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ML2731CT Datenblatt(Datasheet) 9 Page - Micro Linear Corporation

Teile-Nr. ML2731CT
Beschreibung  PA Bias Controller
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Hersteller  MICRO-LINEAR [Micro Linear Corporation]
Homepage  http://www.microlinear.com
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 9 page
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ML2731
9
January, 2000
PRELIMINARY DATASHEET
PRELIMINARY
Figure 9: PA Current Control Loop Circuits
Figure 10: PA Current Control Loop Operation With REXT At
12k
W and 24kW
FUNCTIONAL DESCRIPTION
Measure error
(wanted current
Vs actual current)
Negative
voltage
generator
VBIAS
Reference current
for PA control
PA Enable
signal (PAEN)
VPA
PA
(GaAs FET)
PA on/off switch and
current sense
Drain
Source
Gate
bias
Increase gate
voltage to
increase PA
current
VCC Supply
Voltage
Baseband IC
DAC
OR
R1
VCC
GND
PA Bias controller
R2
REXT
VREF
VCC
0
100
200
300
400
500
600
VPA Current vs. Vcontrol
0
0.5
1
1.5
2
2.5
3
V Control (V)
12K
24K




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