IDTF1320NBGI Datasheet, PDF (1/28 Pages) Integrated Device Technology – DPD Demodulator for PA Linearization

DPD Demodulator for PA Linearization
GENERAL DESCRIPTION
This document describes the specification for the
IDTF1320 Digital Pre-Distortion Demodulator for PA
linearization. This device is one of 2 variants to cover
common UTRA bands. See the Part# Matrix below for
details.
COMPETITIVE ADVANTAGE
In typical basestation transmitters a digital pre-distortion
loop is employed to improve the Transmitter
performance. The signal coming out of the PA is
sampled so that the I&Q data at Baseband can be pre-
distorted before being sent to the Tx DAC to counteract
the distortion inherent in the downstream PA. The signal
coupled from the PA 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 IDTF1320, 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,
2 SP2Ts
 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
IDTF1320N_F1B₃G₀I₀
Datasheet_DATASHEET
ARY DATASHEET
550MHz to 1150MHz
FEATURES (I OR Q PATH)
 Wide flat performance IF BW
 Wide RF and LO BWs (~ 0.8 GHz)
 Ideal for Multi-Carrier Systems
 Drives ADC directly
 Ultra linear +43 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: 262 mA
DEVICE BLOCK DIAGRAM
CSb SDI CLK
SPI
DEC
SPLIT
RFIN_Y
RFIN_X
.
RFSW
LOSW
LOIN_A
LOIN_B
RF VCO
IFI
90^O
STBY
Bias
Control
ISET
2
IBIAS
IFQ
ORDERING INFORMATION
Omit IDT
prefix
0.8 mm height _{Tape &}
package
Reel
IDTF1320NBGI8
RF product Line
Green Industrial
Temp range
IDT Zero-Distortion^TM, Glitch-Free^TM DPD Receiver
1
Rev4 January 2014