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參數(shù)資料
| 型號： | X9470V24I |
| 廠商： | INTERSIL CORP |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | RF Power Amplifier (PA) Bias Controller |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 1/25頁 |
| 文件大?。?/td> | 542K |
| 代理商： | X9470V24I |
–
Control &
Status Registers
REV 11.16 3/20/03
1 of 25
www.xicor.com
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
— I
DQ
Sensing and Tracking
—Programmable Instrumentation Amplifier to
Scale Wide Range of I
—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
DQ
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
A0
A2
VCC
VSS
V+
AGND
Comparator
choke
RF PA in
R
SENSE
V
DD
V
REF
V
SENSE+
V
BIAS
INC/DEC
Instrumentation
Amplifier
V
CS
V
OUT
V
SENSE–
R
REF
RW
REF
RL
REF
SHDN
+
EEPROM
SCL
SDA
A1
Vbias
control
VREF
control
I2C
interface
RF
out
RH
REF
R
BIAS
VP
RH
BIAS
RL
BIAS
RW
BIAS
FILTER
V
B
RF Impedance
Matching
C
BULK
Class A Example
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