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 .