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CC11x1-Q1
SWRS076B – 11-07-22-013 - APRIL 2009 – REVISED APRIL 2010
See Design Note DN013 Programming Output Power on CC1101 (SWRA151) for recommended
PATABLE settings for various output levels and frequency bands. Using PA settings from 0x61 to 0x6F is
not recommended. See
See Design Note DN013 Programming Output Power on CC1101 (SWRA151) for output power and
current consumption for default PATABLE setting (0xC6). PATABLE must be programmed in burst mode
to write to entries other than PATABLE[0].
All content of the PATABLE, except for the first byte (index 0), is lost when entering the
SLEEP state.
3.21 Shaping and PA Ramping
With ASK modulation, up to eight power settings are used for shaping. The modulator contains a counter
that counts up when transmitting a one and down when transmitting a zero. The counter counts at a rate
equal to 8 times the symbol rate. The counter saturates at FREND0.PA_POWER and 0 respectively. This
counter value is used as an index for a lookup in the power table. Thus, to utilize the whole table,
FREND0.PA_POWER should be 7 when ASK is active. The shaping of the ASK signal is dependent on
the configuration of the PATABLE.
Figure 3-22
shows some examples of ASK shaping.
P A TA B LE [ 7]
P A TA B LE [ 6]
P A TA B LE [ 5]
P A TA B LE [ 4]
P A TA B LE [ 3]
P A TA B LE [ 2]
P A TA B LE [ 1]
P A TA B LE [ 0]
54
Detailed Description
Section 3.6.6
for PATABLE programming details.
PATABLE(7)[7:0]
PATABLE(6)[7:0]
PATABLE(5)[7:0]
PATABLE(4)[7:0]
PATABLE(3)[7:0]
PATABLE(2)[7:0]
PATABLE(1)[7:0]
PATABLE(0)[7:0]
Index into PATABLE(7:0)
PA_POWER[2:0]
in FREND0 register
Figure 3-21. PA_POWER and PATABLE
Output P ower
1
0
0
FRE ND0.P A_P OWE R = 3
FRE ND0.P A_P OWE R = 7
Figure 3-22. Shaping of ASK Signal
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NOTE
The PA uses this
setting.
Settings 0 to PA_POWER are
used during ramp-up at start of
transmission and ramp-down at
end of transmission, and for
ASK/OOK modulation.
The SmartRF® Studio software
e.g 6
should be used to obtain optimum
PATABLE settings for various
output powers.
1
0
1
1
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