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上传时间: 2011-05-30
详细说明： 1.3 General Descriptions MT6139 is a highly integrated RF transceiver IC for Global Systems for Mobile communication (GSM850, GSM900), Digital Cellular communication Systems (DCS1800), and Personal Communication Services (PCS1900) quad band cellular systems. The MT6139 includes four LNA’s, two RF quadrature mixers, a channel filter, a programmable gain amplifier for the receiver, a high precision IQ modulator for the transmitter, a VCXO oscillator, on-chip regulators, and a fully programmable sigma-delta fractional-N synthesizer with an on-chip LC VCO. The MT6139 includes control circuits to implement different operating modes. The device is housed in a 40-pin QFN SMD package with a downset paddle for additional grounding. A functional block diagram of the MT6139 and its pin assignment is shown in Figure 1 . ...展开收缩
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