Product Description
Stanford Microdevices' SNA-476 is a GaAs monolithic
broadband amplifier (MMIC) housed in a low-cost surface
mountable stripline ceramic package. This amplifier
provides 13dB of gain when biased at 70mA and 5.0V.
External DC decoupling capacitors determine low
frequency response. The use of an external resistor
allows for bias flexibility and stability.
These unconditionally stable amplifiers are designed for
use as general purpose 50 ohm gain blocks. Also available
in chip form (SNA-400), its small size (0.4mm x 0.4mm) and
gold metallization, make it an ideal choice for use in hybrid
circuits.
The SNA-476 is available in tape and reel at 1000, 3000 and
5000 devices per reel.
SNA-476
DC-8 GHz, Cascadable
GaAs MMIC Amplifier
Product Features
Cascadable 50 Ohm Gain Block
13dB Gain, +17dBm P1dB
1.5:1 Input and Output VSWR
Operates From Single Supply
Low Cost Stripline Mount Ceramic Package
Hermetically Sealed
Applications
Narrow and Broadband Linear Amplifiers
Commercial and Industrial Applications
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 = 7 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
S m a l l S i g n a l P o w e r G a in
f = 0 . 1 - 2 . 0 G H z
f = 2 . 0 - 6 . 0 G H z
f = 6 . 0 - 8 . 0 G H z
d B
d B
d B
1 1 . 0
1 0 . 0
9 . 0
1 3 . 0
1 2 . 0
1 1 . 0
G
F
G a i n F l a t n e s s
f = 0 . 1 - 6 . 0 G H z
d B
+ / - 1 . 0
B W 3 d B
3 d B B a n d w i d t h
G H z
8 . 0
P
1 d B
O u t p u t P o w e r a t 1 d B C o m p r e s s i o n
f = 2 . 0 G H z
d B m
1 7 . 0
N F
N o i s e F i g u r e
f = 2 . 0 G H z
d B
5 . 5
6 . 0
V S W R
I n p u t / O u t p u t
f = 0 . 1 - 8 . 0 G H z
1 . 5 : 1
I P
3
T h i r d O r d e r I n t e r c e p t P o i n t
f = 2 . 0 G H z
d B m
3 4 . 0
T
D
G r o u p D e la y
f = 2 . 0 G H z
p s e c
1 2 0
I S O L
R e v e r s e I s o la t i o n
f = 0 . 1 - 8 . 0 G H z
d B
1 8 . 0
V D
D e v i c e V o l t a g e
V
4 . 3
5 . 0
5 . 7
d G / d T
D e v i c e G a i n T e m p e r a t u r e C o e f f i c i e n t
d B / d e g C
- 0 . 0 0 2 7
d V / d T
D e v i c e V o l t a g e T e m p e r a t u r e C o e f f i c i e n t
m V / d e g C
- 5 . 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
50 Ohm Gain Blocks
Output Power vs. Frequency
14
16
18
20
22
0.1
0.5
1
1.5
2
4
6
8
10
GHz
dBm
5-57
Typical S-Parameters Vds = 5.0V, Id = 70mA
SNA-476 DC-8 GHz Cascadable MMIC Amplifier
Freq GHz
|S11|
S11 Ang
|S21|
S21 Ang
|S12|
S12 Ang
|S22|
S22 Ang
.100
0.205
148
5.268
176
0.112
0
0.141
160
.250
0.233
136
5.124
166
0.111
9
0.157
150
.500
0.282
120
4.891
139
0.119
-29
0.185
121
1.00
0.295
64
4.793
101
0.118
-55
0.207
68
1.50
0.302
6
4.746
60
0.117
-87
0.227
13
2.00
0.290
-46
4.774
21
0.117
-113
0.231
-37
4.00
0.150
74
3.740
57
0.104
7
0.222
-90
6.00
0.164
-52
3.331
61
0.151
-2
0.130
1
8.00
0.275
161
2.973
-109
0.100
-115
0.190
147
(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
Typical Performance at 25
C (Vds = 5.0V, Ids = 70mA)
50 Ohm Gain Blocks
Noise Figure vs. Frequency
4
5
6
7
0.1
2.0
4.0
6.0
8.0
|S11| vs. Frequency
|S21| vs. Frequency
|S12| vs. Frequency
|S22| vs. Frequency
TOIP vs. Frequency
-25
-20
-15
-10
-5
0
0.1
0.5
1
1.5
2
4
6
8
10
8
10
12
14
16
0.1
0.5
1
1.5
2
4
6
8
10
-25
-20
-15
-10
-5
0
0.1
0.5
1
1.5
2
4
6
8
10
-25
-20
-15
-10
-5
0
0.1
0.5
1
1.5
2
4
6
8
10
28
30
32
34
36
38
0.1
0.5
1
1.5
2
4
6
8
10
GHz
dB
GHz
dB
GHz
dBm
GHz
dB
GHz
dB
GHz
dB
5-58
SNA-476 DC-8 GHz Cascadable MMIC Amplifier
Typical Performance at 25 C
Part Number
Devices Per Reel
Reel Size
SNA-476-TR1
1000
7"
SNA-476-TR2
3000
13"
SNA-476-TR3
5000
13"
Part Number Ordering Information
Notes:
1. Operation of this device above any one of these
parameters may cause permanent damage.
Thermal Resistance (Lead-Junction): 315 C/W
522 Almanor Ave., Sunnyvale, CA 94086 Phone: (800) SMI-MMIC http://www.stanfordmicro.com
Typical Biasing Configuration
Absolute Maximum Ratings
MTTF vs. Temperature @ Id = 70mA
P a r a m e te r
A b s o lu te
M a x im u m
D e vic e C ur re nt
1 0 0m A
P o w e r D issipa tion
5 6 0m W
R F In p ut P o w er
2 0 0m W
Ju n ction Te m p e ra ture
+2 0 0 C
O p e ra tin g Te m p e ra tu re
-4 5 C to +8 5 C
S to ra g e Te m pe ra tu re
-6 5 C to +1 5 0 C
Lead Temperature
Junction
Temperature
MTTF (hrs)
+45C
+155C
1000000
+80C
+190C
100000
+110C
+220C
10000
Device Voltage vs. Id
3.5
4
4.5
5
5.5
45
50
60
65
70
75
80
Power Gain vs. Device Current
9
10
11
12
13
14
2
4
6
8
90mA
80mA
70mA
60mA
50mA
dB
Vdc
mA
GHz
50 Ohm Gain Blocks
Pin Designation
1
RF in
2
GND
3
RF out and
Bias
4
GND
6.0
5.0
R e c o m m e n d e d B ia s R e s is to r Va lu e s
Su p p ly
Vo lta g e (V s )
5 V
7 .5 V
9 V
1 2 V
1 5 V
2 0 V
R b ia s (O h m s )
*
3 6
5 7
1 0 0
1 4 3
2 1 4
* Needs active biasing for constant current source
5-59
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