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ML2731 Arkusz danych(PDF) 9 Page - Micro Linear Corporation

Numer części ML2731
Szczegółowy opis  PA Bias Controller
PDF  12 Pages
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Producent  MICRO-LINEAR [Micro Linear Corporation]
Strona internetowa  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML2731 Arkusz danych(HTML) 9 Page - Micro Linear Corporation

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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
Ω
24K
Ω



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