DATA SHEET
SKY77340 PA Module for Quad-Band GSM / EDGE
Applications
•
Quad-band cellular
handsets:
GMSK Modulation
- Class 4 GSM850/900
- Class 1
DCS1800/PCS1900
- Class 12 GPRS multi-slot
operation
EDGE modulation
- Class E2 GSM850/900
- Class E2 DCS1800/
PCS1900
Description
The SKY77340 Power Amplifier Module (PAM) is designed in a compact form factor for quad-band
cellular handsets comprising GSM850/900, DCS1800, PCS1900, supporting GMSK and linear EDGE
modulation. Class 12 General Packet Radio Service (GPRS) multi-slot operation is also supported.
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedance-
matching circuitry for 50
Ω
input and output impedances, and a Multi-function Power Amplifier
Control (MFC) block. A custom CMOS integrated circuit provides the internal MFC function and
interface circuitry.
Two separate Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto InGaP die; one
supports the GSM850/900 bands, the other supports the DCS1800 and PCS1900 bands. Both PA
blocks share common power supply pins to distribute current. The InGaP die, the silicon die, and the
passive components are mounted on a multi-layer laminate substrate. The assembly is encapsulated
with plastic overmold.
RF input and output ports are internally matched to 50
Ω
to reduce the number of external
components. Extremely low leakage current (2.5
µA,
typical) maximizes handset standby time. Band
select (BS) circuitry selects GSM transmit frequency band (logic 0) and DCS/PCS transmit frequency
band (logic 1). MODE circuitry selects GMSK modulation (logic 0) or EDGE modulation (logic 1). VRAMP
controls the output power for GMSK modulation and provides bias optimization for EDGE modulation
depending on the state of MODE control.
The integrated multi-function control (MFC) provides envelope amplitude control in GMSK mode,
reducing sensitivity to input drive, temperature, power supply, and process variation. In EDGE mode,
the MFC configures the PA for fixed gain, and provides the ability to optimize the PA bias operation at
different power levels. This circuitry regulates PA bias conditions, reducing sensitivity to temperature,
power supply, and process variation. The Enable input signal (pin 8) provides a standby state to
minimize battery drain.
Features
•
High efficiency:
- GSM850 54%
- GSM900 53%
- DCS 52%
- PCS 52%
•
Input/Output matching
50
Ω
internal (with DC
blocking)
•
16-pin MCM
•
Small outline
- 6 x 8 mm
•
Low profile
- 1.2 mm
•
Gold-plated, lead-free
contacts
•
Low APC current
- 10 uA
DCS/PCS_IN
Match
Match
DCS/PCS_OUT
VBATT
BS
EN
MODE
Multi-Function Controller
PA Bias
Gain Adjust
Power Control
etc.
Skyworks offers lead
(Pb)-free "environmentally
friendly" packaging
that is RoHS compliant
(European Parliament
for the Restriction of
Hazardous Substances).
VRAMP
VBIAS
GSM_IN
Match
Match
GSM_OUT
200147_001
Figure 1. SKY77340 Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200147A • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • October 17, 2006
1
SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
