Product Description
Preliminary
1
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
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 2001 Stanford Microdevices, Inc. All worldwide rights reserved.
SGA-7489
DC-3000 MHz Silicon Germanium
HBT Cascadeable Gain Block
Product Features
DC-3000 MHz Operation
Single Voltage Supply
High Output Intercept: +36 dBm typ. at 850 MHz
Low Noise Figure: 2.9 dB typ. at 850 MHz
Applications
Oscillator Amplifiers
PA for Low / Medium Power Applications
IF/ RF Buffer Amplifier
Drivers for CATV Amplifiers
LO Driver Amplifier
Stanford Microdevices SGA-7489 is a high performance
cascadeable 50-ohm amplifier designed for operation at 5
Volts DC. This RFIC uses the latest Silicon Germanium
Heterostructure Bipolar Transistor (SiGe HBT) process
featuring 1 micron emitters with F
T
up to 50 GHz.
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-7489 requires only DC blocking
and bypass capacitors and a bias inductor for external
components. Frequency performance may be extended using
the 2 GHz application circuit shown on sheet 5.
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Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
2
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
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Operation of this device above any one of these parameters
may cause permanent damage.
Bias Conditions should also satisfy the following expression:
I
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* NOTE: P1dB and IP3 @1950,2400 MHz may be improved by using the tuned circuit shown on sheet 5
Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
3
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
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SGA-7489
SGA-7489 Basic Application Circuit
RF input
Cc1
Rbias
RF Output
Cc2
Lb
Cd
+Vs
Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
4
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
P1dB & IP3 vs. Frequency @ 3 Temps.
I
d
= 130 mA
10
15
20
25
30
35
40
45
0
100
200
300
400
500
600
700
800
900
Frequency (MHz)
Level (dBm)
P1dB(-40C)
P1dB(+25C)
P1dB(+85C)
IP3(-40C)
IP3(+25C)
IP3(+85C)
P1dB
IP3
S-Parameter Data @ -40C,+25C,+85C ,I
d
=130 mA
S21 v s. Freq. @-40C,+25C,+85C
0
6
12
18
24
30
0
500
1000
1500
2000
2500
3000
Fre que ncy (MHz)
S2
1
(
d
B
)
S21(-40C)
S21(+25C)
S21(+85C)
S11 v s. Freq. @-40C,+25C,+85C
-25
-20
-15
-10
-5
0
0
500
1000
1500
2000
2500
3000
Fre que ncy (MHz)
S11(
d
B
)
S11(-40C
S11(+25
S11(+85
S12 v s. Freq. @-40C,+25C,+85C
-30
-24
-18
-12
-6
0
0
500
1000
1500
2000
2500
3000
Frequency (M Hz)
S12(
dB)
S12(-40C)
S12(+25C)
S12(+85C)
S22 v s. Freq. @-40C,+25C,+85C
-40
-32
-24
-16
-8
0
0
500
1000
1500
2000
2500
3000
Frequency (M Hz)
S22(
dB)
S22(-40C
S22(+25
S22(+85
Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
5
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
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2 GHz Application Ckt. Board
Component Parts List
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Table of Delay Elements
Note: Separation Distance between via
holes on board represents approx. 5.4
Degrees phase shift @ 2GHz for equivalent
distance on microstrip.
Board material is GETEK,e=4.1
The SGA-7489 may be tuned in the manner
shown below for operation at 2 GHz.
Ground
Rb2
Rb1
Cd2
Cd1
Lb
CM2
Cc1
Cc1
CM1
SGA-7489
+Vcc
OUT
IN
ECB-100607 Rev-A
SOT-89 Eval Board
STANFORD MICRODEVICES
SGA-7489
SGA-7489 2 GHz Application Circuit
RF input
CM1
Cc1
CM2
Rb1
Rb2
Cd2
RF Output
Cc2
Lb
Cd1
Z3
Z2
Z1
+7V
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Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
6
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
S-Parameter Data for 2 GHz Tuned Application Circuit
S21 v s. Frequency , I
d
=130 mA, T=+25C
0
5
10
15
20
25
0
500
1000
1500
2000
2500
3000
Frequency (M Hz)
S21
(
dB)
S12 v s. Frequency , I
d
=130 mA, T=+25C
-50
-40
-30
-20
-10
0
0
500
1000
1500
2000
2500
3000
Frequency (M Hz)
S1
2(
dB)
S11 v s. Frequency , I
d
=130 mA, T=+25C
-30
-24
-18
-12
-6
0
0
500
1000
1500
2000
2500
300
Frequency (M Hz)
S11(
d
B
)
S22 v s. Frequency , I
d
=130 mA, T=+25C
-40
-32
-24
-16
-8
0
0
500
1000
1500
2000
2500
300
Frequency (M Hz)
S2
2(
dB)
Gain v s. Frequency for 2GHz Tuned
Circuit, I
d
= 130 mA, T=+25C
0
5
10
15
20
25
500
1000
1500
2000
2500
3000
Frequency (M Hz)
G
a
in
(d
B
)
P1dB & IP3 v s. Frequency for 2GHz
Tuned Circuit, I
d
=130 mA, T=+25C
0
5
10
15
20
25
30
35
40
500
1000
1500
2000
2500
3000
Frequency (M Hz)
Lev
e
l
(
d
Bm
)
P1dB
IP3
Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
7
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
Noise Figure vs. Frequency for SGA-7489 2GHz
Tuned Circuit ,I
d
=130 mA, T=+25C
0
2
4
6
8
10
1000
1500
2000
2500
3000
Frequency (MHz)
NF
(
d
B)
I
d
vs. V
d
Variation over Temperature for
Vs=7 Volts and Rbias = 15 Ohms for SGA-7489
80
100
120
140
160
180
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
V
d
(Volts)
I
d
(mA)
-40C
+85C
Pd
max(T j=150C)
=790mW
Plot of Vd vs. Temp. @ I
d
=130 mA (no signal)
4.6
4.7
4.8
4.9
5.0
5.1
5.2
5.3
-50
-30
-10
10
30
50
70
90
Temperature (Deg. C)
Vd (Volts)
Preliminary
Preliminary
SGA-7489 DC-3000 MHz 5V SiGe Amplifier
8
EDS-101801 Rev A
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
726 Palomar Ave., Sunnyvale, CA 94085
Part Number Ordering Information
r
e
b
m
u
N
t
r
a
P
e
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i
S
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R
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R
/
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c
i
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e
D
9
8
4
7
-
A
G
S
"
3
1
0
0
0
3
The part will be symbolized with A74 designator
on the top surface of the package.
Part Symbolization
Package Dimensions
PCB Pad Layout
DIMENSIONS ARE IN INCHES [MM]
4
A74
3
2
1
Caution: ESD sensitive
Appropriate precautions in handling, packaging and
testing devices must be observed.
#
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