Product Description
Stanford Microdevices' SCA-7 is a high performance Gallium
Arsenide Hetrojunction Bipolar Transistor MMIC Amplifier. A
Darlington configuration is utilized for broadband perfor-
mance up to 3 GHz. The heterojunction increases break-
down voltage and minimizes leakage current between
junctions. Cancellation of emitter junction non-linearities
results in higher suppression of intermodulation products.
Typical IP3 at 40mA is +24dBm.
These unconditionally stable amplifiers provides 21dB of gain
and +12dBm of 1dB compressed power and requires 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-7
DC-3 GHz, Cascadable
GaAs HBT MMIC Amplifier
Product Features
High Output IP3 : +24dBm
High Gain : Up to 21dB
Cascadable 50 Ohm : 1.5:1 VSWR
Patented GaAs HBT Technology
Operates From Single Supply
Low Thermal Resistance Package
Applications
Cellular, PCS, CDPD
Wireless Data, SONET
S y m b o l
P a r a m e t e r s : T e s t C o n d i t i o n s :
I d = 4 0 m A , Z
0
= 5 0 O h m s
U n i t s
M i n .
T y p .
M a x .
G
P
P o w e r G a in
f = 0 .1 - 2 .0 G H z
f = 2 .0 - 3 .0 G H z
d B
d B
1 8
2 0
1 8
G
F
G a in F la tn e s s
G a in F la tn e s s o v e r a n y 1 0 0 M H z b a n d
f = 0 .1 - 2 .0 G H z
d B
d B
+ /- 1 . 2
+ /- 0 . 1
P
1 d B
O u tp u t P o w e r a t 1 d B C o m p r e s s io n :
f = 0 .1 - 2 .0 G H z
d B m
1 2 .0
N F
N o is e F ig u r e
f = 0 .1 - 3 .0 G H z
d B
3 .8
IP
3
T h ir d O r d e r In te r c e p t P o in t
O u tp u t To n e @ 0 d B m 1 0 M H z A p a r t
f = 0 .1 - 2 .0 G H z
d B m
2 3 .0
2 4 .0
T
D
G r o u p D e la y
f = 1 .9 G H z
p s e c
1 0 0
IS O L
R e v e r s e Is o la tio n
f = 0 .1 - 3 .0 G H z
d B
2 2
V D
D e v ic e V o lta g e
V
3 .5
4 .0
4 .5
d G /d T
D e v ic e G a in Te m p e r a tu r e C o e ff ic ie n t
d B /d e g C
- 0 .0 0 3
d V /d T
D e v ic e V o lta g e Te m p e r a tu r e C o e ffic ie n t
m V /d e g C
- 4 .0
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 1999 Stanford Microdevices, Inc. All worldwide rights reserved.
522 Almanor Ave., Sunnyvale, CA 94086 Phone: (800) SMI-MMIC http://www.stanfordmicro.com
Electrical Specifications at Ta = 25C
Output IP3 vs. Frequency
20
22
24
26
28
30
0.1
1
2
3
dBm
GHz
50 Ohm Gain Blocks
5-125
|S11| vs. Frequency
|S21| vs. Frequency
|S12| vs. Frequency
|S22| vs. Frequency
Output Power vs.Frequency
Typical S-Parameters Vds = 4.0V, Id = 40mA
SCA-7 DC-3 GHz Cascadable MMIC Amplifier
(S-Parameters include the effects of two 1.0 mil diameter bond wires, each 20 mils long, connected to the gate and drain pads on the die)
522 Almanor Ave., Sunnyvale, CA 94086 Phone: (800) SMI-MMIC http://www.stanfordmicro.com
-20
-15
-10
-5
0
0.1
1
2
3
16
20
24
28
0.1
1
2
3
-30
-28
-26
-24
-22
-20
0.1
1
2
3
-20
-15
-10
-5
0
0.1
1
2
3
10
11
12
13
14
1
2
3
4
dBm
dB
GHz
GHz
dB
dB
GHz
GHz
dB
GHz
Freq GHz
|S11|
S11 Ang
|S21|
S21 Ang
|S12|
S12 Ang
|S22|
S22 Ang
.100
0.338
117
13.126
139
0.064
-19
0.326
118
.500
0.322
112
13.096
130
0.056
-25
0.317
113
.900
0.310
61
12.333
93
0.057
-46
0.320
64
1.00
0.305
47
12.165
83
0.059
-50
0.320
51
1.50
0.271
-13
11.356
38
0.062
-79
0.316
-9
2.00
0.225
-71
10.626
-7
0.066
-107
0.307
-67
2.50
0.179
-129
9.175
-52
0.070
-138
0.298
-126
3.00
0.148
172
8.363
-90
0.073
-173
0.291
177
50 Ohm Gain Blocks
Typical Performance at 25
C (Vds = 4.0V, Ids = 40mA)
5-126
SCA-7 DC-3 GHz Cascadable MMIC Amplifier
Absolute Maximum Ratings
P a r a m e t e r
A b s o lu t e
M a x im u m
D e v i c e C u r r e n t
7 5 m A
P o w e r D i s s i p a t io n
3 5 0 m W
R F In p u t P o w e r
1 0 0 m W
J u n c ti o n Te m p e r a t u r e
+ 2 0 0 C
O p e r a ti n g Te m p e r a tu r e
- 4 5 C to + 8 5 C
S to r a g e Te m p e r a tu re
- 6 5 C to + 1 5 0 C
Notes:
1. Operation of this device above any one of these
parameters may cause permanent damage.
MTTF vs. Temperature
@ Id = 40mA
Thermal Resistance (Lead-Junction): 412 C/W
522 Almanor Ave., Sunnyvale, CA 94086 Phone: (800) SMI-MMIC http://www.stanfordmicro.com
Typical Biasing Configuration
50 Ohm Gain Blocks
Lead
Temperature
MTTF (hrs)
+85C
1,000,000
+120C
100,000
+150C
10,000
Outline Drawing
Pin Designation
1
RF in
2
GND
3
RF out and Bias
4
GND
Mounting Instructions
The data shown was taken on a 31mil 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 through-holes
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
4
Recommended Bias Resistor Values
Supply Voltage (Vs)
5V
7.5V
9V
12V
15V
20V
Rbias (Ohms
)
25
88
125
200
275
400
5-127
SCA-7
PDF 
ZIP