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ML2731 Arkusz danych(PDF) 10 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) 10 Page - Micro Linear Corporation

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ML2731
10
January, 2000
PRELIMINARY DATASHEET
PRELIMINARY
VNEG
PAEN
PDN
VBIAS Voltage
VPAout current
VControl Voltage
0V
3V
0V
-3V
Current
Charge VNEG
caps
discharge VNEG
caps
Timeconstant set by
external caps on VBIAS
>0
µsec
>200
µs
>0
µsec
>0
µsec
Timeconstant set by
external caps on VPA
-7
-6
-5
-4
-3
-2
-1
0
1
10
100
100
Frequency(KHz)
3.3nF
2.2nF
1.5nF
0
20
40
60
80
100
120
140
160
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
5
10
15
20
Time (
µsec)
VREF
VPA Current
RECOMMENDED PA BIAS OPERATION
An example of how the PA bias operates is shown in Figure
11. A three-step reference voltage ramp is generated using
an external baseband circuit and is applied to the ICON
pin via an external resistor. The ML2731 current control
loop uses this input as a reference to set the PA current and
therefore generates a current ramp output (and hence PA
power ramp output.) The rate of change of negative bias
and PA current is determined by the capacitance on the
VBIAS pin and on the VPA pin. Note sufficient time should
be allowed for the negative voltage generator to reach a
steady state, prior to enabling the PA.
Figure 11: PA Bias Control Loop Operation
Figure 12: VPA output vs VREF (TRANSMIT mode, REXT = 12k
W,
capacitance on VBIAS = 3.3nF)
Figure 13: Bandwidth of PA Current control loop for 3.3nF,
2.2nF and 1.5nF VBIAS capacitance
FUNCTIONAL DESCRIPTION
Where ICON is a fixed value (i.e. the VPA current is not
ramped up and down by changing the value of ICON)
then the time taken for the VPA current to ramp up
following PAEN being enabled is determined by the
capacitor values on VBIAS and VPA. The time taken for
the current to ramp down following PAEN being disabled
is determined by the capacitance value on VPA only.
Example timings are:
1
msec ramp-up for 2nF VBIAS capacitance
4
msec ramp-up for 22nF VBIAS capacitance
An example of a 3 step current ramp up and ramp down,
with 3.3nF capacitance on VBIAS, is shown in Figure 12.



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