SKY77559数据手册Skyworks中文资料规格书

描述 Description

SKY77559 is a transmit and receive Front-End Module (FEM) with Integrated Power AmplifierControl (iPAC™) designed in a low profile, compact form factor for dual-band cellular handsetscomprising GSM850/900 and DCS1800/PCS1900 operation. The SKY77559 offers a completeTransmit VCO-to-Antenna and Antenna-to-Receive SAW filter solution. The FEM also supportsClass 12 General Packet Radio Service (GPRS) multi-slot operation.
The module consists of a GSM850/900 PA block and a DCS1800/PCS1900 PA block, impedancematchingcircuitry for 50 ohm input and output impedances, Tx harmonics filtering, high linearity /low insertion loss RF switch, and a Power Amplifier Control (PAC) block with internal current senseresistor. Two Heterojunction Bipolar Transistor (HBT) PA blocks, a BiFET PAC, and switch controlcircuit are fabricated onto a single Gallium Arsenide (GaAs) die. One PA block supports theGSM850/900 bands and the other PA block supports the DCS1800/PCS1900 bands. Both PAblocks share common power supply pads to distribute current. The output of each PA block andthe outputs to the two receive pads are connected to the antenna pad through an RF switch. TheGaAs die, Switch die and passive components are mounted on a multi-layer laminate substrate.The assembly is encapsulated with plastic overmold.
Band selection and control of transmit and receive are performed using four external control pads.Refer to the block diagram in Figure 1 below. The band select pad, BS, selects GSM850, GSM900,DCS, and PCS modes of operation.
Transmit enable TxEN controls receive or transmit mode of the RF switch (Tx = logic 1) and setsthe turn-on threshold for VRAMP (VRAMP threshold = V(TxEN) ÷ 7). Proper timing between transmitenable TxEN and Analog Power Control VRAMP allows for high isolation between the antenna andTx–VCO while the VCO is being tuned prior to the transmit burst.
The SKY77559 is compatible with logic levels from 1.2 V to 2.9 V for BS, TxEN, MODE, andVSW_EN pads.

特性 Features

• High efficiency: 42% (GSM850), 42% (GSM900), 42% (DCS1800), 41% (PCS1900)
• Low transmit supply current: 1.36 A (GSM850), 1.36 A (GSM900), 0.86 A (DCS1800/PCS1900)
• Internal ICC sense resistor for iPAC
• Closed loop iPAC
• 50 Ω matched Input/Output
• Tx–VCO-to-antenna and antenna-to-Rx-SAW filter RF interface
• RF switch affords high linearity, low insertion loss, and 0 V DC on Rx ports
• Small, low profile package: 6 mm x 6 mm x 0.9 mm, 28-pad configuration

应用 Application

• Smartphones