This circuit uses a darlington pair topology with resistive
feedback for broadband performance as well as stability
over its entire temperature range. Internally matched to
50 ohm impedance, the SGA-3486 requires only DC
blocking and bypass capacitors for external components.
SGA-3486
DC-2000 MHz Silicon Germanium
Cascadeable Gain Block
Small Signal Gain vs. Frequency
24
18
Product Features
•
DC-2000 MHz Operation
•
Single Voltage Supply
•
High Output Intercept: +24.6dBm typ. at 850 MHz
•
Low Current Draw: 35mA at 2.9V typ.
•
Low Noise Figure: 2.8dB typ. at 850 MHz
Applications
•
Oscillator Amplifiers
•
PA for Low Power Applications
•
IF/ RF Buffer Amplifier
•
Drivers for CATV Amplifiers
dB
12
6
1900
2400
3500
5000
100
500
900
0
Frequency MHz
Symbol
P
1dB
S
21
S
12
S
11
S
22
IP
3
NF
T
D
V
D
Parameters: Test Conditions:
Z
0
= 50 Ohms, Id = 35 mA, T = 25ºC
Output Power at 1dB Compression
Small Signal Gain
Reverse Isolation
Input VSWR
Output VSWR
Third Order Intercept Point
Noise Figure
Group Delay
Device Voltage
f = 850 MHz
f = 1950 MHz
f = DC - 1000 MHz
f = 1000 - 2000 MHz
f = DC - 2000 MHz
f = DC - 2000 MHz
f = DC - 2000 MHz
f = 850 MHz
f = 1950 MHz
f = DC - 1000 MHz
f = 1000 - 2000 MHz
f = 1000 MHz
Units
dB m
dB m
dB
dB
dB
-
-
dB m
dB m
dB
dB
pS
V
Min.
Typ.
12.7
12.5
Max.
19.0
21.2
18.0
23.1
1.67:1
1.33:1
24.6
26.9
2.8
3.4
119.0
2.6
2.9
3.2
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
EDS-100635 Rev A
Preliminary
Preliminary
SGA-3486 DC-2000 MHz 2.9V SiGe Amplifier
Specification
Parameter
Device Bias
Operating Voltage
Operating Current
500 MHz
Gain
Noise Figure
Output IP3
Output P1dB
Input Return Loss
Isolation
850 MHz
Gain
Noise Figure
Output IP3
Output P1dB
Input Return Loss
Isolation
1950 MHz
Gain
Noise Figure
Output IP3
Output P1dB
Input Return Loss
Isolation
2400 MHz
Gain
Noise Figure
Output IP3
Output P1dB
Input Return Loss
Isolation
Min
Typ.
2.9
35.0
22.4
2.8
25.4
12.3
15.7
24.8
21.2
2.8
24.6
12.7
12.9
24.4
18.0
3.4
26.9
12.5
12.0
23.1
16.5
3.5
28.1
12.4
10.8
22.1
Max.
Unit
T= 25C
V
mA
T= 25C
dB
dB
dB m
dB m
dB
dB
T= 25C
dB
dB
dB m
dB m
dB
dB
T= 25C
dB
dB
dB m
dB m
dB
dB
T= 25C
dB
dB
dB m
dB m
dB
dB
Test
Condition
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
EDS-100635 Rev A
Preliminary
Preliminary
SGA-3486 DC-2000 MHz 2.9V SiGe Amplifier
Pin #
1
Function
Description
RF IN
RF input pin. This pin requires the use of
an external DC blocking capacitor
chosen for the frequency of operation.
GND
Connection to ground. Use via holes for
best performance to reduce lead
inductance as close to ground leads as
possible.
RF OUT/ RF output and bias pin. DC voltage is
BIAS
present on this pin, therefore a DC
blocking capacitor is necessary for
proper operation.
GND
Sames as Pin 2
Device Schematic
2
3
4
Application Schematic for +5V Operation at 900 MHz
1uF
68pF
60 ohms
V
CC
=+5V
33nH
50 ohm
microstrip
2
1
3
100pF
4
100pF
50 ohm
microstrip
Application Schematic for +5V Operation at 1900 MHz
1uF
22pF
60 ohms
V
CC
=+5V
22nH
50 ohm
microstrip
2
1
3
50 ohm
microstrip
68pF
4
68pF
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
EDS-100635 Rev A
Preliminary
Preliminary
SGA-3486 DC-2000 MHz 2.9V SiGe Amplifier
S21, Id =35mA, T=+25C
24
18
S12, Id =35mA, T=+25C
0
-1 0
dB
12
6
1900
2400
3500
5000
100
500
900
0
dB
-2 0
-3 0
-4 0
100
500
900
1900
2400
3500
5000
5000
Frequency MHz
Frequency MHz
S11, Id =35mA, T=+25C
0
-1 0
S22, Id =35mA, T=+25C
0
-1 0
dB
-2 0
-3 0
-4 0
100
500
900
1900
2400
3500
5000
dB
-2 0
-3 0
-4 0
100
500
900
1900
2400
3500
Frequency MHz
Frequency MHz
S11, Id=35mA, Ta= +25C
Freq. Min = 0.1 GHz
Freq. Max = 2.0 GHz
S22, Id=35mA, Ta= +25C
Freq. Min = 0.1 GHz
Freq. Max = 2.0 GHz
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
EDS-100635 Rev A
Preliminary
Preliminary
SGA-3486 DC-2000 MHz 2.9V SiGe Amplifier
S21, Id =35mA, T=-40C
24
18
S12, Id =35mA, T=-40C
0
-1 0
dB
1 2
6
1900
2400
3500
5000
100
500
900
0
dB
-2 0
-3 0
-4 0
100
500
900
1900
2400
3500
5000
5000
Frequency MHz
Frequency MHz
S11, Id =35mA, T=-40C
0
-10
0
-1 0
S22, Id =35mA, T=-40C
dB
-20
-30
-40
100
500
900
1900
2400
3500
5000
dB
-2 0
-3 0
-4 0
100
500
900
1900
2400
3500
Frequency MHz
Frequency MHz
S11, Id=35mA, Ta= -40C
Freq. Min = 0.1 GHz
Freq. Max = 2.0 GHz
S22, Id=35mA, Ta= -40C
Freq. Min = 0.1 GHz
Freq. Max = 2.0 GHz
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.
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