PRELIMINARY PRODUCT SUMMARY
SKY77173 AutoSmart™ Power Amplifier Module for WCDMA
(1920–1980 MHz)
Applications
•
WCDMA handsets
The SKY77173 AutoSmart™ Power Amplifier Module (PAM) is a fully matched 8-pin surface mount
module developed for Wideband Code Division Multiple Access (WCDMA) handsets. This small and
efficient module packs full 1920–1980 MHz bandwidth coverage into a single compact package. The
SKY77173 meets the stringent spectral linearity requirements of WCDMA transmission with high
power added efficiency for power output of up to 28 dBm.
AutoSmart
TM
power amplifier technology internally adjusts the RF transistor bias level throughout the
dynamic operating range to minimize battery current consumption and ensure sufficient linear
performance to meet WCDMA system requirements. The result is a significant savings in average
battery current without the complications of a system-supplied mode function signal or analog bias
control. AutoSmart™ response time is more than adequate for RF access probe and discontinuous
transmission operation.
The single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all active
circuitry in the module. The MMIC contains on-board bias circuitry, as well as input and interstage
matching circuits. Output match into a 50-ohm load is realized off-chip within the module package to
optimize efficiency and power performance.
The SKY77173 AutoSmart™ PAM is manufactured with Skyworks’ GaAs Heterojunction Bipolar
Transistor (HBT) process that provides for all positive voltage DC supply operation while maintaining
high efficiency and good linearity. Primary bias to the SKY77173 is supplied directly from a three-cell
Ni-Cd, a single-cell Li-Ion, or other suitable battery with an output in the 3.2 to 4.2 volt range. Power
down is accomplished by setting the voltage on the low current reference pin to zero volts. No
external supply side switch is needed as typical “off” leakage is a few microamperes with full primary
voltage supplied from the battery.
Features
•
Low voltage positive bias
supply
- 3.2 V to 4.2 V
•
Low VREF
- 2.85 V, nominal
•
Low IREF
- less than 1 mA
•
Good linearity
•
High efficiency
•
Large dynamic range
•
8-pin package
- 3 x 3 x 1.15 mm
•
Power down control
•
InGaP
•
Supports low collector
voltage operation
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
VCC (4,5)
VBIAS (2)
VREF (1)
MODULE
Feedback
Control Circuit
Driver
Stage Bias
Power
Stage Bias
RF_IN (3)
Input
Match
DA
Inter-Stage
Match
PA
Output
Match
RF_OUT (6)
GND (7,8)
200464_001
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200646P1 • Skyworks Proprietary and Confidential Information. • Products and product information are subject to change without notice. • October 24, 2005
1
Copyright © 2005, Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products. These materials are provided by Skyworks as a service to its customers and may be
used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its documentation, products,
specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts,
incompatibilities, or other difficulties arising from future changes to its documentation, products, specifications and product descriptions.
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THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED OR OTHERWISE, RELATING TO SALE AND/OR USE OF SKYWORKS PRODUCTS
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