X9470V24I【PDF 1/24 页】IC BIAS CTRLR RF PA 24-TSSOP

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W DESIG

F OR N E

COMME

RE PL AC

N OT R E E NDED r at

al Suppo il.com/tsc

NO R E C

PRELIMINARY Data Sheet

our Tech r www.inters

contact

1-888-IN

N DED EM ENT

nic

T ER SIL o

March 8, 2005

X9470

FN8204.0

RF Power Amplifier (PA) Bias Controller

FEATURES

? Programmable Bias Controller IC for Class A

and AB LDMOS Power Amplifiers

? Adaptive System on Chip Solution

? Bias Current Calibration to better than ±4%

using Reference Trim DCP

? Automatic Bias Point Tracking and Calibration

— I DQ Sensing and Tracking

—Programmable Instrumentation Amplifier to

Scale Wide Range of I DQ

—Programmable Gate Bias Driver

—All Programmable settings are Nonvolatile

—All Settings Recalled at Power-up.

? 28V Maximum V DD

? 2 Wire Interface for Programming Bias Setting

and Optimizing I DQ Set Point

? Bias Level Comparator

? Shutdown Control pin for PA Signal

? Slave address to allow for multiple devices

? 24-pin TSSOP Package

? Applications: Cellular Base Stations (GSM,

UMTS, CDMA, EDGE), TDD applications, Point-

to-multipoint, and other RF power transmission

systems

TYPICAL APPLICATION

DESCRIPTION

The Intersil X9470 RF PA Bias Controller contains all of

the necessary analog components to sense the PA

drain current through an external sense resistor and

automatically control the gate bias voltage of an

LDMOS PA. The external sense resistor voltage is am-

plified by an instrumentation amplifier and the output of

the amplifier along with an external reference voltage is

fed to the inputs of a comparator. The comparator out-

put indicates which direction the LDMOS gate bias volt-

age will move in the next calibration cycle. System

calibration is accomplished by enabling the X9470 and

providing a clock to the SCL pin. The LDMOS drain cur-

rent can be maintained constant over temperature and

aging changes by periodic calibration. The VOUT pin

can be used to monitor the average power by tracking

the drain current. Up to eight X9470 or additional Inter-

sil Digital Potentiometers can be controlled via a two-

wire serial bus.

INC/DEC

RW REF RH REF RL REF

R REF

AGND

V OUT

V+

V DD

V SENSE+

C BULK

Comparator

V REF

Instrumentation

Amplifier

? V

V SENSE–

R SENSE

SDA

I2C

interface

VREF

control

choke

SCL

Control &

Status Registers

Vbias

control

R BIAS

–

V BIAS

FILTER

out

RF PA in

EEPROM

Matching

RF Impedance

VCC

VSS

RH BIAS RW BIAS RL BIAS

SHDN

Class A Example

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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