WS1105 データシートの表示（PDF） - Avago Technologies
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WS1105 Datasheet PDF : 15 Pages
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Calibration
Calibration procedure is shown in Figure 11. Two cali- TX
bration tables, high mode and low mode respectively,
are required for Cool PAM, which is due to gain differ-
ence in each mode. For continuous output power at the
mode change points, the input power should be adjusted AGC Low
according to gain step during the mode change.
High
Offset value
(Difference between rising point and falling point)
Offset value, which is the difference between the rising
point (output power where PA mode changes from low
mode to high mode) and falling point (output power
where PA mode changes from high mode to low mode),
should be adopted to prevent system oscillation. 3 to 5 dB
is recommended for hysteresis.
mode
mode
Min
Falling Rising
Figure 11.Calibration procedure
Gain
Pou
Max
Average current & Talk time
Probability Distribution Function implies that what is
important for longer talk time is the efficiency of low or
medium power range rather than the efficiency at full
power. WS1105 idle current is 13mA and operating current
at 16dBm is 65mA at nominal condition. This PA with low
current consumption prolongs talk time by no less than
30 minutes compared to other PAs
Average current = ³ (PDF x Current)dp
High
Low
Mode
Mode
Pou
Falling
Rising
Figure 12. Setting of offset between rising and falling power
5.00
4.50
CDG Urban
4.00
CDG Suburban
3.50
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-50 -40 -30 -20 -10 0 10
PA Out(dBm)
Conv.
Digitally controlled PAM
Figure 13. CDMA Power Distribution Function
700
600
500
400
300
200
100
0
20 30
Cool PAM
8
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