GC5328 Datasheet, PDF (2/27 Pages) Texas Instruments – GC5328 Low-Power Wideband Digital Predistortion Transmit Processor

GC5328
SLWS218A – OCTOBER 2009 – REVISED OCTOBER 2009
www.ti.com
The CFR block has four serial stages of peak detection and cancellation. The CFR block cancellation filter can
be programmed as real or complex. The CFR peak-reduced output is routed to the Farrow resampler. The
Farrow resampler resamples the CFR output to the DPD clock rate. The Farrow resampler block also has a
complex mixer for composite carrier frequency offset.
The DPD subsystem has a circular limiter, nonlinear DPD correction, and a transmit equalizer. The DPD
correction can reduce the follow-on circuitry distortion products. The DPD output is sent to the BUC. The BUC
provides a post-DPD interpolation, and also provides a complex mixer for frequency offset. The DAC interface
converts the BUC signal output to the interleaved IQ or parallel IQ output signals for the DAC5682Z or DAC5688.
The CB block captures the selected internal reference signal, and the feedback block in two up to 4K capture
buffers. The signal capture can be based on an externally timed event (standard capture buffer), delay after a
timed event, or signal statistics (smart capture buffer). Normally the DPD input and feedback output are selected.
The capture buffers are stored and read by the microprocessor.
The FB block receives the LVDS ADC information and performs signal processing to downconvert the received
signal to 0IF. The FB block also has a feedback-path receive equalizer.
GC5328
TCK
RESETB SYNC SYNC INT UPDATA UPADDR OEB RDB WRB CEB TRST TD
3 ^OUT
16
10
TI
TMS 4
BBin
16
BBFR
1
Pilot
Insertion
Gain
Pilot
Insertion
AntCal
Insertion
Power
Meter
ADCin
(LVDS)
ADCin 16
(LVDS)
2
MAGout
16
MAGclk
DACout
38
ADC
Interface
Envelope
Interface
DAC
Interface
Medium ^{NarrowBand DUC}
Band NarrowBand DUC
Wide DUC _{NarrowBand DUC}
Band
DUC Medium ^{NarrowBand DUC}
Band NarrowBand DUC
DUC _{NarrowBand DUC}
+
Medium ^{NarrowBand DUC}
Band NarrowBand DUC
Wide DUC _{NarrowBand DUC}
Band
DUC Medium ^{NarrowBand DUC}
Band NarrowBand DUC
DUC _{NarrowBand DUC}
CFR
Real to Complex
To Capture
Buffer
Feedback
Equalizer
To Capture
Buffer
Feedback Mixer
and NL Correction
To Capture
Buffer
MPU Interface
Fractional
Resampler
Circular
Limiter
Bulk Interpolation
+ Mixer
Transmit
Equalizer
DPD
JTAG
BB
PLL
DPD
PLL
BBclk
DPDclk
SYNC
DUCs in
1-Chn Mode
Capture Buffers
DUCs in
2-Chn Mode
DUCs in
6-Chn Mode
BB Clock Domain
DPD Clock Domain
Figure 2. GC5328 Functional Block Diagram
Active Only in Dual
Antenna Mode
B0279-03
2
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