ML2731CT Просмотр технического описания (PDF) - Micro Linear Corporation

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ML2731CT

PA Bias Controller

Micro Linear Corporation 

PRELIMINARY

FUNCTIONAL DESCRIPTION

ML2731

VCC Supply

Voltage

PA Enable

signal (PAEN)

Baseband IC

PA on/off switch and

current sense

VPA

DAC

VCC

VCC

R1

Reference current

for PA control

OR

REXT

VREF

R2

PA Bias controller

Measure error

(wanted current

Vs actual current)

Increase gate

voltage to

increase PA

current

Negative

voltage

generator

Drain

VBIAS

Gate

bias

PA

(GaAs FET)

Source

GND

Figure 9: PA Current Control Loop Circuits

VPA Current vs. Vcontrol

600

500

400

300

200

100

0

0

0.5

1

1.5

2

2.5

3

V Control (V)

Figure 10: PA Current Control Loop Operation With REXT At

12kW and 24kW

January, 2000 PRELIMINARY DATASHEET

12KΩ

24KΩ

9

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