Page 1
Product Description
Stanford Microdevices SGA-6486 is a high performance SiGe
Heterojunction Bipolar Transistor MMIC Amplifier. A Darlington
configuration featuring 1 micron emitters provides high FT and
excellent thermal perfomance. The heterojunction increases
breakdown voltage and minimizes leakage current between
junctions. Cancellation of emitter junction non-linearities results
in higher suppression of intermodulation products. At 850 Mhz
and 80mA , the SGA-6486 typically provides +35 dBm output
IP3, 19.7 dB of gain, and +21 dBm of 1dB compressed power
using a single positive voltage supply. Only 2 DC-blocking
capacitors, a bias resistor and an optional RF choke are required
for operation.
Gain & Return Lo ss vs. Fr eq. @TL=+25°C
24
18
12
Gain (dB)
6
0
012345
GAIN
ORL
IRL
Frequency (GHz)
0
-8
-16
-24
-32
-40
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SGA-6486
DC-4500 MHz, Cascadable
SiGe HBT MMIC Amplifier
Product Features
High Gain : 16.1 dB at 1950 MHz
Cascadable 50 Ohm
Patented SiGe Technology
Operates From Single Supply
Low Thermal Resistance Package
Applications
Return Loss (dB)
Cellular, PCS, CDPD
Wireless Data, SONET
Satellite
Bd
Bd
Bd
mBd
mBd
mBd
mBd
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0.22
1.61
8.41
0.12
5.81
0.53
5.23
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Test Conditions:
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 right s 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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VS = 8 V ID = 75 mA Typ. OIP3 Tone Spacing = 1 MHz, Pout per tone = 0 dBm
R
= 39 Ohms TL = 25ºC ZS = ZL = 50 Ohms
BIAS
Phone: (800) SMI-MMIC http://www.stanfordmicro.com726 Palomar Ave., Sunnyvale, CA 94085
1
EDS-100615 Rev B
Page 2
Preliminary
SGA-6486 DC-4500 MHz Cascadable MMIC Amplifier
Typical RF Performance at Key Operating Frequencies
Frequency (MHz)
Frequency (MHz)
Frequency (MHz)
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LROssoLnruteRtuptuOBd8.612.810.320.814.712.41
S
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VS = 8 V ID = 75 mA Typ. OIP3 Tone Spacing = 1 MHz, Pout per tone = 0 dBm
Test Conditions:
VS = 8 V ID = 80 mA Typ. OIP3 Tone Spacing = 1 MHz, Pout per tone = 0 dBm
R
= 39 Ohms TL = 25ºC ZS = ZL = 50 Ohms
R
= 39 Ohms TL = 25ºC ZS = ZL = 50 Ohms
BIAS
BIAS
Frequency (MHz)
Noise Figure vs. Frequency
VD= 5.1 V, ID= 75 mA
5
4
3
2
Noise Figure (dB)
1
0
00.511.522.53
Frequency (GHz)
TL=+25ºC
OIP3 vs. Frequency
VD= 5.1 V, ID= 75 mA
40
35
30
(dBm)
3
OIP
25
TL=+25ºC
20
0 0.5 1 1.5 2 2.5 3
Frequency (GHz )
Absolute Maximum Ratings
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Bias Conditions should also satisfy the following
expression: IDVD (max) < (TJ - TL)/R
25
23
21
(dBm)
19
1dB
P
17
15
00.511.522.53
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vs. Frequency
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VD= 5.1 V, ID= 75 mA
Frequency (GHz)
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Phone: (800) SMI-MMIC http://www.stanfordmicro.com726 Palomar Ave., Sunnyvale, CA 94085
2
EDS-100615 Rev B
Page 3
Preliminary
SGA-6486 DC-4500 MHz Cascadable MMIC Amplifier
S21 vs. Frequency
24
18
12
(dB)
21
S
VD= 5.1 V, ID= 75 mA
+25°C
-40°C
T
L
+85°C
6
0
012345
Frequency (GHz)
S12 vs. Frequency
-5
VD= 5.1 V, ID= 75 mA
+25°C
-9
T
-40°C
L
+85°C
-13
(dB)
12
-17
S
-21
-25
012345
Frequency (GHz)
S11 vs. Frequency
-5
VD= 5.1 V, ID= 75 mA
-10
-15
-20
(dB)
11
S
-25
-30
+25°C
T
-40°C
L
+85°C
-35
012345
Frequency (GHz )
S22 vs. Frequency
-5
VD= 5.1 V, ID= 75 mA
-10
-15
(dB)
22
-20
S
-25
+25°C
-40°C
T
L
+85°C
-30
012345
Frequency (GHz )
Phone: (800) SMI-MMIC http://www.stanfordmicro.com726 Palomar Ave., Sunnyvale, CA 94085
3
EDS-100615 Rev B
Page 4
SGA-6486 Basic Application Circuit
Preliminary
SGA-6486 DC-4500 MHz Cascadable MMIC Amplifier
V
S
RF in
R
BIAS
1 uF
1000
pF
C
D
L
C
Application Circuit Element Values
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005 058 0591 0042 0053
C
B
C
D
L
C
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1
C
B
C
B
SGA-6486
2
A64
3
C
V
S
R
BIAS
L
C
B
1 uF
1000 pF
C
D
C
B
RF out
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SAIB
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Mounting Instructions
1. Use a large ground pad area under device pins 2
and 4 with many plated through-holes as shown.
2. We recommend 1 or 2 ounce copper. Measurements
for this data sheet were made on a 31 mil thick FR-4
board with 1 ounce copper on both sides.
Part Identification Marking
The part will be marked with an A64 designator on
the top surface of the package.
3
4
A64
2
1
For package dimensions, refer to outline drawing at
www.stanfordmicro.com
Caution: ESD sensitive
Appropriate precautions in handling, packaging
and testing devices must be observed.
Phone: (800) SMI-MMIC http://www.stanfordmicro.com726 Palomar Ave., Sunnyvale, CA 94085
4
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Part Number Ordering Information
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EDS-100615 Rev B
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