Product Description
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.
Preliminary
Copyright 2000 Stanford Microdevices, Inc. All worldwide rights reserved.
1
EDS-101266 Rev B
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
522 Almanor Ave., Sunnyvale, CA 94085
SGA-4586
DC-4000 MHz Silicon Germanium HBT
Cascadeable Gain Block
Product Features
DC-4000 MHz Operation
Single Voltage Supply
High Output Intercept: +29 dBm typ. at 850 MHz
Low Current Draw: 45mA at 3.6V typ.
Low Noise Figure: 1.7dB typ. at 850 MHz
Applications
Oscillator Amplifiers
PA for Low Power Applications
IF/ RF Buffer Amplifier
Drivers for CATV Amplifiers
Stanford Microdevices SGA-4586 is a high performance
cascadeable 50-ohm amplifier designed for operation at
voltages as low as 3.6V. 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-4586 requires only DC blocking
and bypass capacitors for external components.
dB
Frequency GHz
Small Signal Gain vs. Frequency
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Preliminary
Preliminary
SGA-4586 DC-4000 MHz 3.6V SiGe Amplifier
EDS-101266 Rev B
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
522 Almanor Ave., Sunnyvale, CA 94085
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Key parameters, at typical operating frequencies:
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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(max) < (T
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- T
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)/Rth, j-l
3
Preliminary
Preliminary
SGA-4586 DC-4000 MHz 3.6V SiGe Amplifier
EDS-101266 Rev B
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
522 Almanor Ave., Sunnyvale, CA 94085
Rbias
68pF
22nH
1uF
22pF
68pF
50 ohm
microstrip
50 ohm
microstrip
V
S
Application Schematic for Operation at 850 MHz
Application Schematic for Operation at 1950 MHz
Rbias
100pF
33nH
1uF
68pF
100pF
50 ohm
microstrip
50 ohm
microstrip
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For 7.5V operation or higher, a resistor with a
power handling capability of 1/2W or greater
is recommended.
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