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參數(shù)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(shù)： | 13/25頁 |
| 文件大小： | 542K |
| 代理商： | X9470 |
device is selected and enabled to respond to the INC/
DEC and SCL inputs. HIGH to LOW transitions on SCL
will increment or decrement R
BIAS
(depending on the
state of the INC/DEC input). The INC/DEC input is
derived from the output of the comparator of the Sense
and Scale Block.
13 of 25
REV 11.16 3/20/03
www.xicor.com
Preliminary Information
X9470
Figure 2. Sense and Scale Block Diagram
The wiper of the digital potentiometer acts like its
mechanical equivalent and does not move beyond the
last position. That is, the counter does not wrap around
when clocked to either extreme. The electronic
switches in the potentiometer operate in a “make
before break” mode when the wiper changes tap posi-
tions. If the wiper is moved several positions, multiple
taps are connected to the wiper for t
IW
(SCL to
RW
BIAS
change).
When the device is powered-up, the X9470 will load
the last saved value from the non-volatile memory into
the WCR. Note that the current wiper position can be
saved into non-volatile memory register by using the
SCL and CS pins as shown in Figure 4.
Important note: the factory setting of the wiper counter
register is the ZERO-position (0 of 255 taps). This is
the default wiper position.
Bias Adjustment Block Instructions and Program-
ming.
The SCL, INC/DEC (internal signal) and CS
inputs control the movement of the wiper along the
resistor array. (See Table 1) With CS set HIGH, the
Storing Bias Resistor Values in Memory.
Wiper val-
ues are stored to VOLATILE memory automatically
when CS is HIGH and INC/DEC either transitions from
HIGH to LOW or from LOW to HIGH. Wiper values are
stored to NON-VOLATILE memory during Byte Write
or as described in the following section.
Table 1. Mode Selection
* When coming out of shutdown, the CS pin must be cycled once before bias
adjustment is enabled.
INC/DEC
RW
REF
RL
REF
RH
REF
V
OUT
V
DD
V
SENSE+
R
SENSE
V
SENSE–
10k
64-tap
V
REF
Comparator
INC/DEC
~1kohm
Precision
I-Amp
Cint~2pF ±10%
}
V
I
DQ
RF
PA
Out
choke
V
gate
RF PA in
K
2
= 20X
K
1
= 50X
SDA
H
CS*
H
SCL
INC /
DEC
H
Mode
VBIAS is incremented
one tap position.
VBIAS is decremented
one tap position.
Lock Wiper Position.
Save to volatile
memory. (BiasLock)
Open Loop.
H
H
L
H
H
X
X
L
X
X
or
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