T x B A S E B A N D / R F P R O C E S S O R
TM
TM
Enabling the future of communications.
RFT3100
bandpass filter normally
required between the
Figure 1. RFT3100 Processor Functional Block Diagram
upconverter and driver
VDDA
VDDD
VCONTROL
TX_I
amplifier, providing overall
board area and cost savings.
RFT3100 functionality is
specifically controlled from the
MSM device via the three-line
serial bus interface (SBI).
TX_IN
VDDM
VDDRF
CELLA_OUT
Σ
SSB
TX_Q
TX_QN
CELLB_OUT
PCSA_OUT
PCSB_OUT
0
90
1/2
Designed to meet the
requirements for global CDMA
markets, the RFT3100 device
will operate over the following
Tx frequency ranges:
DAC_IREF
SBCK
SBDT
SBST
SBI &
CONTROL
AB_SEL
PA_ON
Cellular band
824 MHz - 925 MHz
PCS band
PLL
1750 MHz - 1910 MHz
The range of supply voltage
for the RFT3100 device is from
2.7 V to 3.3 V, which provides
operating compatibility for
platforms utilizing a single-cell
Li-Ion battery design. RFT3100
operating modes are controlled
by the MSM and include
selective power-down, gain
control, and punctured CDMA
transmission (gated Tx power)
for optimal power savings and
talk-time improvement.
R F T 3 1 0 0 O V E R V I E W
The RFT3100™ Baseband-to-
Radio Frequency (RF) Transmit
Processor performs all transmit
(Tx) signal processing functions
required between the analog
baseband and the Power
integrated CDMA Tx solution
available, providing a board
area savings of more than 65
percent over previous
generation chipsets, the
RFT3100 device minimizes
power consumption for
extended talk-time performance. mixer for upconverting analog
baseband to IF, a
The RFT3100 device is
available in three
and MSM3300™ chipsets. The
baseband quadrature signals
are upconverted to the cellular
or PCS frequency bands and
amplified to provide signal drive
capability to the PA. The
Amplifier (PA) for IS-95 Code
Division Multiple Access
RFT3100 device includes an IF
(CDMA) cellular, JSTD-018
PCS, and ARIB-53 (Japan)
single-band and dual-band
applications. The RFT3100
device incorporates the
programmable Phase Locked
Loop (PLL) for generating Tx IF
frequency, single-sideband
upconversion from IF to RF, two
cellular and two PCS driver
amplifiers (dual-band version),
and Tx power control through
configurations: dual-band
cellular and PCS (RFT3100-1),
The RFT3100 device is
fabricated on an advanced
BiCMOS process, which
accommodates both precision
high-frequency analog circuits
and low-power CMOS functions,
and is available in a 32-pad
BCC++ plastic package.
previous-generation functionality cellular-only (RFT3100-2), and
of the IFT3000™ Baseband-to-
Intermediate Frequency (IF)
Processor together with RF
upconversion and driver
amplifiers. In addition to
offering the most advanced and QUALCOMM’s MSM3100™
PCS-only (RFT3100-3).
Utilizing an analog baseband an 85 dB variable gain
interface, the RFT3100 device
connects directly to
amplifier (VGA). The single-
sideband upconversion also
eliminates the need for a
QUALCOMM INCORPORATED CDMA TECHNOLOGIES 5775 MOREHOUSE DR. SAN DIEGO, CA 92121-1714 http://www.cdmatech.com <cdma-technologies@qualcomm.com> T (858)658-5005 F (858)658-1556