Page 1
Preliminary
Preliminary
Product Description
Stanford Microdevices SCA-14 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
SCA-14
DC-4 GHz, Cascadable
GaAs HBT MMIC Amplifier
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
NGA-589 Recommended for New Designs
33.2 dBm.
These unconditionally stable amplifiers provide 20 dB of gain
and 17.7 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.
Product Features
High Output IP3: 33.2 dBm @ 850 MHz
Cascadable 50 Ohm Gain Block
Patented GaAs HBT Technology
Operates From Single Supply
Applications
Cellular, PCS, CDPD, Wireless Data, SONET
dB
Small Signal Gain vs. Frequency @ ID=65mA
25
20
15
10
5
0
0123456
Frequency GHz
Electrical Specifications
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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 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.
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
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EDS-101395 Rev A
Page 2
SCA-14 DC-4GHz Cascadable MMIC Amplifier
Absolute Maximum Ratings
Preliminary
Preliminary
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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*NOTE: While the SCA-4 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.
2
http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101395 Rev A
Page 3
Preliminary
Preliminary
SCA-14 DC-4GHz Cascadable MMIC Amplifier
dBm
250
Junction Temp vs. Dissipated Power
Device Lead Temp = +85 C
230
210
190
+175C
170
Junction Temperature (°C)
150
0.35 0.45 0.55
Pdiss (W)
Output IP3 vs. ID vs. Frequency
40
35
30
25
0.5 1.5 2.5 3.5
GHz
IP3_65mA
IP3_80mA
IP3_100mA
MTTF (hrs)
dBm
MTTF vs. Dissipated Power
1.E+07
1.E+06
1.E+05
1.E+04
1.E+03
Device Lead Temp = +85C
0.35 0.45 0.55
Pdiss (W)
Output P1dB vs. ID vs. Frequency
20
19
18
17
16
15
0.5 1.5 2.5 3.5
GHz
P1dB_65mA
P1dB_80mA
P1dB_100mA
NF vs. ID vs. Frequency
4.5
4.4
4.3
4.2
dB
4.1
4
3.9
3.8
0.5 1 1.5 2
GHz
NF_65mA
NF_80mA
NF_100mA
3
dB
Small Signal Gain vs. ID vs. Frequency
21
20
19
18
17
0.5 1.5 2.5 3.5
G_65mA
G_80mA
G_100mA
GHz
http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101395 Rev A
Page 4
SCA-14 DC-4GHz Cascadable MMIC Amplifier
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Application Schematic for Operation at 850 MHz
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Preliminary
Preliminary
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Rbias
VS
33nH
50 ohm
microstrip
2
1
3
100pF
4
100pF
Application Schematic for Operation at 1950 MHz
50 ohm
microstrip
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22pF
2
1
3
4
4
Rbias
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50 ohm
microstrip
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http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
VS
EDS-101395 Rev A
Page 5
Preliminary
Preliminary
SCA-14 DC-4GHz Cascadable MMIC Amplifier
S21, ID=65mA, T=25°C
25
20
15
dB
10
5
0
0123456
Frequency GHz
S11, ID=65mA, T=25°C
0
-5
-10
dB
-15
-20
-25
0123456
Frequency GHz
-10
-15
dB
-20
-25
-30
0123456
Frequency GHz
S22, ID=65mA, T=25°C
S12, ID=65mA, T=25°C
0
-5
dB
-10
-15
-20
0123456
Frequency GHz
S11, ID=65mA, Ta=25°C
Freq. Min = 0.05 GHz
Freq. Max = 6.0 GHz
F = 6.0 GHz
S22, I
=65mA, Ta=25°C
D
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Freq. Min = 0.05 GHz
Freq. Max = 6.0 GHz
F = 6.0 GHz
http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101395 Rev A
Page 6
Appropriate precautions in handling, packaging and
testing devices must be observed.
Preliminary
Preliminary
SCA-14 DC-4GHz Cascadable MMIC Amplifier
Part Number Ordering InformationCaution: ESD Sensitive
rebmuNtraPeziSleeRleeR/seciveD
41-ACS"70001
The part will be symbolized with a C4 designator on the
Part Symbolization
top surface of the package. Outline Drawing
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
C4
2
3
PCB Pad Layout
4
6
http://www.stanfordmicro.comPhone: (800) SMI-MMIC522 Almanor Ave., Sunnyvale, CA 94085
EDS-101395 Rev A
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