IDTF1358NBGI Datasheet, PDF (1/37 Pages) Integrated Device Technology – DPD Demodulator for PA Linearization

DPD Demodulator for PA Linearization
GENERAL DESCRIPTION
This document describes the specification for the
IDTF1358 Digital Pre-Distortion Demodulator for PA
linearization. This series of devices is offered in 3
variants to cover common UTRA bands.
COMPETITIVE ADVANTAGE
In typical basestation transmitters, digital pre-distortion
is employed to improve the Transmitter performance.
The signal coming out of the PA is sampled and the
incoming Tx chain I&Q data is pre-distorted to
counteract the distortion inherent in the PA. The PA
signal is adjusted via a digital step attenuator to a lower
level and then sub-sampled at an IF frequency of ~200
MHz which necessitates the need for a highly linear
demodulator to downmix to quadrature IF from the
Transmit frequency. By sampling IF_I and IF_Q
independently and then digitally combining these signals,
an effective doubling of the sample rate can be achieved.
Any distortion in this path will degrade the performance
of the DPD algorithm. By utilizing an ultra-linear
demodulator w/integrated DSA such as the IDTF1358,
the ACLR and/or power consumption of the full Tx
system can be improved significantly.
 GlitchFree^TM Technology gives better gain
control
 Zero-Distortion^TM eliminates the need for a
second IF amplifier in the channel
 ACLR is reduced for the full channel
 Power Consumption is reduced by 40%
 Integrates 2 BPFs, 2 Baluns, and a SPDT RF
switch
IDTF1358NBGI
Datasheet
3200 MHz to 4000 MHz
FEATURES
 Wide flat performance IF BW
 Wide RF and LO BWs (~ 800 MHz)
 LO can be High or Low Side
 Ideal for Multi-Carrier Systems
 Drives ADC directly
 Ultra linear +41 dBm OIP3
 Excellent ACLR performance
 200 Ω output impedance
 Fully integrated DPD demodulator
 Standby Mode w/Fast Recovery
 Current draw is 216 mA
 6 x 6 mm 36 pin package
FUNCTION BLOCK DIAGRAM
CLK
DATA
CSb
SPI
Zero-Distortion^TTMM
Glitch-Free^TTMM
DEC
.
IFI
Bias
Ctrl
90^O
STBY
ISET
2 _IBIAS
RFX
IFQ
RFY
LO
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height _{Tape &}
package
Reel
IDTF1358NBGI8
RF product Line
Green Industrial
Temp range
Zero-Distortion^TM, Glitch-Free^TM, DPD Receiver
1
Rev O, June 2015