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High Dynamic Range CATV Amplifier
AH2
The Communications Edge TM
Product Features
* 50-1000 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
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.
Functional Diagram
4
1
2
3
PIN No. Function 1 Input Ground 2 3 Output/Bias Ground 4
Specifications
Parameter Frequency Range S21 Output IP3 P1dB Operating Current Supply Voltage Max. Junction Temp. Thermal Resistance Units MHz dB dBm dBm mA V C C/W Min. 13 +37 120 Typ. 50-1000 14.5 +40 +21 150 +5 Max. Condition
Typical Parameters
Parameter Frequency S21 - Gain S21 - Gain S11 - Input Return Loss S22 - Output Return Loss Output IP3 Output IP2 P1dB Noise Figure CTB CSO Xmod
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.
Units MHz dB dB dB dB dBm dBm dBm dB dBc dBc dBc
Typical 50-1000 14.5 13.2 -14 -17 +40 +47 +20 3.5 -71 -48 -65
Condition 50 MHz 860 MHz
See Note 2 180 160 59 See Note 3
See Note 2
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.
See Note 5 See Note 5 See Note 5
Absolute Maximum Ratings
Parameter Operating Case Temperture Storage Temperature DC Voltage RF Input Power (continuous) Rating -40 to +85C -40 to +125C +6.0 V +10 dBm
Ordering Information
Part No. AH2 AH2-PCB Description High Dynamic Range CATV Amplifier (Available in tape and reel) Fully Assembled Single Ended CATV Application Circuit (75 )
Operation of this device above any of these parameters may cause permanent damage.
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
AH2
Single - Ended CATV, 75 Evaluation Circuit: 50-860 MHz (AH2 - PCB)
Typical Performance (75 Ohm System) Frequency S21 S11 S22 OIP2 OIP3 Noise Figure Bias Schematic
C1 1000 pF 0603 RF IN C2 2.2 pF 0603 L1 12 nH 0603 AH2 L2 270 nH 1008 DC +5 V 3 or moreVia Grounds req. C4 1000 pF 0603 INPUT C2 GND Place inductor close to input Length less than 100 mil
MHz 50 450 dB 14.5 14.5 dB -11.1 -12.7 dB -9.5 -22.9 dBm +46.8 +46.9 dBm +39.8 +40.7 dB 3.9 3.1 Vdd = 5 V, Id = 150 mA
750 13.7 -14.5 -12.3 +47.7 +41.0 3.2
860 13.2 -18.3 -10.6 +48.1 +40.8 3.2
Multi-Channel Measurements Parameter Frequency CTB 50-550 MHz CSO 50-550 MHz XMOD 50-550 MHz
Value -71 dBc -48 dBc -65 dBc
Note: 77 Channels, 50-550 MHz, +34 dBmV/channel, flat-loading
C3 1000 pF 0603 RF OUT
FR4 Board Layout (T = 28 Mils to ground plane)
GND All Trans. Lines Z - 75 Ohm
AH2
C1 L1 OUTPUT L2 C3
+5 V
C4
Note: 0.5 dB of gain slope is due to the connector and board losses.
Input / Output Return Loss and Isolation
0 S22 Magnitude (dB) -10 S11 -20 S12 Intercept Point (dBm) 55 50
Linearity vs. Frequency
20 OIP2 S21 (dB) 18 16 14 12 10 0 200 400 600 Frequency (MHz) 800 1000 0 200
Gain
-40C +25C +85C
45 40 OIP3
-30 0 200 400 600 Frequency (MHz) 800 1000
35
400 600 Frequency (MHz)
800
1000
OIP2 and OIP3 vs. Power
55 Intercept Point (dBm) 50 45 40 35 30 25 -4 -2 0 2 4 6 Output Power (dBm) 8 10 -80 0 100 dBc OIP3 OIP2 -50 -40
CTB, CSO, and XMOD vs. Frequency
5
Noise Figure
4 3 2 1
77 Channel Flat Loading, +34 dBmV Output Power
Noise Figure (dB) CSO
-60
XMOD
Frequency = 450 MHz
-70 CTB
0 200 300 400 Frequency (MHz) 500 600 0 200 400 600 Frequency (MHz) 800 1000
WJ Communications, Inc. * Phone: 1-800-WJ1-4401 * FAX: 408-577-6621 * e-mail: sales@wj.com * Web site: www.wj.com
February 2004
AH2
Push-Pull, 75 CATV Evaluation Circuit: 50-860 MHz
Typical Performance (75 Ohm System) Frequency S21 S11 S22 OIP2 OIP3 Noise Figure Bias Schematic FR4 Board Layout (T = 28 Mils to ground Plane)
Interior Trans. Lines Z = 37.5 Ohm T2 6 Turns bifilar wire around ferrite core RF OUT T1 R1
Multi-Channel Measurments 750 10.6 -10.8 -15.4 72.0 41.0 5.0 860 10.5 -11.0 -16.4 70.0 40.0 5.4 Parameter CTB CSO XMOD Frequency 50-550 MHz 50-550 MHz 50-550 MHz Value -72 dBc -75 dBc -68 dBc
MHz 50 450 dB 11.1 10.8 dB -10.2 -9.7 dB -13.3 -14.1 dBm 72.0 70.0 dBm 42.0 43.0 dB 5.5 4.3 Vdd = 5 V, Id = 300 mA
Note: 77 Channels, 50-550 MHz, +34 dBmV/channel, flat-loaded
R1 560 0603
C1 100pF 0603 AH2
C4 1000 pF 0603 L1 470 nH 1008 DC +5 V L2 470 nH 1008 C5 1000 pF 0603
AH2
C1 C3
C4
T1 6 Turns bifilar RF IN wire around ferrite core
C3 1000 pF 0603 R2 560 0603 C2 100 pF 0603
AH2
or MACOM ETC1-1-13 surface-mount BALUN
AH2
R2 C2
C5
T2
Note: 0.7 dBm of loss is due to the balun and board losses
3 or more Via Grounds req.
Core: TOK H5C2-T3.1-1.3-1.3 Wire: MWS B2383211
S-Parameters
15 S21 Intercept Point (dBm) 10 Magnitude (dB) 5 0 -5 -10 S11 80 70 60 50
Linearity vs. Frequency
-60 OIP2
CTB, CSO, and XMOD vs. Frequency
77 Channel Flat Loading, +34 dBmV Output Power
-65 XMOD dBc -70 CTB
40 30 20 10 0
OIP3
-75
-15 -20 0 200
CSO
S22 400 600 Frequency (MHz) 800 1000
-80 0 200 400 600 Frequency (MHz) 800 1000 0 100 200 300 400 Frequency (MHz) 500 600
WJ Communications, Inc. * Phone: 1-800-WJ1-4401 * FAX: 408-577-6621 * e-mail: sales@wj.com * Web site: www.wj.com
February 2004
AH2
Typical Test Data
S-Parameters (Vds = +5 V, Ids = 150 mA, T = 25C, unmatched device in a 75 ohm system) Freq. (MHz) 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800 850 900 950 1000 S11 (dB) -18.00 -17.80 -16.90 -16.00 -14.55 -12.92 -12.35 -11.65 -11.00 -10.43 -9.88 -9.44 -9.00 -8.56 -8.23 -7.88 -7.53 -7.25 -6.97 -6.72 S11 (Ang) -34.61 -42.76 -48.97 -53.88 -58.61 -65.22 -71.82 -77.23 -82.95 -87.24 -91.75 -95.68 -99.68 -102.92 -106.2 -109.41 -112.2 -114.93 -117.87 -120.3 S21 (dB) 15.49 15.43 15.37 15.31 15.22 15.14 15.06 14.97 14.86 14.75 14.63 14.50 14.37 14.23 14.09 13.92 13.76 13.62 13.45 13.29 S21 (Ang) 173.26 171.19 168.08 164.88 162.05 158.92 155.7 152.52 149.40 146.28 143.33 140.18 137.27 134.37 131.52 128.75 126.18 123.48 120.85 118.27 S12 (dB) -24.20 -24.14 -24.16 -24.17 -24.14 -24.17 -24.07 -24.10 -23.99 -24.03 -24.00 -23.96 -23.91 -23.94 -23.90 -23.90 -23.84 -23.83 -23.83 -23.81 S12 (Ang) 4.59 2.04 0.99 0.27 0.08 -0.22 -0.74 -1.02 -1.51 -1.44 -2.11 -2.40 -2.75 -3.24 -3.68 -3.95 -4.27 -5.01 -5.79 -5.85 S22 (dB) -24.26 -24.75 -23.99 -22.81 -22.96 -23.00 -22.03 -21.07 -20.28 -19.51 -18.84 -18.26 -17.73 -17.21 -16.76 -16.40 -16.02 -15.66 -15.33 -15.04 S22 (Ang) -85.84 -86.37 -88.74 -91.71 -92.44 -92.45 -96.12 -98.24 -100.75 -102.72 -104.75 -106.88 -108.74 -110.42 -111.98 -113.70 -115.37 -117.11 -119.00 -121.09
WJ Communications, Inc. * Phone: 1-800-WJ1-4401 * FAX: 408-577-6621 * e-mail: sales@wj.com * Web site: www.wj.com
February 2004
AH2
Outline Drawing
AH2 XXXX
Alpha - Numeric Lot Code
Land Pattern
Mounting Configuration
WJ Communications, Inc. * Phone: 1-800-WJ1-4401 * FAX: 408-577-6621 * e-mail: sales@wj.com * Web site: www.wj.com
February 2004

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