103239p1.pdf

PRODUCT SUMMARY
SKY77161: PA Module for TD-SCDMA (2010-2025 MHz)
Applications
• TD-SCDMA handsets
Features
• Low voltage positive bias supply
- 3.2 V to 4.2 V
• Low VREF
- 2.85 V, nominal
• Supports low collector voltage
operation
• Good linearity
• High efficiency
• Large dynamic range
• 10-pin package
- 4 mm x 4 mm x 1.5 mm
• Power down control
• Low power-state control
• InGaP
The SKY77161 Power Amplifier Module (PAM) is a fully matched, 10-pin, surface mount
module developed for Time Division Synchronous Code Division Multiple Access
(TD-SCDMA) applications. Skyworks’ SKY77161 also supports TD-SCDMA multi-slot
operation.
This small and efficient module packs full 2010-2025 MHz bandwidth coverage into a single
compact package. The PAM meets the stringent spectral linearity requirements of TDSCDMA transmission, with high power added efficiency for power output of up to 28 dBm. A
low current pin (VCONT) is provided to improve efficiency for the low RF power range of
operation.
A single Gallium Arsenide (GaAs) Microwave Monolithic Integrated Circuit (MMIC) contains all
active circuitry in the module such as on-board bias circuit and input and interstage
matching circuits. Output match is realized off-chip within the module package to optimize
efficiency and power performance into a 50 Ω load.
This device 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 SKY77161 is supplied directly from a
three-cell Ni-Cad, a single cell Li-Ion, or other suitable batteries with outputs 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.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
103239P1 • Skyworks Proprietary and Confidential information. • Products and product information are subject to change without notice. • March 3, 2004
© 2004, Skyworks Solutions, Inc. All Rights Reserved.
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