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TRF3705
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SLWS223A – AUGUST 2011 – REVISED OCTOBER 2011
350-MHz Operation
A different matching circuit, as shown in Figure 68 , could also be applied to improve the performance for the
frequency from 300 MHz to 400 MHz.
PD
1
18
VCC
LO
Input
180 pF 40 nH
2.2 pF
GND
LOP
LOM
2
3
4
17
16
15
GND
RF OUT
GND
39 pF
RF
Output
18 pF
49.9 W
GND
GC
5
6
14
13
GND
GND
Figure 68. Matching Components for Operation Centered at 350 MHz
Figure 69 and Figure 70 show a slight improvement in OIP3 performance at frequencies above 1850 MHz with
an 0.2-pF matching capacitor.
4
40
T A = ?40°C
T A = 25°C
V CM = 0.25 V
V CC = 3.3 V
T A = ?40°C
T A = 25°C
2
T A = 85°C
35
LO = 0 dBm
GC = Off
T A = 85°C
0
30
?2
25
?4
20
?6
?8
V CM = 0.25 V
V CC = 3.3 V
LO = 0 dBm
GC = Off
15
?10
200
250
300 350 400
450
500
10
200
250
300 350 400
450
500
Frequency (MHz)
G069
Figure 69. Output Power with 350-MHz Matching
Circuit
Frequency (MHz)
G070
Figure 70. OIP3 with 350-MHz Matching Circuit
Copyright ? 2011, Texas Instruments Incorporated
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