IDTF1370NBGI
Datasheet
DPD Demodulator for PA Linearization
1300MHz to 2900MHz
FEATURES (I OR Q PATH)
GENERAL DESCRIPTION
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 IP3O
Low Noise Figure
Excellent ACLR performance
200 Ω output impedance
Fully integrated DPD demodulator
6x6 36 pin package
Standby Mode w/Fast Recovery
ICC: 275 mA
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
DEVICE BLOCK DIAGRAM
CSb SDI CLK
SPI
DEC
IFI
SPLIT
STBY
ISET
Bias
Control
2
90O
.
IBIAS
consumption of the full Tx system can be improved
significantly.
RFIN_Y
RFIN_X
IFQ
DPD full path ACLR: 1 dB
Icc: DPD function Power
Consumption 40%
LOIN
RF VCO
Zero-DistortionTM Demod
eliminates 2 IF amps
Integrates 2 BPFs, 2 Baluns,
SPDT RF switch
ORDERING INFORMATION
Glitch-FreeTM gain control
Omit IDT
0.8 mm height
package
Tape &
Reel
TM
Glitch-FreeTM
prefix
PART# MATRIX
IDTF1370NBGI8
Part#
F1320
F1370
RF range
550 - 1150
1300 - 2900
UTRA
bands
IF freq
range
Typ.
Gain
Injection
RF product Line
Green Industrial
5,6,8,12,13,
14,17
High Side
or Low Side
Temp range
20 - 350
12.5
1,2,3,4,9,10
7,21, 24, 38
High Side
or Low Side
20 - 500
12.5
IDT Zero-DistortionTM, Glitch-FreeTM DPD Receiver
1
Rev4, January 2014