WJ Company AH2-PCB, AH2 Datasheet

WJ Communications, Inc. • Phone: 1-800-WJ1-4401 • FAX:[phone] • e-mail:[e-mail] • Web site: www.wj.com February 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 requires minimal off chip biasing
elements. The device is manufactured using
GaAs MESFET technology and boasts an
MTBF of >100 years

3

at a mounting tempera­ture of 85°C. All devices are 100% RF and DC
tested.

Product Features

•

50-860 MHz

•

-75 dBc CTB, 83 Channels

•

-53 dBc CSO, 83 Channels

•

3.5 dB Noise Figure

•

14.5 dB Gain

•

+

20 dBm P1dB

•

MTBF >100 Years

•

Single +5 V Supply

Functional Diagram

Absolute Maximum Ratings

Parameter Rating

Operating Case Temperture -40 to +85°C
Storage Temperature -55 to +125°C
Supply Voltage +6.0 V
Input RF 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

High Dynamic Range CATV Amplifier

The Communications Edge

™

Specifications

Parameter Units Minimum Typical Maximum Condition

Frequency Range MHz 50-860
Supply Voltage V 5
Operating Current Range mA 120 150 180 Vdd = 5.0 V

Packaged Device into 75 Ohms

S21 - Gain dB 14.5

50 MHz

S21 - Gain dB 13.0 14.0

860 MHz
Output IP3 dBm 36 40
Output P1dB dBm 21
Noise Figure dB 3.5

Single Ended CATV Evaluation

Circuit

Current mA 150
S21 - Gain dB 14.5 50 MHz
S21 - Gain dB 13.7 860 MHz
S11 - Input Return Loss dB -12.0 Average Across Band
S22 - Output Return Loss dB -15.0 Average Across Band
Output IP3 dBm 40
Output IP2 dBm 47
Output P1dB dBm 20 68.7 dBmV
Noise Figure dB 3.5
CSO dBc -53 83 channels, 30 dBmV/ch, single
CTB dBc -75 83 channels, 30 dBmV/ch, single

1.Test conditions unless otherwise noted.T = 25˚C, Vdd = 5.0 V.

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 OIP3 using a 2:1 slope rule.

3. MTBF calculated with channel temperature at 155˚C.

Actual Size

4

123

Function Pin No.

Input 1

Ground 2

Output/Bias 3

Ground 4

WJ Communications, Inc. • Phone: 1-800-WJ1-4401 • FAX:[phone] • e-mail: [e-mail] • Web site: www.wj.com February 2002

AH2

Single Ended CATV Evaluation Circuit: 50-860 MHz

Performance Charts

(Single Ended CATV Evaluation Circuit)

Typical Performance (75 Ohm System)

Frequency 50 MHz 450 MHz 750 MHz 860 MHz
Magnitude S21 14.5 dB 14.4 dB 14.0 dB 13.7 dB
Magnitude S11 -10.0 dB -11.2 dB -12.8 dB -16.9 dB
Magnitude S22 -8.8 dB -20.0 dB -11.6 dB -9.8 dB
OIP2 46.8 dBm 46.9 dBm 47.7 dBm 48.1 dBm
OIP3 39.8 dBm 40.7 dBm 41.0 dBm 40.8 dBm
Noise Figure 4.3 dB 3.4 dB 3.5 dB 3.6 dB
Bias Vds = 5 V, Id = 150 mA

Schematic

Optional

C = 1000pF

RF IN

C = 2.2 pF

L = 18 nH

AH2

3 or more Via
Grounds req.

L = 270 nH

C = 1000 pF

C = 1000 pF

Multi-channel Measurements

CSO -53 dBc 550 MHz 83 channels +30 dBmV/ch, Flat
CTB -75 dBc 550 MHz 83 channels +30 dBmV/ch, Flat
XMOD -70 dBc 550 MHz 83 channels +30 dBmV/ch, Flat

FR4 Board Layout (T = 28 Mils to ground plane)

RF OUT

0603 Package

C = 1000 pF

DC +5 V

0603 Package

C = 2.2 pF

Note: 0.5 dB of gain slope is due to the connector and board losses.

0603 Package

L = 18.0 nH

INPUT

Place inductor close to input

Length less than 100 mil

GND

GND

OUTPUT

1008 Package

L = 270 nH

Coilcraft

All Trans. Lines Z = 75 Ohm

0603 Package

C = 1000 pF

0603 Package

C = 1000 pF

+5 V

S-Parameters

20
10

0

-10

-20

Magnitude (dB)

-30

-40

0 10050200 300 400 500 600 700 800 900 1000

S21

S11

S22

Frequency (MHz)

OIP2 and OIP3 vs. Power

55
50

45

40

35

Intercept Point (dBm)

30
25

OIP2

OIP3

Frequency = 450 MHz

-4 -2 0 2 4 6 8 10
Output Power (dBm)

Noise Figure and Gain vs. Frequency Linearity vs. Frequency

60

50
40

30

20

Intercept Point (dBm)

10

00

0 100 200 300 400 500 600 700 800 900 1000

Frequency (MHz)

OIP2

OIP3

20

16

12

8

4

Noise Figure and Gain (dB)

0 10050200 300 400 500 600 700 800 900 1000

Frequency (MHz)

S21 (dB)

Noise Figure

Gain vs. Temperature Gain vs. Power Out

14
13
12

11
10

Gain (dB)

9

Frequency = 450 MHz

8
7

0 5 10 15 20 25

Output Power (dBm)

14.5

14.0

13.5

Gain (dB)

13.0

Frequency = 450 MHz

12.5

12.0

-40 -20 0 20 40 60 80
Temperature (°C)