Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsMAX2009ETI+

General Description

The MAX2009 adjustable RF predistorter is designed to

improve power amplifier (PA) adjacent-channel power

rejection (ACPR) by introducing gain and phase expan-

sion in a PA chain to compensate for the PA’s gain and

phase compression. With its +23dBm maximum input

power level and wide adjustable range, the MAX2009

can provide up to 12dB of ACPR improvement for

power amplifiers operating in the 1200MHz to 2500MHz

frequency band. Lower frequencies of operation can be

achieved with this IC’s counterpart, the MAX2010.

The MAX2009 is unique in that it provides up to 7dB of

gain expansion and 24° of phase expansion as the

input power is increased. The amount of expansion is

configurable through two independent sets of control:

one set adjusts the gain expansion breakpoint

and slope, while the second set controls the same

parameters for phase. With these settings in place, the

linearization circuit can be run in either a static set-and-

forget mode, or a more sophisticated closed-loop

implementation can be employed with real-time soft-

ware-controlled distortion correction. Hybrid correction

modes are also possible using simple lookup tables to

compensate for factors such as PA temperature drift

or PA loading.

The MAX2009 comes in a 28-pin thin QFN exposed

pad (EP) package (5mm x 5mm) and is specified for

the extended (-40°C to +85°C) temperature range.

Applications

WCDMA/UMTS, cdma2000, DCS1800, and

PCS1900 Base Stations

Feed-Forward PA Architectures

Digital Baseband Predistortion Architectures

Military Applications

WLAN Applications

Features

♦ Up to 12dB ACPR Improvement*

♦ Independent Gain and Phase Expansion Controls

♦ Gain Expansion Up to 7dB

♦ Phase Expansion Up to 24°

♦ 1200MHz to 2500MHz Frequency Range

♦ Exceptional Gain and Phase Flatness

♦ Group Delay <1.3ns (Gain and Phase Sections

Combined)

♦ ±0.04ns Group Delay Ripple Over a 100MHz Band

♦ Capable of Handling Input Drives Up to +23dBm

♦ On-Chip Temperature Variation Compensation

♦ Single +5V Supply

♦ Low Power Consumption: 75mW (typ)

♦ Fully Integrated into Small 28-Pin Thin QFN

Package

*Performance dependent on amplifier, bias, and modulation.

MAX2009

1200MHz to 2500MHz Adjustable

RF Predistorter

________________________________________________________________ Maxim Integrated Products 1

28 27 26 25 24 23 22

8 9 10 11 12 13 14

MAX2009

GAIN

CONTROL

PHASE

CONTROL

GND*

ING

GND*

OUTP

GND*

CCG

GND*

PBRAW

PBEXP

PBIN

GND*

CCP

GND*

INP

GND*

PFS1

PFS2

PDCS1

PDCS2

GND*

OUTG

GND*

GCS

GFS

GBP

GND*

*INTERNALLY CONNECTED TO EXPOSED GROUND PADDLE.

Functional Diagram/

Pin Configuration

Ordering Information

19-2929; Rev 0; 8/03

*EP = Exposed paddle.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX2009ETI-T -40°C to +85°C

28 Thin QFN-EP*

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

Summary of content (19 pages)

PAGE 1
9-2929; Rev 0; 8/03 KIT ATION EVALU LE B A IL A AV 1200MHz to 2500MHz Adjustable RF Predistorter The MAX2009 adjustable RF predistorter is designed to improve power amplifier (PA) adjacent-channel power rejection (ACPR) by introducing gain and phase expansion in a PA chain to compensate for the PA’s gain and phase compression.
PAGE 2
MAX2009 1200MHz to 2500MHz Adjustable RF Predistorter ABSOLUTE MAXIMUM RATINGS VCCG, VCCP to GND ..............................................-0.3V to +5.5V ING, OUTG, GCS, GFS, GBP to GND......-0.3V to (VCCG + 0.3V) INP, OUTP, PFS_, PDCS_, PBRAW, PBEXP, PBIN to GND ............................-0.3V to (VCCP + 0.3V) Input (ING, INP, OUTP, OUTG) Level ............................+23dBm PBEXP Output Current ........................................................
PAGE 3
1200MHz to 2500MHz Adjustable RF Predistorter (MAX2009 EV kit, VCCG = VCCP = +4.75V to +5.25V, 50Ω environment, PIN = -20dBm, fIN = 1200MHz to 2500MHz, VGCS = +1.0V, VGFS = +5.0V, VGBP = +1.2V, VPBIN = VPDCS1 = VPDCS2 = 0V, VPF_S1 = +5V, VPBRAW = VPBEXP, TA = -40°C to +85°C. Typical values are at fIN = 2140MHz, VCCG = VCCP = +5V, TA = +25°C, unless otherwise noted.) (Notes 1, 2) PARAMETER CONDITIONS Operating Frequency Range VSWR MIN TYP 1200 ING, INP, OUTG, OUTP MAX UNITS 2500 MHz 1.
PAGE 4
MAX2009 1200MHz to 2500MHz Adjustable RF Predistorter AC ELECTRICAL CHARACTERISTICS (continued) (MAX2009 EV kit, VCCG = VCCP = +4.75V to +5.25V, 50Ω environment, PIN = -20dBm, fIN = 1200MHz to 2500MHz, VGCS = +1.0V, VGFS = +5.0V, VGBP = +1.2V, VPBIN = VPDCS1 = VPDCS2 = 0V, VPF_S1 = +5V, VPBRAW = VPBEXP, TA = -40°C to +85°C. Typical values are at fIN = 2140MHz, VCCG = VCCP = +5V, TA = +25°C, unless otherwise noted.
PAGE 5
1200MHz to 2500MHz Adjustable RF Predistorter Phase Control Section (MAX2009 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) SMALL-SIGNAL INPUT RETURN LOSS vs. FREQUENCY 6.0 TA = +85°C 5.9 TA = +25°C 5.8 5.7 TA = -40°C 5.6 10 15 D C 20 A 25 30 0 MAX2009TOC03 5 INPUT RETURN LOSS (dB) 6.1 MAX2009TOC02 6.2 5 10 C 15 20 25 D 30 B 5.5 35 5.4 B 40 5.3 4.95 5.05 5.15 2.1 2.3 1.
PAGE 6
Typical Operating Characteristics (continued) Phase Control Section (continued) (MAX2009 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) SMALL-SIGNAL GAIN vs. COARSE SLOPE -5.5 -6.0 -6.0 VCCP = 4.75V, 5.0V, 5.25V -5.5 MAX2009TOC08 -5.5 MAX2009TOC07 -5.0 SMALL-SIGNAL GAIN vs. COARSE SLOPE MAX2009TOC09 SMALL-SIGNAL GAIN vs. FREQUENCY TA = -40°C -6.0 -7.5 -8.0 -6.5 GAIN (dB) -7.0 GAIN (dB) GAIN (dB) -6.
PAGE 7
1200MHz to 2500MHz Adjustable RF Predistorter Phase Control Section (continued) (MAX2009 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) PHASE EXPANSION vs. INPUT POWER -6.4 D -6.8 -7.0 B C -7.4 170 A D 160 -7.6 A -2 3 8 13 18 23 -7.4 F -7.6 8 13 18 PHASE (DEGREES) 180 -6.6 -6.8 -7.0 C B -7.2 E D 13 18 190 B 170 160 A 150 -7.8 8 13 INPUT POWER (dBm) E = VPF_S1 = 2.
PAGE 8
Typical Operating Characteristics (continued) Phase Control Section (continued) (MAX2009 EV kit, VCCP = +5.0V, PIN = -20dBm, VPBIN = 0V, VPF_S1 = +5.0V, VPDCS1 = VPDCS2 = 0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) GAIN EXPANSION vs. INPUT POWER VPDCS1 = 5.0, VPF_S1 = 1.5V -5.8 PHASE (DEGREES) TA = -40°C GAIN (dB) VPDCS1 = 5.0, VPF_S1 = 1.5V 175 -6.3 -6.8 MAX2009TOC20 PHASE EXPANSION vs. INPUT POWER 180 MAX2009TOC19 -5.3 TA = +25°C -7.
PAGE 9
1200MHz to 2500MHz Adjustable RF Predistorter Gain Control Section (continued) (MAX2009 EV kit, VCCG = +5.0V, PIN = -20dBm, VGBP = +1.2V, VGFS = +5.0V, VGCS = +1.0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) LARGE-SIGNAL OUTPUT RETURN LOSS vs. FREQUENCY D 15 20 25 30 -14 15 -15 20 25 30 1.3 1.5 1.7 1.9 2.1 2.3 -19 1.1 2.5 SMALL-SIGNAL GAIN vs. FREQUENCY 1.7 1.9 2.1 2.3 -20 2.5 1.1 VGFS = 0V, 1.5V, 5.0V -11 -17 -13 -15 -17 -21 -23 -23 -20 -25 1.7 1.9 2.
PAGE 10
Typical Operating Characteristics (continued) Gain Control Section (continued) (MAX2009 EV kit, VCCG = +5.0V, PIN = -20dBm, VGBP = +1.2V, VGFS = +5.0V, VGCS = +1.0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) GROUP DELAY vs. FREQUENCY NOISE FIGURE vs. FREQUENCY 0.65 0.60 C A 22 0.55 B 20 A C 14 12 E 10 0.50 25 18 16 20 B E D D 1.5 1.7 1.9 2.1 2.3 5 1.5 2.1 2.3 2.5 1.
PAGE 11
1200MHz to 2500MHz Adjustable RF Predistorter Gain Control Section (continued) (MAX2009 EV kit, VCCG = +5.0V, PIN = -20dBm, VGBP = +1.2V, VGFS = +5.0V, VGCS = +1.0V, fIN = 2140MHz, TA = +25°C, unless otherwise noted.) GAIN EXPANSION vs. INPUT POWER -13 -13 C A, B D -17 C D -17 -19 -21 -21 -23 -23 -7 A, B -15 -19 -2 8 13 18 23 3 INPUT POWER (dBm) A = VGFS = 0V D = VGFS = 1.5V B = VGFS = 0.5V E = VGFS = 2.0V C = VGFS = 1.0V F = VGFS = 5.
PAGE 12
MAX2009 1200MHz to 2500MHz Adjustable RF Predistorter Pin Description PIN NAME 1, 2, 4, 5, 7, 8, 10, 16, 20, 22, 26, 28 FUNCTION GND Ground. Internally connected to the exposed paddle. 3 ING RF Gain Input. Connect ING to a coupling capacitor if it is not connected to OUTP. ING is interchangeable with OUTG. 6 OUTP RF Phase Output. Connect OUTP to a coupling capacitor if it is not connected to INP. OUTP is interchangeable with INP. 9 INP RF Phase Input. Connect INP to a coupling capacitor.
PAGE 13
1200MHz to 2500MHz Adjustable RF Predistorter Phase Expansion Breakpoint The phase expansion breakpoint is typically controlled by a digital-to-analog converter (DAC) connected through the PBIN pin. The PBIN input voltage range of 0V to VCC corresponds to a breakpoint input power range of 3.7dBm to 23dBm. To achieve optimal performance, the phase expansion breakpoint of the MAX2009 must be set to equal the phase compression breakpoint of the PA.
PAGE 14
MAX2009 1200MHz to 2500MHz Adjustable RF Predistorter PFS1 PF_S1 PHASE-CONTROL CIRCUITRY PFS2 2 PDCS1 PDCS2 SWITCH CONTROL MAX2009 Figure 2. Simplified Phase Slope Internal Circuitry PA GAIN COMPRESSION MAX2009 GAIN EXPANSION IMPROVED GAIN DISTORTION PIN (dBm) COMBINED GAIN (dB) SLOPE MAX2009 GAIN (dB) PA GAIN (dB) BREAKPOINT PIN (dBm) PIN (dBm) Figure 3.
PAGE 15
1200MHz to 2500MHz Adjustable RF Predistorter Gain Expansion Slope In addition to properly setting the breakpoint, the gain expansion slope of the MAX2009 must also be adjusted to compensate for the PA’s gain compression. The slope should be set using the following equation: MAX2009 _ SLOPE = −PA _ SLOPE 1 + PA _ SLOPE where: MAX2009_SLOPE = MAX2009 gain section’s slope in dB/dB. PA_SLOPE = PA’s gain slope in dB/dB, a negative number for compressive behavior.
PAGE 16
MAX2009 1200MHz to 2500MHz Adjustable RF Predistorter POWER AMPLIFIER POUT = 7dBm 6 OUTP 3 ING MAX2009 PREAMPLIFIER 9 INP OUTG 27 PIN = 14dBm 11 PFS1 GBP 23 VPF_S1 = 1.5V 12 PFS2 PHASE CONTROL 19 PBRAW 18 PBEXP VPBIN = 0.8V GAIN CONTROL PBIN PDCS1 PDCS2 GCS 17 25 13 14 GFS 24 VPDCS1 = 0V VPDCS2 = 5V Figure 4. AM-PM Response Tuning Circuit Power-Supply Bypassing Bypass each VCC pin with a 0.01µF capacitor. Table 1.
PAGE 17
1200MHz to 2500MHz Adjustable RF Predistorter MAX2009 PREAMPLIFIER GAIN = 7dB 6 3 OUTP ING MAX2009 POWER AMPLIFIER PREAMPLIFIER 9 INP OUTG 27 PIN = 14dBm 11 PFS1 GBP 23 VPF_S1 = 1.5V 12 PFS2 PHASE CONTROL 19 PBRAW 18 PBEXP VPBIN = 0.8V GAIN CONTROL PBIN PDCS1 PDCS2 GCS 17 25 13 14 GFS 24 VGBP = 1V VPDCS1 = 0V VGFS = 1.5V VPDCS2 = 5V VGCS = 1V Figure 5.
PAGE 18
1200MHz to 2500MHz Adjustable RF Predistorter MAX2009 Typical Application Circuit W = 10 mils** L = 160 mils C6 28 C10 PREAMPLIFER OUTP GND* GND* GBP GCS GFS 23 22 1 21 GAIN CONTROL 2 20 3 19 4 18 MAX2009 5 17 PHASE CONTROL 6 16 7 15 9 INP GND* 8 10 11 C2 C1 12 13 14 VCCG GND* C5 PBRAW PBEXP PBIN CONTROL UNIT GND* VCCP C4 PDCS2 GND* 24 PDCS1 GND* C9 25 PFS2 ING 26 PFS1 GND* W = 10 mils** L = 160 mils C8 27 GND* GND* OPTIONAL MATCH COMPENSATION* GND*
PAGE 19
1200MHz to 2500MHz Adjustable RF Predistorter QFN THIN.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2003 Maxim Integrated Products is a registered trademark of Maxim Integrated Products.