TRF3705 Datasheet, PDF (23/37 Pages) Texas Instruments – 300-MHz to 4-GHz Quadrature Modulator

TRF3705
www.ti.com
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.
LO
Input
180 pF _{40 nH}
2.2 pF
1
PD
2
GND
3
LOP
4
LOM
49.9 W _GND ⁵
6
GC
18
VCC
17
GND
39 pF
16
RF_OUT
15
GND
14
GND
13
GND
RF
Output
18 pF
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
V_CM = 0.25 V
T_A = −40°C
T_A = 25°C
V_CC = 3.3 V
T_A = 25°C
2
T_A = 85°C
LO = 0 dBm
35 _{GC = Off}
T_A = 85°C
0
30
−2
25
−4
20
−6
V_CM = 0.25 V
−8
V_CC = 3.3 V
LO = 0 dBm
GC = Off
−10
200
250
300
350
400
450
500
Frequency (MHz)
G069
Figure 69. Output Power with 350-MHz Matching
Circuit
15
10
200
250
300
350
400
450
500
Frequency (MHz)
G070
Figure 70. OIP3 with 350-MHz Matching Circuit
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