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Output Power Measurement
11
Output Power Measurement
The RF output levels given in Section 9, “Electrical Characteristics ,” are measured with a 50 Ω load directly connected to the
RFOUT pin, as shown below in Figure 9 . This wideband coupling method gives results independent of the application.
VCC
Impeder: TDK MMZ1608Y102CTA00
RFOUT
RF output
100 pF
R L = 50 W
Figure 9. Output Power Measurement Configurations
The configuration shown in Figure 10 (a) provides better efficiency in terms of output power and harmonics rejection. The
schematic on Figure 10 (b) gives the equivalent circuit of the RFOUT pin and the DC bias impeder as well as matching network
components for 434 MHz frequency band.
VCC
Impeder: TDK MMZ1608Y102CTA00
(a)
RFOUT
Matching
Network
RF output
R L =50 Ω
Matching
Network
(b)
C 0 R 0
1.5 pF 250 Ω
RFOUT pin
L 1
39 nH
3 k Ω
R i
Impeder
C 3
330pF
R L
Load
50 Ω
Figure 10. Output Model and Matching Network for 434 MHz Band
PLL Tuned UHF Transmitter for Data Transfer Applications, Rev. 1.7
Freescale Semiconductor
13
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