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參數(shù)資料
| 型號： | X9470V24I |
| 英文描述： | RF Power Amplifier (PA) Bias Controller |
| 中文描述： | 射頻功率放大器（PA）的偏置控制器 |
| 文件頁數(shù)： | 17/25頁 |
| 文件大?。?/td> | 542K |
| 代理商： | X9470V24I |
17 of 25
REV 11.16 3/20/03
www.xicor.com
Preliminary Information
X9470
State 3: PA Standby Mode, DC Bias Adjustment
[Compensation for V
GS
Drift and Temperature
Variation]
When the Power Amplifier is in Standby Mode the
X9470 allows for dynamic adjustment of the DC bias-
ing point to take into account both V
GS
drift and tem-
perature variation. Dynamic biasing is achieved with
the X9470 by using the CS, and SCL pins. For exam-
ple, the SCL pin can be a steady clock and the CS pin
can be used as a control signal to enable/disable the
Bias Adjustment Block.
Figure 6 illustrates how the X9470 can be used for
dynamic biasing. Upon the presence of an RF signal,
the CS pin is pulled LOW. This will prevent the X9470
from changing the V
BIAS
voltage during I
DQ
peak cur-
rents. Once the RF signal is no longer present, the CS
pin can be enabled (closed loop), SDA high and the
X9470 Bias Adjustment Circuit moves the V
BIAS
volt-
age (the gate voltage of the FET) to meet the average
I
DQ
bias point for optimum amplifier performance.
State 4: Power Off Mode
During power saving or power-off modes the X9470
can be shut down via the SHDN pin. This pin pulls the
output of the V
BIAS
pin LOW.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| X9470 | RF Power Amplifier (PA) Bias Controller |
| X9470V24I | RF Power Amplifier (PA) Bias Controller |
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