SXA-289 查看數據表（PDF） - Stanford Microdevices
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SXA-289 Datasheet PDF : 6 Pages
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850 MHz Application Circuit
SXA-289 5-2000 MHz Power Amplifier
Voltage Feed Resistor Bias Circuit (for > 7V supply)
390 Ω
180 Ω
0.1 µF
(SIZE A)
68pF
Vs
Rbias
1000pF
33 nH
33 nH
100 pF
100 pF
Z=50Ω, 12.9°
5.6 pF
SXA-289
850 MHz Schematic
Recommended Bias Resistor Values
Supply Voltage(Vs) 7V 8V 10V 12V
Rbias (Ohms)
18
27
47
62
Power Rating
0.5W 1.0W 1.5W 2.0W
RFin
Rbias
390 Ohms
180 Ohms
100pF
33nH
0.1uF
1000pF
68 pF
RFout
33nH
100pF
5.6pF
SXA-289
STANFORD MICRODEVICES
SOT-89 Eval Board
ECB-101499 Rev A
850 MHz Evaluation Board Layout
Active Current Feedback Bias Circuit (for 5V supply)
0.1 µF
(SIZE A)
Vs = 5V
68 pF
220 Ω
6
(Rohm)
2 UMZ1N
15
1000 pF
4
1.8 KΩ
3
750Ω
100 pF
Z=50Ω, 12.9°
5.6 pF
Rbias=4.3 Ω
Vdev
33 nH
100 pF
SXA-289
850 MHz Schematic
Frequency
850 M Hz
Small Signal Gain (dB)
20.0
Input Return Loss (dB)
-22.8
Output IP3 (dBm)
37.7*
P1dB (dBm)
23.0
*Note: IP3 performance degraded due to lower
(4.5V) device voltage.
UMZ1N
RF IN
0.1 uF
68pF
VCC
220Ω
1000pF
1.8KΩ
1
4.3Ω
33nH
100pF
750Ω
5.6pF
GND
RF OUT
100pF
NOTE: Reference Application Note AN-026 for more
information on Active Current Feedback Bias Circuit.
ALL COMPONENTS 0603 UNLESS NOTED OTHERWISE
STANFORD MICRODEVICES
XAMP EVALUATION BOARD
ECB-101872 Rev A SOT-89
850 MHz Active Bias Evaluation Board Layout
522 Almanor Ave., Sunnyvale, CA 94085
Phone: (800) SMI-MMIC
4
http://www.stanfordmicro.com
EDS-100622 Rev E
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