SKY77318 iPAC™ PAM for Quad-Band GSM / GPRS

The SKY77318 Power Amplifier Module (PAM) is designed in a low profile (1.2 mm), compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800, and PCS1900 operation. The PAM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation. The module consists of separate GSM PA and DCS1800/PCS1900 PA blocks, impedance-matching circuitry for 50 Ω input and output impedances and a Power Amplifier Control (PAC) block with an internal current-sense resistor. The custom BiCMOS integrated circuit provides the internal PAC function and interface circuitry. Fabricated onto a single Gallium Arsenide (GaAs) die, one Heterojunction Bipolar Transistor (HBT) PA block supports the GSM bands and the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pads to distribute current. The GaAs die, the Silicon (Si) 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 of the SKY77318 are internally matched to a 50 Ω load to reduce the number of external components for a quad-band design. Extremely low leakage current (2.5 μA, typical) of the dual PA module maximizes handset standby time. The SKY77318 also contains bandselect switching circuitry to select GSM (logic 0) or DCS/PCS (logic 1) as determined from the Band Select (BS) signal. In Figure 1 below, the BS pad selects the PA output (DCS/PCS_OUT or GSM_OUT) and the Analog Power Control (VAPC) controls the level of output power. The VBATT pad connects to an internal current-sense resistor and interfaces to an integrated power amplifier control (iPAC™) function, which is insensitive to variations in temperature, power supply, process, and input power. The ENABLE input allows initial turn-on of PAM circuitry to minimize battery drain.

技术特性

Low input power range
- 0 to 6 dBm
High efficiency
- CELL 58%
- GSM 56%
- DCS 56%
- PCS 56%
BiCMOS PA controller and interface IC
- Low power control slope
- Fast response time
- Improved control accuracy
Integrated closed loop power amplifier control
Internal ICC sense resistor for PAC
Input/Output matching 50 Ω internal (with DC blocking)
20-pad package
Small outline: 6 x 6 mm
Low profile: 1.2 mm
MSL3/260 °C

应用领域 APPLICATION

Quad-Band cellular
handsets encompassing
- Class 4 GSM850/900
- Class 1 DCS1800/PCS1900
- Class 12 GPRS multi-slot operation

订购信息 Ordering Information

SKY77318

功能框图 Functional Block Diagram

应用技术支持与电子电路设计开发资源下载	版本信息	大小
SKY77318 数据资料DataSheet下载:pdf	Rev.V2	2 页