5
The RTR6250 device's voltage range is from 2.7 to 3.1 V, which
provides operating compatibility for platforms utilizing a single-cell Li-
Ion battery design. The RTR6250 device is fabricated on an advanced
SiGe BiCMOS process, which accommodates both precision high-
frequency analog circuits and low-power CMOS functions, and is
provided in a 56QFN plastic package.
RTR6250 Device Description
The RTR6250 is a highly integrated RF device that
incorporates a UMTS transmitter with a quad-band
GSM/GPRS transceiver. It derives its architecture
from QUALCOMM's radioOne direct conversion
devices for CDMA.
RTR6250 Device Features
RTR6250 UMTS Transmit Section
• Complete direct upconversion from analog baseband to UMTS Tx,
plus a complete direct conversion GSM 850/900/1800/1900
receiver
The RTR6250 UMTS baseband-to-RF transmit section performs all
transmit (Tx) signal processing functions required between QCT's
MSM6250 chip and the power amplifier (PA) for UMTS. Its direct
upconversion architecture offers an advanced, tightly integrated UMTS
Tx solution, which simplifies RF PCB design, shortens development
cycle time, and reduces BOM and current consumption over
traditional superheterodyne architectures.
• Integrated UMTS Transmitter
• Eliminates image-reject filter between UMTS upconverter and driver
amplifier
• UMTS Tx power control through 85 dB dynamic range VGA
• Integrated synthesizer and LO generator system for GSM Tx/Rx and
UMTS Tx bands, eliminating external RF components
• Two UHF PLLs designed to support fast channel acquisition for
GPRS and 3GPP compress mode operation
• GSM receivers with settable gain states
It is designed to meet the requirements for global UMTS FDD markets,
providing operation in the UMTS 1900 band (1850 MHz - 1910 MHz)
and UMTS 2100 band (1920 MHz - 1980 MHz).
• Integrated differential LNAs, mixers and baseband filter for receive
quad-band GSM operation
RTR6250 GSM/GPRS Transceiver Section
The RTR6250 device also has an integrated transceiver for GMS
bands and supports both GSM and GPRS modes. It contains a quad-
band GSM translation loop transmitter which consists of low pass
filtering with DC offset correction circuitry, I/Q modulators and offset
phase locked loop (OPLL). The GSM receiver contains four LNAs,
direct conversion mixers and low pass filtering. Also on-chip are two
UHF PLLs designed to support Fast Channel Acquisition for GPRS and
3GPP Compress Mode operation.
• Translational Loop Transmitter for GSM
• DC auto-calibration system for GSM Rx operation
• Supply voltage from 2.7 to 3.1 V
• 56QFN (quad flat none-lead) package (8 mm x 8 mm)
QUALCOMM [ QUALCOMM INCORPORATED ]
