ML2731CT Micro Linear, ML2731CT Datasheet - Page 9

• Manufacturer Part Number: ML2731CT
• Description: PA Bias Controller
• Manufacturer: Micro Linear

FUNCTIONAL DESCRIPTION
600
500
400
300
200
100
0
0
R2
R1
VCC
GND
0.5
Baseband IC
DAC
OR
Figure 10: PA Current Control Loop Operation With REXT At
VREF
Reference current
for PA control
REXT
1
Figure 9: PA Current Control Loop Circuits
VPA Current vs. Vcontrol
VCC Supply
Voltage
January, 2000
VCC
PRELIMINARY
V Control (V)
1.5
Vs actual current)
(wanted current
12k
Measure error
PA Enable
signal (PAEN)
and 24k
PA on/off switch and
current sense
PA Bias controller
PRELIMINARY DATASHEET
2
Increase gate
increase PA
voltage to
generator
Negative
current
voltage
2.5
VBIAS
VPA
Gate
bias
(GaAs FET)
3
PA
Drain
Source
ML2731
12K
24K
9