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Micrel
MICRF506
FEE
A6..A0
0010101
0010110
D7
-
FEE_7
D6
-
FEE_6
D5
-
FEE_5
D4
-
FEE_4
D3
FEEC_3
FEE_3
D2
FEEC_2
FEE_2
D1
FEEC_1
FEE_1
D0
FEEC_0
FEE_0
where FEE is the value stored in the FEE register,
(Fp is the single sided frequency deviation, P is the
number of symbols/data bit counted and R is the
symbol/data rate. A positive Foffset means that the
received signal has a higher frequency than the
The Frequency Error Estimator (FEE) uses
information from the demodulator to calculate the
frequency offset between it’s receive frequency and
the transmitter frequency. The output of the FEE can
be used to tune the XCO frequency, both for
production calibration and for compensation for
crystal temperature drift and aging.
The inputs to the FEE circuit are the up and down
pulses from the demodulator. Every time a ‘1’ is
updated, an UP-pulse is coming out of the
demodulator, and the same with the DN-pulse every
time the ‘0’ is updated. The expected number of
pulses for every received symbol is 2 times the
modulation index ( ? ).
The FEE can operate in three different modes;
counting only UP-pulses, only DN-pulses or counting
UP+DN pulses. The number of received symbols to
be counted is either 8, 16, 32 or 64. This is set by
the FEEC_0…FEEC_3 control bit, as follows:
receiver frequency. To compensate for this, the
receivers XCO frequency should be increased (see
ANNEX A) on how to tune the XCO frequency based
on the FEE value).
It is recommended to use Mode UP+DN for two
reasons, you do not need to know the actual
frequency deviation and this mode gives the best
accuracy.
FEEC_1
0
0
1
1
FEEC_3
0
0
1
1
FEEC_0
0
1
0
1
FEEC_2
0
1
0
1
FEE Mode
Off
Counting UP pulses
Counting DN pulses
Counting UP and DN pulses. UP increments
the counter, DN decrements it.
No. of symbols used for the measurement
8
16
32
65
Table 10. FEEC Control Bit
The result of the measurement is the FEE value, this
can be read from register with address 0010110b.
Negative values are stored as a binary no between
0000000 and 1111111. To calculate the negative
value, a two’s complement of this value must be
performed. Only FEE modes where DN-pulses are
counted (10 and 11) will give a negative value.
When the FEE value has been read, the frequency
offset can be calculated as follows:
Mode UP: Foffset = R/(2P)x(FEE- ? Fp)
Mode DN: Foffset = R/(2P)x(FEE+ ? Fp)
Mode UP+DN: Foffset = R/(4P)x(FEE)
July 2006
22
M9999-092904
+1 408-944-0800
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