NXP Semiconductors MKW01Z128, Reference Manual

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System Considerations
MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc. 4-17
• Similar to the single-port configuration, generalized RF circuit topologies are shown for both the
TX and RX paths -
— The TX path network provides both impedance matching and low pass filtering for TX
harmonic trapping and out-of-band suppression
— The RX path network typically provides only impedance match between the antenna and the
transceiver RFIO and can normally be greatly simplified
— The topology for the RF matching networks can be used over the various bands of interest with
changes in component values. Not all indicated components are used at all frequencies.
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Figure 4-6. Dual Port RF Schematic (+17dBm to 1W)
4.6.4 Filter and Matching Network Component Values
The generalized filter/matching network shown in Figure 4-5 and Figure 4-6 must be evaluated and tuned
to its application use and frequency:
• Impedance matching is always required
• Only a transmission path typically uses any low pass filtering elements
• Not all indicated components are used at all frequencies
To provide an initial design configuration for several popular frequency bands, Table 4-5 lists component
values versus frequency and use for the generalized component topology of Figure 4-7 . For each
frequency, the filter components for the PA_BOOST output filter (Dual Port TX) and the Single Port
(TX/RX) are given.
RFIO_EXT
VDD
TX_OUT
ANT_TX TX_OUT
ANT_TX TX_OUT ANT_TX
AC Blocking Network
Optional External PA
C12 C12
C1 C1
C10 C10
L3 L3
C13 C13
C8 C8
C5 C5
L2 L2
External PA External PA
RF_IN
1
RF_OUT
2
C2 C2
C6 C6
L6 L6
1 2
L1 L1
C4 C4
C11 C11
Ant SW Ant SW
VDD
6
IN
5
VCONT
4
OUT1
1
OUT2
3
GND
2
C7 C7
C3 C3
MC13213 MC13213
RXTX
37
GND_PA2
38
VR_PA
42
PA_BOOST
41
RFIO
39
GND_PA1
40
C9 C9
L5 L5
1 2
A1
ANT
A1
ANT
L4 L4
1 2
L4 L4