3/8

ASB Inc.

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

July 2010

AST163

High Gain, Low Noise Amplifier

1) OIP3 is measured with two tones at an output power of -5 dBm/tone

separated by 1MHz.

2) It is the test result when the R1 value is 1.1 kohm. A user can easily increase

an operating current by choosing R1 value.

Top

Schematic

S-parameters & Noise Figure

Board Layout (FR4, 15.3x12 mm

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: 3.5 mm, Width: 0.3 mm

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

1400

1450

1500

1550

1600

1650

1700

1750

1800

0

5

10

15

20

Frequency (MHz)

-40

25

85

1400

1450

1500

1550

1600

1650

1700

1750

1800

-20

-15

-10

-5

0

5

Frequency (MHz)

-40

25

85

1400

1450

1500

1550

1600

1650

1700

1750

1800

-25

-20

-15

-10

-5

0

Frequency (MHz)

-40

25

85

0

500

1000

1500

2000

2500

3000

3500

0

1

2

3

4

5

Frequency (MHz)

Frequency (MHz)

1575

1575

2)

Magnitude S21 (dB)

13.5

14

Magnitude S11 (dB)

-10

-12

Magnitude S22 (dB)

-10

-14

Output P1dB (dBm)

10

10

Output IP3

16

18

Noise Figure (dB)

1.1

0.95

Supply Voltage (V)

3

3

Current (mA)

3.7

6.0

APPLICATION CIRCUIT

GPS

1575 MHz

+3 V

C1=100 pF

C2=1.2 pF RF OUT

AST163

C3=10 nF

RF IN

L2=6.8 nH

R3=51

W

*P1

R1=1 k

W

C4=1 uF

*P1

VDD

R2=9.1 k

W

L1=6.2 nH

Bottom