SKY65330 Overview
Key Specifications
Key Features
- Quad-band femto base stations and cellular repeaters for GSM850, EGSM900, DCS1800, and PCS1900 bands linearity and low insertion-loss pHEMT RF switches. A custom BiCMOS integrated circuit provides the internal PAC function, interface circuitry, and decoder circuitry to control the RF switches. Two Heterojunction Bipolar Transistor (HBT) PA blocks are fabricated onto an Indium Gallium Phosphide (InGaP) die; one block supports the GSM850 and EGSM900 bands, the other supports the DCS1800 and PCS1900 bands. Both PA blocks share common power supply pins to distribute current. Outputs from the PA blocks and four receive pins connect to the antenna using pHEMT RF switches. The InGaP die, the Silicon (Si) die, the pHEMT die, and the passive components are mounted on a multilayer laminate substrate, and the entire assembly encapsulated with plastic overmold. Three external control pins facilitate band selection, and control of the transmit and receive RF signal flows. Pin signals BS0 and BS1 select GSM850, EGSM900, DCS1800, or PCS1900 modes. The TR_EN pin signal selects the transmit or receive mode of the respective RF switch. Proper timing of the pin signal logic and power control (the VPC pin) allows high isolation between the antenna and the radio transceiver output. The PAC_EN signal enables the PAC circuitry to minimize battery drain. The low leakage current (6.5 µA, typical) of the dual PA module maximizes handset standby time. Feedback signals from the SKY65330 to the transceiver form an integral portion of the Skyworks Polar Loop™ architecture. This architecture autonomously splits amplitude and phase using the traditional analog In-Phase and Quadrature (I/Q) signals. The filter-saving advantage of the translation-loop approach is embedded in the architecture. Also included is an AM loop that provides both signal A
