EZZE MASS2, Technical Manual, Page: 70 / 137

Model MASS 2 Version V_1.0
Prepared by H/W Date 22/01/2008
Subject Technical Manual Page 48/59
RF section
RF Section is combined with Transceiver MT6120, VCTCXO CSX-325T26, Power Amplifier Module RF3166
and Front-End Module LMSP54HA-348(or 349). The MEGA2 was designed for Tri-Band according to FEM,
PCB Modify and S/W Matching.
The one type is GSM900, DCS1800 and PCS1900 with LMSP54HA-348. Another type(named MEGA2Q) is
GSM850, DCS1800 and PCS1900 with LMSP54HA-349.
I. MT6120 (RF Transceiver IC)
MT6120 includes LNAs, two RF quadrature mixers, an integrated channel filter, programmable gain amplifiers(PGA), an IQ
demodulator for the receiver, a precision IQ modulator with offset PLL for the transmitter, two internal TX VCOs, a VCXO,
on-chip regulators, and a fully programmable sigma-delta fractional-N synthesizer with an on-chip RF VCO.
Features Receiver
- Very low IF architecture
- Quad band differential input LNAs
- Quadrature RF mixers
- Fully integrated channel filter
- More than 100 dB gain
- More than 110 dB control range
- Image-reject down conversion to baseband
Transmitter
- Precision IQ modulator
- Translation loop architecture
- Fully integrated wideband TX VCO
- Fully integrated TX loop filter
Frequency Synthesizer
- Single integrated, fully programmable fractional- N synthesizer
- Fully integrated wideband RF VCO
- Fast settling time suitable for multi-slot GPRS application
Voltage Control Crystal Oscillator (VCXO)
- 26 MHz crystal oscillator capable of supporting 13 MHz / 26 MHz output clock
- Programmable capacitor array for coarse tuning
- Internal varactor for fine tuning
Regulators
- Built-in low-noise, low-dropout (LDO) regulators
Low power consumption
QFN (Quad Flat Non-lead) Package 56-pin SMD
3-wire serial interface