GC5322IZND Datasheet, PDF (1/4 Pages) Texas Instruments – Wideband Digital Pre-Distortion Transmit IC Solution

GC5322
Wideband Digital Pre-Distortion
Transmit IC Solution
Product Bulletin
The Texas Instruments GC5322 wireless
transmit processor integrates digital radio
functionality previously only available in
discrete devices. The GC5322 linearizes
the output of the power amplifier (PA) in
the transmit signal chain, thus removing
the need for more costly high-performance
PA components, improving the PA’s power
efficiency and decreasing the overall
power consumption of the base station.
High-performance PAs can account for as
much as 30 percent of the operational costs
of a wireless base station in today’s cellular
infrastructure. The GC5322 solution gives
wireless equipment manufacturers the
opportunity to reduce the overall cost of their
RF subsystems.
Integrated functionality
To optimize the overall system cost and
performance of a base station, the GC5322
has integrated the critical functionality
required in a wireless transmit processor. The
key processing blocks in the GC5322 include
wideband DUC, CFR and DPD to linearize the
output of the PA. Both CFR and DPD increase
the power efficiency of the transmit chain’s
multi-carrier PA. The DPD algorithm improves
the adjacent channel leakage ratio (ACLR)
thereby increasing PA output power while
adhering to spectral emission regulations.
By integrating these three blocks into one
device, the GC5322 simplifies the design
of the base station RF subsystem, reduces
procurement costs by minimizing chip counts,
and decreases circuit board size. Additionally,
the inherent flexibility of the software DPD
algorithm allows the GC5322 to support
multiple existing and emerging standards.
Digital upconverter –The DUC block of
the GC5322 supports up to 40 MHz of
signal bandwidth. The DUC combines up to
12 channels into one wideband, composite
signal. Operating at a maximum 280-MHz clock
rate, the DUC outputs up to 70 mega-samples
per second (MSPS) for single antenna configu-
rations. For each output channel, a number
of parameters such as gain, phase, delay and
equalization can be specified for smart antenna
applications. When not in use, the DUC
channels can be turned off to save power.
Baseband
generation
Digital
upconversion
Crest factor
reduction
Digital
pre-distortion
To Tx DAC
The GC5322 integrates digital upconversion, crest factor reduction, and digital pre-distortion
Key Features
• Integrated functional transmitter
blocks include:
• Digital upconverter (DUC),
supporting wideband signals
• Crest factor reduction (CFR)
for greater PA power efficiency
• Digital pre-distortion (DPD)
for improved PA linearity
• Highly-integrated IC solution reduces
design complexity, power consumption,
development time, implementation size
and BOM costs
• Advanced linearization solution relaxes
multi-carrier power amplifier specifications
and increases PA DC operating efficiency
• Flexible DSP algorithm supports existing
and emerging wireless standards
• Integrated CFR and DPD increase
efficiencies 25 percent or more for
Class AB PAs and reaching 40 percent
or more for Doherty PAs
• Integrated DPD reduces adjacent
channel leakage ratio (ACLR) by 20 dB
or more and corrects up to 7th order
distortion products
• Integrated IQ imbalance correction
and a fully automated channel equalizer
• Extremely fast DPD convergence times,
typically less than 2 seconds
• Robust convergence algorithm allows
dynamic carrier allocation, without
disrupting cellular service
• Fast time to market and reduced risk
as part of a complete TI-supplied signal
chain solution
• Space-saving 352-ball TE-PBGA-II
27 x 27 mm package.