The information provided herein is believed to be reliable at press time. Stanford Microdevices assumes no responsibility for inaccuracies or omissions.
Stanford Microdevices assumes no responsibility for the use of this information, and all such information shall be entirely at the users own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. Stanford Microdevices does not authorize or warrant any Stanford
Microdevices product for use in life-support devices and/or systems.
Copyright 2000 Stanford Microdevices, Inc. All worldwide rights reserved.
1
http://www.stanfordmicro.com
Phone: (800) SMI-MMIC
522 Almanor Ave., Sunnyvale, CA 94085
EDS-101392 Rev A
Preliminary
Preliminary
Product Description
10
11
12
13
14
15
16
0
1
2
3
4
5
6
Stanford Microdevices SCA-3 is a high performance Gallium
Arsenide Heterojunction Bipolar Transistor MMIC Amplifier. A
Darlington configuration is utilized for broadband performance
up to 5GHz. The heterojunction increases breakdown voltage
and minimizes leakage current between junctions. Cancellation
of emitter junction non-linearities results in higher suppression of
intermodulation products. Typical IP3 at 850 MHz with 65mA is
32.8 dBm.
These unconditionally stable amplifiers provide 13.7 dB of gain
and 17.3 dBm of 1dB compressed power and require only a
single positive voltage supply. Only 2 DC-blocking capacitors,
a bias resistor and an optional inductor are needed for
operation. This MMIC is an ideal choice for wireless applica-
tions such as cellular, PCS, CDPD, wireless data and SONET.
SCA-3
DC-5 GHz, Cascadable
GaAs HBT MMIC Amplifier
NGA-489 Recommended for New Designs
Product Features
High Output IP3: 32.8 dBm @ 850 MHz
Cascadable 50 Ohm Gain Block
Patented GaAs HBT Technology
Operates From Single Supply
Applications
Cellular, PCS, CDPD, Wireless Data, SONET
Electrical Specifications
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Frequency (GHz)
2
http://www.stanfordmicro.com
Phone: (800) SMI-MMIC
522 Almanor Ave., Sunnyvale, CA 94085
Preliminary
EDS-101392 Rev A
SCA-3 DC-5GHz Cascadable MMIC Amplifier
Preliminary
Absolute Maximum Ratings
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Operation of this device above any one of these parameters
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Bias Conditions should also satisfy the following expression:
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(max) < (T
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*NOTE: While the SCA-3 can be operated at different bias currents, 65 mA is the recommended
bias for lower junction temperature and longer life. This reflects typical operating conditions
which we have found to be an optimal balance between high IP3 and MTTF. In general, MTTF
is improved to more than 100,000 hours when biasing at 65 mA and operating up to 85C ambient
temperature.
3
http://www.stanfordmicro.com
Phone: (800) SMI-MMIC
522 Almanor Ave., Sunnyvale, CA 94085
EDS-101392 Rev A
Preliminary
SCA-3 DC-5GHz Cascadable MMIC Amplifier
Preliminary
5
5 .5
6
6 .5
0.5
1
1 .5
2
N F_ 65 m A
N F_ 80 m A
NF _100mA
12
13
14
15
0.5
1.5
2.5
3.5
G_65mA
G_80mA
G_100mA
25
30
35
40
0.5
1.5
2.5
3.5
IP3_65mA
IP3_80mA
IP3_100mA
15
16
17
18
19
20
0.5
1.5
2.5
3.5
P1dB_65mA
P1dB_80mA
P1dB_100mA
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
0.35
0.45
0.55
Device Lead Temp = +85C
150
170
190
210
230
250
0.35
0.45
0.55
Device Lead Temp = +85 C
+175C
Output IP3 vs. I
D
vs. Frequency
GHz
GHz
Output P1dB vs. I
D
vs. Frequency
dBm
GHz
GHz
dB
dB
NF vs. I
D
vs. Frequency
Small Signal Gain vs. I
D
vs. Frequency
dBm
Junction Temp vs. Dissipated Power
MTTF vs. Dissipated Power
Pdiss (W)
Pdiss (W)
MTTF
(hrs)
Junction
T
e
mperature
(C)
4
http://www.stanfordmicro.com
Phone: (800) SMI-MMIC
522 Almanor Ave., Sunnyvale, CA 94085
Preliminary
EDS-101392 Rev A
SCA-3 DC-5GHz Cascadable MMIC Amplifier
Preliminary
#
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Application Schematic for Operation at 850 MHz
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Rbias
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