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RF137
Transceiver For GSM Applications
The RF137 Transceiver is a highly integrated device optimized for use in singleband or multi-band Global System for Mobile Communications (GSM) applications. In the receive path, the device consists of selectable gain Intermediate Frequency (IF) amplifiers and an image reject downconverter with differential IF outputs. In the transmit path, the device consists of an In-Phase and Quadrature (I/Q) modulator and a frequency translational loop designed to perform frequency upconversion with high output spectral purity. This loop has a phase/frequency detector, a charge-pump, a mixer, and buffers for the required isolation between RF output, Local Oscillator (LO), and IF inputs.