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资源说明：1.3 General Descriptions
MT6139 is a highly-integrated RF transceiver IC for
the Global Systems for Mobile Communication
(GSM850/GSM900), Digital Cellular Communication
Systems (DCS1800), and Personal Communication
Services (PCS1900) cellular systems. It includes four
LNAs, two RF quadrature mixers, a channel filter, a
programmable-gain amplifier for the receiver, a
high-precision I/Q modulator for the transmitter, a 26
MHz VCXO reference, a fractional-N frequency
synthesizer with a fully-integrated LC-tank VCO and
three built-in LDO regulators for VCO, VCXO and
SDM. It is housed in a 40-pin QFN package with a
downset paddle for additional grounding. Figure 1
shows the MT6139 functional block diagram.
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