ADVANCE PRODUCT SUMMARY
SKY77321: PA Module for Tri-Band EGSM / GPRS
Applications
* Tri-band cellular handsets encompassing - Class 4 EGSM900 - Class 1 DCS1800 PCS1900 - GPRS (up to Class 12) multislot operation The SKY77321 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 12 General Packet Radio Service (GPRS) multislot operation. The PAM consists of an EGSM900 PA block, a DCS1800/PCS1900 PA block, impedance-matching circuitry for 50 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 Li-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 A, typical. The GaAs die, the Silicon (Si) die, and passive comments 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 to reduce the number of external components for a tri-band design. Extremely low leakage current (2 A, typical) of the dual PA module maximizes handset standby time. The SKY77321 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.
Features
* High efficiency - EGSM900 53% - DCS1800 47% - PCS1900 47% * Input/output matching - 50 internal * Small outline - 6 mm x 6 mm * Low profile - 1.2 mm maximum * Low APC current - 10 A typical * Gold plated, lead-free contacts
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
103158P4 * Skyworks Proprietary and Confidential information. * Products and product information are subject to change without notice. * April 23, 2004
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