AST163
High Gain, Low Noise Amplifier
Frequency (MHz)
1575
15.5
-10
-11
10
24
0.9
2.8
9.5
APPLICATION CIRCUIT
GPS
1575 MHz
+2.8 V
Magnitude S21 (dB)
Magnitude S11 (dB)
Magnitude S22 (dB)
Output P1dB (dBm)
Output IP3 (dBm)
Noise Figure (dB)
Supply Voltage (V)
Current (mA)
1)
1) OIP3 is measured with two tones at an output power of -5 dBm/tone
separated by 1MHz.
Schematic
VDD
Board Layout (FR4, 15.3x12 mm
2
, 0.8T)
Top
C3=10 nF
R1=910
W
C4=1 uF
R2=6.2 kW
*P1
AST163
*P1
R3=30
W
L1=6.2 nH
RF IN
C1=100 pF
L2=6.8 nH
C2=1.2 pF
RF OUT
Bottom
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: 3.4 mm, Width: 0.3 mm
2) Gain and S11 are in trade-off and varied with the length of P1
S-parameters & Noise Figure
25
0
20
-5
Gain (dB)
15
S11 (dB)
1450
1500
1550
1600
1650
1700
1750
1800
-10
10
-15
5
0
1400
-20
1400
1450
1500
1550
1600
1650
1700
1750
1800
Frequency (MHz)
0
5
Frequency (MHz)
-5
4
-10
Stability Factor
1450
1500
1550
1600
1650
1700
1750
1800
3
S22 (dB)
-15
2
-20
1
-25
1400
0
0
500
1000
1500
2000
2500
3000
3500
Frequency (MHz)
Frequency (MHz)
5/8
ASB Inc.
·
sales@asb.co.kr
·
Tel: +82-42-528-7223
July 2010
ASB [ ADVANCED SEMICONDUCTOR BUSINESS INC. ]
