Overview: .. CX74063
RF Transceiver for Multi-Band GSM/GPRS/EDGE Applications with Integrated Crystal Oscillator and Power Ramping Controller
The CX74063 transceiver is a highly integrated device for multi-band Global System for Mobile munications™ (GSM™) or General Packet Radio Service (GPRS) applications. The device requires a minimal number of external ponents to plete a GSM radio subsystem. The CX74063 supports GSM850, EGSM900, DCS1800, and PCS1900 applications. The receiver also supports downlink Enhanced Data-Rate GSM Evolution (EDGE). The receive path implements a direct down-conversion architecture that eliminates the need for Intermediate Frequency (IF) ponents. The CX74063 receiver consists of three integrated Low Noise Amplifiers (LNAs), a quadrature demodulator, tunable receiver baseband filters, and a DC-offset correction sequencer. In the transmit path, the device consists of an In-phase and Quadrature (I/Q) modulator within a frequency translation loop designed to perform frequency upconversion with high output spectral purity. This loop also contains a phasefrequency detector, charge pump, mixer, programmable dividers, and high power transmit Voltage Controlled Oscillators (VCOs) with no external tank required. With the integrated gain controller (and an integrator ), the device realizes the Power Amplifier Control (PAC) functionality when bined with a coupler, a Radio Frequency (RF) detector and a Power Amplifier (PA).
