IDTF1370NBGI Datasheet, PDF (1/25 Pages) Integrated Device Technology – DPD Demodulator for PA Linearization

DPD Demodulator for PA Linearization
GENERAL DESCRIPTION
This document describes the specification for the
IDTF1370 Digital Pre-Distortion Demodulator for PA
linearization. This series of devices is offered in 2
variants to cover common UTRA bands. See part
number matrix below for additional detail.
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 IDTF1370, the ACLR and/or power
consumption of the full Tx system can be improved
significantly.
 DPD full path ACLR:  1 dB
 Icc: DPD function Power
Consumption  40%
 Zero-Distortion^TM Demod
eliminates 2 IF amps
 Integrates 2 BPFs, 2 Baluns,
SPDT RF switch
 Glitch-Free^TM gain control
Glitch-Free^TTMM
PART# MATRIX
Part#
F1320
F1370
RF range
550 - 1150
1300 - 2900
UTRA
bands
5,6,8,12,13,
14,17
1,2,3,4,9,10
7,21, 24, 38
IF freq
range
20 - 350
20 - 500
Typ.
Gain
12.5
12.5
Injection
High Side
or Low Side
High Side
or Low Side
IDTF1370NBGI
Datasheet
1300MHz to 2900MHz
FEATURES (I OR Q PATH)
 Wide flat performance IF BW
 Wide RF and LO BWs (~ 1.6 GHz)
 Ideal for Multi-Carrier Systems
 Drives ADC directly
 Ultra linear +41 dBm IP3_O
 Low Noise Figure
 Excellent ACLR performance
 200 Ω output impedance
 Fully integrated DPD demodulator
 6x6 36 pin package
 Standby Mode w/Fast Recovery
 I_CC: 275 mA
DEVICE BLOCK DIAGRAM
CSb SDI CLK
SPI
DEC
SPLIT
.
IFI
90^O
STBY
Bias
Control
ISET
2
IBIAS
RFIN_Y
RFIN_X
IFQ
LOIN
RF VCO
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height _{Tape &}
package
Reel
IDTF1370NBGI8
RF product Line
Green Industrial
Temp range
IDT Zero-Distortion^TM, Glitch-Free^TM DPD Receiver
1
Rev4, January 2014