AST20S datasheet(24/33 Pages) ASB

24 / 33 page

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ASB Inc.

· sales@asb.co.kr · Tel: +82-42-528-7223

August 2012

AST20S

High Gain, Low Noise Amplifier

1) OIP3 is measured with two tones at an output power of -2 dBm/tone separated by 1MHz.

Schematic

S-parameters & K-factor

APPLICATION CIRCUIT

Board Layout (FR4, 23x13 mm

2, 0.8T)

Note: 1) the length of the strip line P1 is given as below at

the PCB with Er = 4.5 and T = 0.8 mm.

*P1 Length: 1.8 mm, Width: 0.3 mm

2) Gain and S11 are in trade-off and varied with the length of P1

Bottom

Parameter

Symbol

Unit

Frequency (MHz)

1525

1559

Power Gain

14.5

Noise Figure

0.55

Input Return Loss

RLin

-9

Output Return Loss

RLout

-14

1 dB Gain Compression

Output Power

Po(1dB)

dBm

16.5

rd Intercept Point

Output Power

OIP3

dBm

Circuit Current

Icc

Top

C1=100 pF

C2=100 pF

RF OUT

AST20S

C3=10 nF

RF IN

L2=10 nH

*P1

R1=750

C4=1 uF

*P1

VDD

R2=11 k

L1=10 nH

R3=39

1200

1300

1400

1500

1600

1700

1800

Frequency (MHz)

1200

1300

1400

1500

1600

1700

1800

-20

-15

-10

-5

Frequency (MHz)

1200

1300

1400

1500

1600

1700

1800

-20

-15

-10

-5

Frequency (MHz)

500

1000

1500

2000

2500

3000

3500

Frequency (MHz)

Satellite Phone

1525 ~ 1559 MHz

+5 V / 15 mA

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