AST163 Datasheet, PDF (3/8 Pages) Advanced Semiconductor Business Inc. – High Gain, Low Noise Amplifier

APPLICATION CIRCUIT
GPS
1575 MHz
+3 V
Schematic
VDD
AST163
High Gain, Low Noise Amplifier
Frequency (MHz)
1575
1575²⁾
Magnitude S21 (dB)
13.5
14
Magnitude S11 (dB)
-10
-12
Magnitude S22 (dB)
-10
-14
Output P1dB (dBm)
10
10
Output IP3¹⁾ (dBm)
16
18
Noise Figure (dB)
1.1
0.95
Supply Voltage (V)
3
3
Current (mA)
3.7
6.0
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.
Board Layout (FR4, 15.3x12 mm², 0.8T)
Top
C3=10 nF
R1=1 kW
RF IN ^{C1=100 pF}
R2=9.1 kW
L1=6.2 nH
*P1
AST163
*P1
R3=51 W
C4=1 uF
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: 3.5 mm, Width: 0.3 mm
2) Gain and S11 are in trade-off and varied with the length of P1
S-parameters & Noise Figure
20
5
0
o
15
-40 c
o
25 c
o
85 c
-5
10
-10
o
-40 c
o
5
25 c
o
85 c
-15
0
1400
0
1450
1500
1550 1600 1650
Frequency (MHz)
1700
1750
1800
-20
1400
5
1450
1500
1550 1600 1650
Frequency (MHz)
1700
1750
1800
-5
4
-10
3
-15
o
2
-40 c
o
25 c
o
85 c
-20
1
-25
1400
1450
1500
1550 1600 1650
Frequency (MHz)
1700
1750
1800
0
0
500
1000
1500
2000
2500
3000
3500
Frequency (MHz)
3/8
ASB Inc. · [e-mail] · Tel: [phone]
July 2010