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Sub 1 GHz Transceiver Architecture Description
MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
5-13
In the lower bands of operation (290 to 510 MHz), the multi-phase mixing architecture with weighted
phases improves the rejection of the LO harmonics in receiver mode, hence increasing the receiver
immunity to out-of-band interferers.
The I and Q digitalization is made by two 5
th
order continuous-time Sigma-Delta Analog to Digital
Converters (ADC). Their gain is not constant over temperature, but the whole receiver is calibrated before
reception, so that this inaccuracy has no impact on the RSSI precision. The ADC output is one bit per
channel. It needs to be decimated and filtered afterwards. This ADC can also be used for temperature
measurement; please refer to
Section 5.7.16, “Temperature Sensor”
for more details.
The decimators decrease the sample rate of the incoming signal in order to optimize the area and power
consumption of the following receiver blocks.
5.7.5
Channel Filter
The role of the channel filter is to filter out the noise and interferers outside of the channel. Channel
filtering on the transceiver is implemented with a 16-tap Finite Impulse Response (FIR) filter, providing
an outstanding Adjacent Channel Rejection performance, even for narrowband applications.
NOTE
To respect oversampling rules in the decimation chain of the receiver, the
Bit Rate cannot be set to a value higher than 2 times the single-side receiver
bandwidth (BitRate < 2 * RxBw)
The single-side channel filter bandwidth RxBw is controlled by the parameters RxBwMant and RxBwExp
in RegRxBw:
•
When FSK modulation is enabled:
•
When OOK modulation is enabled:
NOTE
The following channel filter bandwidths are accessible (oscillator is mandated at 32 MHz):
Table 5-5. Available RxBw Settings
RxBwMant
(binary/value)
RxBwExp
(decimal)
RxBw (kHz)
FSK
ModulationType=00
OOK
ModulationType=01
10b / 24
7
2.6
1.3
01b / 20
7
3.1
1.6
00b / 16
7
3.9
2.0
RxBw
FXOSC
RxBwMant
2
RxBwExp
2
+
--------------------------------------------------------------------
=
RxBw
FXOSC
RxBwMant
2
RxBwExp
3
+
--------------------------------------------------------------------
=
Содержание MKW01Z128
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