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TRF3705
SLWS223A – AUGUST 2011 – REVISED OCTOBER 2011
www.ti.com
LO Input
The LO inputs can be driven either single-ended or differentially. There is no significant performance difference
between either option with the exception of the sideband suppression. If driven single-ended, either input can be
used, but LOP (pin 3) is recommended for best broadband performance of sideband suppression. When driving
in single-ended configuration, simply ac-couple the unused port and terminate in 50 Ω . The comparison of the
sideband suppression performance is shown in Figure 66 for driving the LO single-ended from either pin and for
driving the LO input differentially.
0
V CM = 0.25 V
V CC = 3.3 V
LO = 0 dBm
LOP_SE
LOM_SE
LO_Diff
?10
?20
?30
?40
?50
GC = Off
?60
0
500
1000
1500 2000 2500
3000
3500
4000
Frequency (MHz)
G067
Figure 66. Unadjusted Sideband Suppression (SBS) vs LO Drive Options
RF Output
The RF output must be ac-coupled and can drive a 50- Ω load. The suggested output match provides the best
broadband performance across the frequency range of the device. It is possible to modify the output match to
optimize performance within a selected band if needed. The optimized matching circuits are to match the RF
output impedances to 50 Ω .
Figure 67 shows a slightly better OIP3 performance at the frequency above 1850 MHz with an 0.2-pF matching
capacitor.
34
32
30
28
26
24
22
20
18
16
14
V CM = 0.25 V
V CC = 3.3 V
12
LO = 0 dBm
GC = Off
With 0.2 pF cap
Without 0.2 pF cap
10
0
500
1000
1500 2000 2500
3000
3500
4000
Frequency (MHz)
G068
Figure 67. OIP3 with and without a Shunt 0.2-pF Matching Capacitor at the RF Port
22
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