SKY77597-11

Tx-Rx FEM for Quad-Band GSM/GPRS/EDGE, and Dual-Band TD-SCDMA w/ Six Linear TRx Switch Ports, and High Band Power Amplifier Output for SVLTE Applications w/ SP2T Switch; • Small, low profile package: 6 mm x 6 mm x 0.9 mm, 28-pad configuration\n• Low input power range 0 dBm to 6 dBm\n• High efficiency\n• Tx-VCO-to-antenna and antenna-to-Rx-SAW filter RF interface\n• Tx harmonics below –40 dBm\n• Current limiting for over-voltage protection and extended battery life\n• I/O matched internally to 50 \u001E\n• High impedance control inputs: 20 μA, maximum\n• Power control circuitry built-in for improved TRP variation;

Please note: SKY77597-11 is being discontinued and is not recommended for new designs. SKY77597-11 is a transmit and receive Front End Module (FEM) designed in a very low profile (0.9 mm) and compact form factor for quad-band cellular handsets comprising GSM850/900, DCS1800/PCS1900 operation and dual-band TD-SCDMA bands 34 and 39 operation—a complete transmit VCO-to-Antenn©a and Antenna-to-receive SAW filter solution. The FEM also supports Class 12 General Packet Radio Service (GPRS) multi-slot operation and linear EDGE operation. 3G switch-through support is provided by six dedicated high-linearity ports. High band Tx (DCS1800) is brought out to a module pad through an integrated SP2T switch for SVLTE applications.\n\nThe module consists of a GSM850/900 PA and DCS1800/PCS1900/TD-SCDMA PA block, impedance-matching circuitry for 50 \u001E input and output impedances, Tx harmonic filtering, a high linearity/low insertion loss switch, and a CMOS Power Amplifier Control (PAC) block. A custom silicon integrated circuit contains decoder circuitry to control the RF switch while providing a low current, external control interface.\n\nFabricated in GaAs, the Heterojunction Bipolar Transistor (HBT) PA blocks support the GSM850/900 bands and DCS1800/PCS1900 bands and TD-SCDMA bands 34/39. Both PA blocks share common power supply pads to distribute current. The output of the PA block and the outputs to the six receive pads connect to the antenna pad through a high-linearity antenna switch. The 3G and Rx ports feature a 0 V DC offset level which eliminates the need for external blocking capacitors. The GaAs die, switch die, CMOS controller die, and passive components are mounted on a multi-layer laminate substrate and the entire assembly is encapsulated with plastic overmold.\n\nRF input and output ports of the SKY77597-11 are internally matched to a 50 \u001E load to reduce the number of external components on the phone board. Extremely low leakage current of the FEM maximizes handset standby time. Control of transmit and receive RF signal flows, and band selection are performed by four external control pads (see Figure 1 on overleaf). Mode of operation, Tx vs. Rx, and Band (GSM850, GSM900, DCS1800, PCS1900, and Bands 34/39) are controlled with the four logic inputs: Mode, TxEN, BS1, and BS2. Proper timing of the TxEN input and the VRAMP input ensures high isolation between the antenna and Tx-VCO while the VCO is being tuned prior to the transmit burst.\n\nThe integrated power amplifier control (PAC) function provides envelope amplitude control while reducing sensitivity to input drive, temperature, power supply, and process variation. Output power variation into mismatch is minimized with Skyworks’ Finger-Based Integrated Power Amplifier Control (FB-iPAC) control circuit.

SKY77597-11

Tx-Rx FEM for Quad-Band GSM/GPRS/EDGE, and Dual-Band TD-SCDMA w/ Six Linear TRx Switch Ports, and High Band Power Amplifier Output for SVLTE Applications w/ SP2T Switch

SKY77597-11

SKYWORKS
SMD

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SKYWORKS

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SKYWORKS
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