參數資料
型號: X9470
廠商: Intersil Corporation
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: 18/25頁
文件大?。?/td> 542K
代理商: X9470
PeimnayInomaion
18 of 25
REV 11.16 3/20/03
www.xicor.com
Preliminary Information
X9470
Figure 6. Dynamic Biasing Technique: Automatic DC Bias Operating Point Adjustment
State 0
Monitor
Mode
State 1
Calibration
(no RF present)
State 2
RF present
State 3
Recalibrate bias
point for drift
and temperature
State 4
shut
down
Set Operating Range Scale for Bias Adjustment
RF signal
V
REF
CS
SCL
INC/DEC
SHDN
V
BIAS
1
2
3
4
5
6
R
default is
zero point of R
total
Latch R
DC point
in calibration vs V
REF
RF present
Turn off
Bias
Adjustment
R
bias
increase/decrease
after RF present due to
temperature increase &
V
GS
-threshold drift
IDQ vs. gate
voltage bias
optimized
Shut
down
BiasLock
Saves wiper position to
volatile memory
Bias Adjustment ON
Bias Adjustment OFF
Bias Adjustment ON
Automatic Bias Adjustment
BiasLock
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