X9470 Datasheet: RF Power Amplifier (PA) Bias Controller





X9470 RF Power Amplifier (PA) Bias Controller Datasheet

Part Number X9470
Description RF Power Amplifier (PA) Bias Controller
Manufacture Xicor
Total Page 25 Pages
PDF Download Download X9470 Datasheet PDF

Features: Preliminary Information RF Power Ampli er (PA) Bias Controller FEATURES • Programmable Bias Controller IC for Cla ss A and AB LDMOS Power Amplifiers • Adaptive System on Chip Solution • B ias Current Calibration to better than ±4% using Reference Trim DCP • Autom atic Bias Point Tracking and Calibratio n — IDQ Sensing and Tracking —Progr ammable Instrumentation Amplifier to S cale Wide Range of IDQ —Programmable Gate Bias Driver —All Programmable se ttings are Nonvolatile —All Settings Recalled at Power Up. • 28V Maximum V DD • 2 Wire Interface for Programming Bias Setting and Optimizing IDQ Set Po int • Bias Level Comparator • Shutd own Control pin for PA Signal • Slave address to allow for multiple devices • 24-pin TSSOP Package • Applicatio ns: Cellular Base Stations (GSM, UMTS, CDMA, EDGE), TDD applications, Pointto- multipoint, and other RF power transmis sion systems DESCRIPTION X9470 TYPICA L APPLICATION INC/DEC A2 A1 A0 in ar y In fo VOUT The Xicor X9470 RF PA Bias Controller contains.

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Preliminary Information
RF Power Amplifier (PA) Bias Controller
X9470
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
— IDQ Sensing and Tracking
—Programmable Instrumentation Amplifier to
Scale Wide Range of IDQ
—Programmable Gate Bias Driver
—All Programmable settings are Nonvolatile
—All Settings Recalled at Power Up.
• 28V Maximum VDD
• 2 Wire Interface for Programming Bias Setting
and Optimizing IDQ 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
DESCRIPTION
The Xicor 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
amplified by an instrumentation amplifier and the out-
put of the amplifier along with an external reference
voltage is fed to the inputs of a comparator. The com-
parator output indicates which direction the LDMOS
gate bias voltage 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 current can be maintained constant over
temperature and aging changes by periodic calibra-
tion. The VOUT pin can be used to monitor the aver-
age power by tracking the drain current. Up to eight
X9470 or additional Xicor Digital Potentiometers can
be controlled via a two-wire serial bus.
TYPICAL APPLICATION
INC/DEC
RWREF RHREF RLREF AGND VOUT V+
VDD
A2 RREF
A1 VREF
Comparator
A0
VP
Instrumentation
Amplifier
VSENSE+
CBULK
V VSENSE– RSENSE
SDA
SCL
I2C
interface
Control &
Status Registers
EEPROM
VCC VSS
Vbias
control
VREF
control
RBIAS
+
CS RHBIAS RWBIAS RLBIAS SHDN
choke
VBIAS
FILTER
RF PA in
Matching
RF Impedance
Class A Example
RF
out
REV 11.16 3/20/03
www.xicor.com
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