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fo ? 9:0 ? = ----------------------------------------------------------------
Si4313-B1
complement of the positive offset number. The offset can be calculated with the following formula:
Desired Offset = 156.25 Hz ? ? hbsel + 1 ? ? fo ? 9:0 ?
Desired Offset
156.25 Hz ? ? hbsel + 1 ?
The adjustment range is ±160 kHz in high band and ±80 kHz in low band. For example, to compute an offset of
+50 kHz in high band mode, fo[9:0] should be set to 0A0h. For an offset of –50 kHz in high band mode, the fo[9:0]
register should be set to 360h.
Add
73
74
R/W
R/W
R/W
Func/Description
Frequency Offset
Frequency Offset
D7
fo[7]
Rsvd
D6
fo[6]
Rsvd
D5
fo[5]
Rsvd
D4
fo[4]
Rsvd
D3
fo[3]
Rsvd
D2
fo[2]
Rsvd
D1
fo[1]
fo[9]
D0
fo[0]
fo[8]
POR Def
00h
00h
3.5.3. Auto Frequency Control (AFC)
All AFC settings can be easily obtained from the excel settings calculator or by using the WDS Chip Configurator.
This is the recommended method to program all AFC settings. This section is intended to describe the operation of
the AFC in more detail to help understand the trade-offs of using AFC.The receiver supports automatic frequency
control (AFC) to compensate for frequency differences between the transmitter and receiver reference frequencies.
These differences can be caused by the absolute accuracy and temperature dependencies of the reference
crystals. Due to frequency offset compensation in the modem, the receiver is tolerant to frequency offsets up to
±0.25 times the IF bandwidth when the AFC is disabled. When the AFC is enabled, the received signal will be
centered in the pass-band of the IF filter, providing optimal sensitivity and selectivity over a wider range of
frequency offsets up to ±0.35 times the IF bandwidth. The trade-off of receiver sensitivity (at 1% PER) versus
carrier offset and the impact of AFC are illustrated in Figure 8.
Figure 8. Sensitivity at 1% PER vs. Carrier Frequency Offset
When AFC is enabled, the preamble length needs to be long enough to settle the AFC. In general, one byte of
preamble is sufficient to settle the AFC. Disabling the AFC allows the preamble to be shortened from 40 bits to 32
bits. Note that with the AFC disabled, the preamble length must still be long enough to settle the receiver and to
detect the preamble (see "6.2. Preamble Length" on page 30). The AFC corrects the detected frequency offset by
changing the frequency of the Fractional-N PLL. When the preamble is detected, the AFC will freeze for the
remainder of the packet. The AFC loop includes a bandwidth limiting mechanism improving the rejection of out of
band signals. When the AFC loop is enabled, its pull-in-range is determined by the bandwidth limiter value
Rev. 1.0
23
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