14
Table 5. Control scheme: 2-mode control
Power Mode Vref Vcont Vcc Power range
High Power Mode 2.85 Low 3.4 ~28 dBm
Low Power Mode 2.85 High 3.4 ~16 dBm
Shut Down Mode 0.00 – 3.4 –
Table 6. Control scheme: 3-mode control (DC-DC Converter Compatible)
Power Mode Vref Vcont Vcc Power range
High Power Mode 2.85 Low 3.4 ~28 dBm
Middle Power Mode 2.85 High 3.4 ~16 dBm
Low Power Mode 2.85 High 1.5 ~7 dBm
Shut Down Mode 0.00 – 3.4 –
Power control scheme
- 2-mode control scheme
This control scheme doesn’t
require DC-DC converter. Vcont
changes PA into Low Power
Mode or High Power Mode, which
results in 2-mode control with-
out DC-DC converter. WS2512 is
designed to change the mode at
16 dBm output power.
- 3-mode control scheme
This control scheme requires
DC-DC converter. When DC-DC
converter is used, Vcc voltage as
well as Vcont can be changed,
which results in 3-mode control
scheme - Low/Mid/High power
mode. Vcc changes at 7 dBm
output and Vcont changes at
16 dBm output. Voltages for Vcc
are 1.5V for low power mode and
3.4V(battery voltage) for mid and
high power mode.
PAE graphs for 2-mode control
and 3-mode control are shown in
Figure 28 and Figure 29.
HSDPA
WS2512 meets stringent HSDPA
linearity requirement up to
27 dBm. WS2512 can operate up
to 28.5 dBm with Rel.99, which
has a lower PAR (peak-to-average
ratio) than HSDPA.
Figure 28. PAE (2-mode control).
45
40
35
30
25
20
15
10
5
0
-10 -5
PAE (%)
Pout (dBm)
0 5 10 15 20 25 30
Figure 29. PAE (3-mode control).
45
40
35
30
25
20
15
10
5
0
-10 -5
PAE (%)
Pout (dBm)
0 5 10 15 20 25 30
