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參數(shù)資料
| 型號： | CC113LRTKT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC20 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, VQFN-20 |
| 文件頁數(shù)： | 19/75頁 |
| 文件大?。?/td> | 1454K |
| 代理商： | CC113LRTKT |
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CC113L
SWRS108A
Page 26 of 68
E
CHANBW
XOSC
channel
M
CHANBW
f
BW
_
2
)
_
4
(
8
Table 18 lists the channel filter bandwidths
supported by the CC113L.
MDMCFG4.
CHANBW_M
MDMCFG4.CHANBW_E
00
01
10
11
00
812
406
203
102
01
650
325
162
81
10
541
270
135
68
11
464
232
116
58
Table 18: Channel Filter Bandwidths [kHz]
(assuming a 26 MHz crystal)
For
best
performance,
the
channel
filter
bandwidth should be selected so that the
signal bandwidth occupies at most 80% of the
channel filter bandwidth. The channel centre
tolerance due to crystal inaccuracy should also
be
subtracted
from
the
channel
filter
bandwidth. The following example illustrates
this:
With the channel filter bandwidth set to
500 kHz, the signal should stay within 80% of
500
kHz,
which
is
400
kHz.
Assuming
915 MHz frequency and ±20 ppm frequency
uncertainty for both the transmitting device and
the receiving device, the total frequency
uncertainty is ±40 ppm of 915 MHz, which is
±37 kHz. If the whole transmitted signal
bandwidth is to be received within 400 kHz,
the transmitted signal bandwidth should be
maximum 400 kHz - 237 kHz, which is
326 kHz.
By
compensating
for
a
frequency
offset
between the transmitter and the receiver, the
filter bandwidth can be reduced and the
sensitivity can be improved, see more in
14 Demodulator, Symbol Synchronizer, and Data Decision
CC113L contains an advanced and highly
configurable demodulator. Channel filtering
and
frequency
offset
compensation
is
performed digitally. To generate the RSSI level
(see Section 17.2 for more information), the
signal level in the channel is estimated. Data
filtering
is
also
included
for
enhanced
performance.
14.1 Frequency Offset Compensation
The
CC113L has a very fine frequency
resolution (see Table 9). This feature can be
used to compensate for frequency offset and
drift.
When
using
2-FSK,
GFSK,
or
4-FSK
modulation, the demodulator will compensate
for the offset between the transmitter and
receiver frequency within certain limits, by
estimating the centre of the received data. The
frequency offset compensation configuration is
controlled
from
the
FOCCFG register. By
compensating for a large frequency offset
between the transmitter and the receiver, the
sensitivity can be improved, see DN005 [9].
The
tracking
range
of
the
algorithm
is
selectable
as
fractions
of
the
channel
bandwidth
with
the
configuration register.
If the FOCCFG.FOC_BS_CS_GATE bit is set,
the offset compensator will freeze until carrier
sense asserts. This may be useful when the
radio is in RX for long periods with no traffic,
since the algorithm may drift to the boundaries
when trying to track noise.
The tracking loop has two gain factors, which
affects the settling time and noise sensitivity of
the algorithm. FOCCFG.FOC_PRE_K sets the
gain before the sync word is detected, and
FOCCFG.FOC_POST_K selects the gain after
the sync word has been found.
The
estimated
frequency
offset
value
is
available in the FREQEST status register. This
can be used for permanent frequency offset
compensation. By writing the value from
the
frequency synthesizer will automatically be
adjusted according to the estimated frequency
offset. More details regarding this permanent
frequency compensation algorithm can be
found in DN015 [6].
Note: Frequency offset compensation is
not supported for OOK modulation
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