CX77304-17 Datasheet, PDF (1/15 Pages) Skyworks Solutions Inc. – CX77304-17 PA Module for Tri-band EGSM DCS PCS / GPRS

DATA SHEET
CX77304-17 PA Module for Tri-band EGSM DCS PCS / GPRS
Applications
• Tri-band cellular handsets
encompassing
- Class 4 EGSM900
- Class 1 DCS1800
- PCS1900, and
- Up to Class 10 GPRS
multi-slot operation
Features
• High efficiency
- EGSM 55%
- DCS 50%
- PCS 45%
• Input/output matching
- 50 Ω internal
• Small outline
- 9.1 mm × 11.6 mm
• Low profile
- 1.5 mm
• Low APC current
- 10 µA typical
• Gold plated, lead-free
contacts
Description
The CX77304-17 Power Amplifier Module (PAM) is designed in a compact form factor for tri-band
cellular handsets comprising EGSM900, DCS1800, and PCS1900 operation. It also supports Class 10
General Packet Radio Service (GPRS) multi-slot operation.
The PAM consists of an EGSM900 PA block, a DCS1800/PCS1900 PA block, impedance-
matching circuitry for 50 Ω input and output, and bias control circuitry. Two separate Heterojunction
Bipolar Transistor (HBT) PA blocks are fabricated on a single Gallium Arsenide (GaAs) die. One PA
block operates in the EGSM900 band and the other PA block supports both the DCS1800 and the
PCS1900 bands. Optimized for lithium ion battery operation, both PA blocks share common power
supply pins to distribute current. A custom CMOS integrated circuit provides the internal interface
circuitry, including a current amplifier that minimizes the required power control current (IAPC) to 10
µA, typical. The GaAs die, the Silicon (Si) die, and passive components are mounted on a multi-layer
laminate substrate. The assembly is encapsulated with plastic overmold.
The RF input and output ports are internally matched to 50 Ω to reduce the number of external
components for a tri-band design. Extremely low leakage current (2 µA, typical) of the dual PA module
maximizes handset standby time. The CX77304-17 also contains band-select switching circuitry to
select EGSM (logic 0) and DCS/PCS (logic 1) as determined from the Band Select (BS) signal. In
the block diagram shown below, the BS pin selects the PA output (DCS/PCS OUT or EGSM OUT) while
the Analog Power Control (APC) controls the level of output power.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
101943B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice. • July 29, 2004
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