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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 user s 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.
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101390 Rev A
Preliminary
Preliminary
Product Description
0
5
10
15
0123456
Stanford Microdevices SCA-2 is a high performance Gallium
Arsenide Heterojunction Bipolar Transistor MMIC Amplifier. A
Darlington configuration is utilized for broadband performance
up to 4 GHz. 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 34.7 dBm.
These unconditionally stable amplifiers provide 11 dB of gain
and 18 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 applications such as cellular, PCS, CDPD, wireless data and SONET.
SCA-2
DC-4 GHz, Cascadable
GaAs HBT MMIC Amplifier
NGA-689 Recommended for New Designs
Product Features
High Output IP3: 35 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
GHz
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zHM058=f
zHM0591=f
zHM0042=f
mBd
mBd
mBd
2.81
3.71
1.71
PI
3
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mBd
mBd
5.237.43
1.13
7.92
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zHM058=f
zHM0591=f
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Bd
Bd
Bd
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zHM058=f
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Bd
Bd
Bd
4.61
6.61
6.61
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dB
Small Signal Gain vs. Frequency @ ID=65mA
Frequency GHz
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
Preliminary
EDS-101390 Rev A
SCA-2 DC-4GHz Cascadable MMIC Amplifier
Preliminary
Absolute Maximum Ratings
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egnaRerutarepmeTegarotS051+ot04-C
erutarepmeTnoitcnuJgnitarepO571+C
Operation of this device above any one of these parameters
may cause permanent damage.
Bias Conditions should also satisfy the following expression:
IDVD (max) < (TJ - TOP)/Rth, j-l
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ssoLnruteRtupnI
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2.11
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2.53
2.81
9.81
3.61
Bd
Bd
mBd
mBd
Bd
Bd
Z
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smhO05=
mBd0=enotreptuoP,zHM1=gnicapsenoT
zHM058
niaG
erugiFesioN
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Bd1PtuptuO
ssoLnruteRtupnI
noitalosI
2.11
4.7
7.43
2.81
1.71
4.61
Bd
Bd
mBd
mBd
Bd
Bd
Z
S
smhO05=
mBd0=enotreptuoP,zHM1=gnicapsenoT
zHM0591
niaG
erugiFesioN
3PItuptuO
Bd1PtuptuO
ssoLnruteRtupnI
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5.11
4.7
1.13
3.71
5.41
6.61
Bd
Bd
mBd
mBd
Bd
Bd
Z
S
smhO05=
mBd0=enotreptuoP,zHM1=gnicapsenoT
zHM0042
niaG
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7.11
7.92
1.71
2.41
6.61
Bd
mBd
mBd
Bd
Bd
mBd0=enotreptuoP,zHM1=gnicapsenoT
*NOTE: While the SCA-2 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 85°C ambient
temperature.
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101390 Rev A
Preliminary
SCA-2 DC-4GHz Cascadable MMIC Amplifier
Preliminary
100
120
140
160
180
200
220
240
0.2 0.3 0.4 0.5 0.6 0.7
85C lead temp
25
30
35
40
0.5 1.5 2.5 3.5
65mA
80mA
100mA
13
15
17
19
21
0.5 1.5 2.5 3.5
65mA
80mA
100mA
Output IP3 vs. ID vs. Frequency
GHz GHz
Output P1dB vs. ID vs. Frequency
dBm
7
7.5
8
8.5
0.5 1 1.5 2
65mA
80mA
100mA
11
11.5
12
12.5
0.51.52.53.5
65mA
80mA
100mA
GHz
GHz
dB
dB
NF vs. ID vs. Frequency Small Signal Gain vs. ID vs. Frequency
dBm
1.E+03
1.E+04
1.E+05
1.E+06
1.E+07
1.E+08
1.E+09
0.2 0.3 0.4 0.5 0.6 0.
7
85C lead temp
Junction Temp vs. Dissipated Power MTTF vs. Dissipated Power
Pdiss (W)
Pdiss (W)
MTTF (hrs)
Junction Temperature (°C)
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
Preliminary
EDS-101390 Rev A
SCA-2 DC-4GHz Cascadable MMIC Amplifier
Preliminary
#niPnoitcnuFnoitpircseD
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Rbias
68pF
22nH
1uF
22pF
68pF
50 ohm
microstrip
50 ohm
microstrip
VS
Application Schematic for Operation at 850 MHz
Application Schematic for Operation at 1950 MHz
Rbias
100pF
33nH
1uF
68pF
100pF
50 ohm
microstrip
50 ohm
microstrip
VS
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101390 Rev A
Preliminary
SCA-2 DC-4GHz Cascadable MMIC Amplifier
Preliminary
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-16
-14
-12
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-20
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-10
-5
0
0123456
-30
-20
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0123456
S21, ID=65mA, T=25°C
dB
Frequency GHz
dB
dB
dB
Frequency GHz
S12, I
D
=65mA, T=25°C
S22, I
D
=65mA, T=25°C
Frequency GHz
Frequency GHz
S11, ID=65mA, T=25°C
S11, ID=65mA, Ta=25°C
S22, I
D
=65mA, Ta=25°C
Freq. Min = 0.05 GHz
Freq. Max = 6.0 GHz
Freq. Min = 0.05 GHz
Freq. Max = 6.0 GHz
F = 6.0 GHz
F = 6.0 GHz
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
Preliminary
EDS-101390 Rev A
SCA-2 DC-4GHz Cascadable MMIC Amplifier
Preliminary
Mounting Instructions
The data shown was taken on a 31 mil thick FR-4 board with
1 ounce of copper on both sides.
The board was mounted to a baseplate with 3 screws as
shown. The screws bring the top side copper temperature to
the same value as the baseplate.
1. Use 1 or 2 ounce copper, if possible.
2. Solder the copper pad on the backside of the device
package to the ground plane.
3. Use a large ground pad area with many plated throughholes as shown.
4. If possible, use at least one screw no more than 0.2 inch
from the device package to provide a low thermal resistance
path to the baseplate of the package.
5. Thermal resistance from ground lead to screws is
2 deg. C/W.
1
2
3
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rebmuNtraPeziSleeRleeR/seciveD
2-ACS"70001
Part Number Ordering InformationCaution: ESD Sensitive
Appropriate precautions in handling, packaging and
testing devices must be observed.
PCB Pad Layout
Part Symbolization
The part will be symbolized with a C2 designator on
the top surface of the package. Outline Drawing
C2
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