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1.3 General DescriptionsMT6139 is a highly integrated RF transceiver IC for GlobalSystems for Mobile communication (GSM850, GSM900),Digital Cellular communication Systems (DCS1800), andPersonal Communication Services (PCS1900) quad bandcellular systems. The MT6139 includes four LNA’s, two RFquadrature mixers, a channel filter, a programmable gainamplifier for the receiver, a high precision IQ modulator forthe transmitter, a VCXO oscillator, on-chip regulators, and afully programmable sigma-delta
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