DESIGN APPLICATION NOTE --- AN022
SGA-9289 Amplifier Application Circuits
Abstract
SGA-9289
Silicon Germanium HBT Amplifier
Stanford Microdevices’ SGA-9289 is a high
performance SiGe amplifier designed for operation
from DC to 3500 MHz. The amplifier is manufactured
using the latest Silicon Germanium Heterostructure
Bipolar Transistor (SiGe HBT) process. The process
has a V
=8V and an f =25 GHz. The SiGe HBT
BCEO
T
process makes the SGA-9289 a very cost-effective
solution for applications requiring high linearity at
moderate biasing levels. This application note
illustrates several application circuits for key frequency
bands in the 800-2500 MHz spectrum.
Product Features
• DC-3500 MHz Operation
• High Output IP3, +41.5 dBm Typical at 1.96 GHz
• 11.0 dB Gain Typical at 1.96 GHz
• 28.6 dBm P1dB Typical at 1.96 GHz
• Cost Effective
Introduction
The application circuits were designed to achieve the
optimum combination of P
and OIP while
1dB
3
Applications
maintaining flat gain and reasonable return losses.
Special consideration was given to insure amplifier
stability at low frequencies where the device exhibits
high gain. These designs were created to illustrate the
general performance capabilities of the device under
CW conditions. Users may wish to modify these
designs to achieve optimum performance under
specific input conditions and system requirements.
• Wireless Infrastructure Driver Amplifiers
• CATV Amplifiers
• Wireless Data, WLL Amplifiers
The circuits contain only surface mountable devices
and were designed with automated manufacturing
requirements in mind. All recommended components
are standard values available from multiple
manufacturers. The components specified in the bill of
materials (BOM) have known parasitics, which in some
cases are critical to the circuit’s performance.
Deviating from the recommended BOM may result in a
performance shift due to varying parasitics – primarily
in the inductors and capacitors.
Absolute Maximum Ratings
Parameter
Base Current
Symbol
Value
Unit
IB
20
400
mA
mA
V
Collector Current
IC
Collector - Emitter Voltage
Collector - Base Voltage
Emitter - Base Voltage
Operating Temperature
Storage Temperature Range
Operating Junction Temperature
VCEO
VCBO
VEBO
TOP
Tstor
TJ
7.0
Biasing Techniques
18
V
These SiGe HBT amplifiers exhibit a “soft” breakdown
4.8
V
effect (V
=7.5V minimum) which allows for large
BCEO
-40 to +85
-40 to +150
+150
C
signal operation at V =5V. The user should insure
CE
C
that under large signal conditions the source and load
impedances presented to the device don’t result in
excessive collector currents near breakdown. Small
C
signal operation with V <7V is acceptable.
CE
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 2000 Stanford Microdevices, Inc. All worldwide rights reserved.
522 Almanor Ave., Sunnyvale, CA 94085
Phone: (800) SMI-MMIC
http://www.stanfordmicro.com
EAN-101535 Rev A
1
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