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Application Circuits
4.2
434 MHz Application
This application circuit was designed to provide NF = 2.3 dB, S21 gain > 27 dB for 434 MHz.
? Component C4 has the greatest impact on return losses, NF, and gain, by moving the input and
output on the Smith chart.
? Component L1 can be lowered to improve NF, by trading off S11 return loss.
? Gain, OIP3 and P1dBoutput can be increased, by decreasing the resistor at the output (without
impacting NF or return losses).
This application is intended for a range of designs, including TPMS, RKE, RF metering and key fob
designs using a battery.
Figure 17 is the 434 MHz application schematic with package pinouts and the circuit component topology.
Vcc
RF IN
C1
47 pF
L1
39 nH
1
6
Gnd
L2
33 nH
C2
100 pF
C3
.1uF
Gnd
2
5
R1
C4
RF
OUT
24 ohm
2.4 pF
NC
3
4
NC
Figure 17. 434 MHz Application Schematic
Typical performance that can be expected from this circuit at 2.7V is listed in Table 11 .
Table 11. Typical 434 MHz Evaluation Board Performance
Characteristic
Supply Current
RF Gain
Noise Figure
Symbol
I cc
G
NF
Min
—
26
—
Typ
4.7
27
2.3
Max
5.6
—
2.65
Unit
mA
dB
dB
434 MHz
( Figure 17 )
Vcc 2.7V
T A = 25 ° C
Output 3rd Order Intercept Point
Power Output at 1 dB Gain Compression
Input Return Loss
Small Signal Gain
Reverse Isolation
Output Return Loss
OIP3
P1 dBoutput
S11
S21
S12
S22
9.5
1
—
26
—
—
10.9
2.2
-15
27
-46
-19
—
—
-10
—
-45
-16
dBm
dBm
dB
dB
dB
dB
MBC13917 Advance Information, Rev. 1.0
Freescale Semiconductor
27
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