LDMOS RF Power-Amplifier Bias
Controller
Typical Operating Characteristics (continued)
(V CC = +5.0V, T A = +25°C, unless otherwise noted.)
1000
900
POTENTIOMETER 1 AND 2
WIPER RESISTANCE vs. WIPER VOLTAGE
1000
900
POTENTIOMETER 1 AND 2
WIPER RESISTANCE vs. TEMPERATURE
POTENTIOMETER END-TO-END RESISTANCE
vs. TEMPERATURE
200
150
800
700
600
500
400
300
200
800
700
600
500
400
300
200
100
50
0
-50
-100
R POT2 + R S2
R POT1 + R S1
100
0
H COM = 5.0V
100
0
H COM = 5V
WIPER VOLTAGE = 4V
-150
-200
0
1
2
3
4
5
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
WIPER VOLTAGE (V)
POTENTIOMETER LOW TERMINAL VOLTAGE
vs. TEMPERATURE
20
15
10
0.5
0.4
0.3
0.2
TEMPERATURE ( ° C)
V CC CONVERSION ERROR
vs. SUPPLY VOLTAGE
0.5
0.4
0.3
0.2
TEMPERATURE ( ° C)
VD CONVERSION ERROR
vs. INPUT VOLTAGE
5
0
-5
L1
0.1
0
-0.1
0.1
0
-0.1
-10
-15
L2
H COM = 5.0V
-0.2
-0.3
-0.4
DEFAULT V CC
CALIBRATION
-0.2
-0.3
-0.4
DEFAULT VD
CALIBRATION
-20
-0.5
-0.5
-40
-20
0
20
40
60
80
100
3.0
3.5
4.0
4.5
5.0
5.5
0
0.5
1.0
1.5
2.0
2.5
TEMPERATURE ( ° C)
ID1 CONVERSION ERROR
vs. INPUT VOLTAGE
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
SUPPLY VOLTAGE (V)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
INPUT VOLTAGE (V)
ID2 CONVERSION ERROR
vs. INPUT VOLTAGE
-0.3
-0.4
-0.5
DEFAULT ID1
CALIBRATION
-0.3
-0.4
-0.5
DEFAULT ID2
CALIBRATION
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.4
0.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
_____________________________________________________________________
7
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