATV distribution, cable modem and laser
diode driver applications. The AH2 is designed for
75 ohm systems and can operate directly from
a +5 Volt DC regulator. The device is manufactured
using reliable GaAs MESFET technology and boasts
an MTTF of >100 years at a mounting temperature of
85C. All devices are 100% RF and DC tested.
Product Features
50-860 MHz
-71 dBc CTB
-48 dBc CSO
+20 dBm P1dB
+40 dBm Output IP3
14.5 dB Gain
MTTF >100 Years
+5 V Single Positive Supply
Functional Diagram
Absolute Maximum Ratings
Parameter
Rating
Operating Case Temperture
-40 to +85C
Storage Temperature
-40 to +125C
DC Voltage
+6.0 V
RF Input Power (continuous)
+10 dBm
Operation of this device above any of these parameters may cause permanent damage.
Ordering Information
Part No.
Description
AH2
High Dynamic Range CATV Amplifier
(Available in tape and reel)
AH2-PCB
Fully Assembled Single Ended CATV
Application Circuit (75
)
1
2
3
4
Function
PIN No.
Input
Ground
Output/Bias
Ground
1
2
3
4
High Dynamic Range CATV Amplifier
The Communications Edge
TM
Typical Parameters
Parameter
Units Typical Condition
Frequency MHz
50-860
S21 - Gain
dB
14.5
50 MHz
S21 - Gain
dB
13.2
860 MHz
S11 - Input Return Loss
dB
-14
S22 - Output Return Loss
dB
-17
Output IP3
dBm
+40
See Note 2
Output IP2
dBm
+47
P1dB dBm
+20
Noise Figure
dB
3.5
CTB dBc -71 See Note 5
CSO dBc -48 See Note 5
Xmod dBc -65 See Note 5
Test Conditions unless otherwise noted:
4. T=25C, Vdd = 5.0V in a 75
application circuit (AH2-PCB).
5. 77 Channels 50-550 MHz, +34 dBmV/channel, flat-loading.
Specifications
Parameter Units
Min. Typ. Max. Condition
Frequency Range
MHz
50-860
S21
dB
13
14.5
Output IP3
dBm
+37
+40 See Note 2
P1dB
dBm
+21
Operating Current
mA
120
150 180
Supply Voltage
V
+5
Max. Junction Temp.
C
160 See Note 3
Thermal Resistance
C/W
59
Test Conditions unless otherwise noted.
1.
Parameters reflect performance of a packaged device in a 75
system at 25C, Vdd = 5.0V, and 800 MHz.
2. OIP3 measured with 2 tones at an output power of 5 dBm/tone separated by 10 MHz. The
suppression on the largest IM3 product is used to calculate the OIP3 using a 2:1 slope rule.
3. The maximum junction temperature ensures a minimum MTTF rating of 1 million hours of usage
at a tab temperature of +85C. The MTTF plot and more information is located in the
WJ Application Note "AH2 Temperature Effects on Reliability" for more information.
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
October 2002
AH2
Single - Ended CATV, 75
Evaluation Circuit: 50-860 MHz (AH2 - PCB)
Typical Performance (75 Ohm System)
Frequency MHz 50 450 750 860
S21 dB 14.5 14.5 13.7 13.2
S11 dB -11.1 -12.7 -14.5 -18.3
S22 dB -9.5 -22.9 -12.3 -10.6
OIP2 dBm +46.8 +46.9 +47.7 +48.1
OIP3 dBm +39.8 +40.7 +41.0 +40.8
Noise Figure dB 3.9 3.1 3.2 3.2
Bias Vdd = 5 V, Id = 150 mA
Schematic
C1
1000 pF
0603
RF IN
C2
2.2 pF
0603
L1
12 nH
0603
AH2
3 or moreVia
Grounds req.
L2
270 nH
1008
C4
1000 pF
0603
C3
1000 pF
0603
RF OUT
DC +5 V
FR4 Board Layout (T = 28 Mils to ground plane)
GND
C1
L1
Place inductor close to input
Length less than 100 mil
GND
INPUT
OUTPUT
All Trans. Lines Z - 75 Ohm
L2
+5 V
Note: 0.5 dB of gain slope is due to the connector and board losses.
C2
C4
C3
AH2
Multi-Channel Measurements
Parameter Frequency Value
CTB 50-550 MHz -71 dBc
CSO 50-550 MHz -48 dBc
XMOD 50-550 MHz -65 dBc
Note: 77 Channels, 50-550 MHz, +34 dBmV/channel, flat-loading
Intercept Point (dBm)
Frequency (MHz)
0
200
400
600
800
1000
Gain
Linearity vs. Frequency
S21 (dB)
Frequency (MHz)
0
200
400
600
800
1000
55
45
40
35
10
12
14
16
18
20
OIP2
OIP3
Frequency (MHz)
0
200
400
600
800
1000
0
-10
-20
-30
S12
S11
S22
Magnitude (dB)
Noise Figure
Noise Figure (dB)
Frequency (MHz)
0
200 400
600
800
1000
0
1
2
3
4
5
Output Power (dBm)
-4
-2
0
2
4
6
8
10
OIP2 and OIP3 vs. Power
55
50
45
40
35
25
30
OIP2
OIP3
Intercept Point (dBm)
Frequency = 450 MHz
-40C
+85C
Input / Output Return Loss and
Isolation
+25C
50
100
200
300 400 500
600
-50
-70
-80
dBc
Frequency (MHz)
0
CTB, CSO, and XMOD
vs. Frequency
-40
77 Channel Flat Loading, +34 dBmV Output Power
-60
CSO
XMOD
CTB
WJ Communications, Inc. Phone: 1-800-WJ1-4401 FAX: 408-577-6621 e-mail: sales@wj.com Web site: www.wj.com
October 2002
Push-Pull, 75
CATV Evaluation Circuit: 50-860 MHz
Typical Performance (75 Ohm System) Multi-Channel Measurments
Frequency MHz 50 450 750 860
S21 dB 11.1 10.8 10.6 10.5
S11 dB -10.2 -9.7 -10.8 -11.0
S22 dB -13.3 -14.1 -15.4 -16.4
OIP2 dBm 72.0 70.0 72.0 70.0
OIP3 dBm 42.0 43.0 41.0 40.0
Noise Figure dB 5.5 4.3 5.0 5.4
Bias Vdd = 5 V, Id = 300 mA
Schematic
R1
560
0603
AH2
R2
560
0603
RF IN
6 Turns bifilar
wire around
ferrite core
C4
1000 pF
0603
RF OUT
Core: TOK H5C2-T3.1-1.3-1.3
Wire: MWS B2383211
L2
470 nH
1008
DC +5 V
3 or more Via
Grounds req.
C3
1000 pF
0603
AH2
C5
1000 pF
0603
L1
470 nH
1008
6 Turns bifilar
wire around
ferrite core
or
MACOM
ETC1-1-13
surface-mount
BALUN
FR4 Board Layout (T = 28 Mils to ground Plane)
Note: 0.7 dBm of loss is due to the balun and board losses
Interior Trans. Lines Z = 37.5 Ohm
R1
R2
C2
C4
T1
C1
100pF
0603
T2
T1
C1
C3
C5
T2
AH2
AH2
C2
100 pF
0603
Parameter Frequency Value
CTB
CSO
XMOD
50-550 MHz
50-550 MHz
50-550 MHz
-72 dBc
-75 dBc
-68 dBc
Note: 77 Channels, 50-550 MHz, +34 dBmV/channel, flat-loaded
200
400
600
800
1000
70
60
40
50
30
10
20
0
Intercept Point
(dBm)
Frequency (MHz)
0
Linearity vs. Frequency
80
OIP3
OIP2
Frequency (MHz)
0
200
400
600
800
1000
S-Parameters
15
10
5
0
-5
-10
-20
-15
S21
S11
S22
Magnitude (dB)
100 200
300
400
500
600
-65
-70
-75
-80
dBc
Frequency (MHz)
0
CTB, CSO, and XMOD vs.
Frequency
-60
77 Channel Flat Loading, +34 dBmV Output Power
XMOD
CTB
CSO
AH2
WJ Communications, Inc. Phone: 1-800-WJ1-4401 FAX: 408-577-6621 e-mail: sales@wj.com Web site: www.wj.com
October 2002
AH2
Typical Test Data
S-Parameters (Vds = +5 V, Ids = 150 mA, T = 25C, unmatched device in a 75 ohm system)
Freq. (MHz)
S11 (dB)
S11 (Ang)
S21 (dB)
S21 (Ang)
S12 (dB)
S12 (Ang)
S22 (dB)
S22 (Ang)
50
-18.00
-34.61
15.49
173.26
-24.20
4.59
-24.26
-85.84
100
-17.80
-42.76
15.43
171.19
-24.14
2.04
-24.75
-86.37
150
-16.90
-48.97
15.37
168.08
-24.16
0.99
-23.99
-88.74
200
-16.00
-53.88
15.31
164.88
-24.17
0.27
-22.81
-91.71
250
-14.55
-58.61
15.22
162.05
-24.14
0.08
-22.96
-92.44
300
-12.92
-65.22
15.14
158.92
-24.17
-0.22
-23.00
-92.45
350
-12.35
-71.82
15.06
155.7
-24.07
-0.74
-22.03
-96.12
400
-11.65
-77.23
14.97
152.52
-24.10
-1.02
-21.07
-98.24
450
-11.00
-82.95
14.86
149.40
-23.99
-1.51
-20.28
-100.75
500
-10.43
-87.24
14.75
146.28
-24.03
-1.44
-19.51
-102.72
550
-9.88
-91.75
14.63
143.33
-24.00
-2.11
-18.84
-104.75
600
-9.44
-95.68
14.50
140.18
-23.96
-2.40
-18.26
-106.88
650
-9.00
-99.68
14.37
137.27
-23.91
-2.75
-17.73
-108.74
700
-8.56
-102.92
14.23
134.37
-23.94
-3.24
-17.21
-110.42
750
-8.23
-106.2
14.09
131.52
-23.90
-3.68
-16.76
-111.98
800
-7.88
-109.41
13.92
128.75
-23.90
-3.95
-16.40
-113.70
850
-7.53
-112.2
13.76
126.18
-23.84
-4.27
-16.02
-115.37
900
-7.25
-114.93
13.62
123.48
-23.83
-5.01
-15.66
-117.11
950
-6.97
-117.87
13.45
120.85
-23.83
-5.79
-15.33
-119.00
1000
-6.72
-120.3
13.29
118.27
-23.81
-5.85
-15.04
-121.09
WJ Communications, Inc. Phone: 1-800-WJ1-4401 FAX: 408-577-6621 e-mail: sales@wj.com Web site: www.wj.com
October 2002
AH2
Outline Drawing
Land Pattern
Mounting Configuration
AH2
XXXX
Alpha - Numeric Lot Code
PDF 
ZIP