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| 型号： | TRF3705IRGET |
| 厂商： | Texas Instruments |
| 文件页数： | 22/37页 |
| 文件大小： | 0K |
| 描述： | IC QUADRATURE MODULATOR 24VQFN |
| 标准包装： | 250 |
| 功能： | 调制器 |
| LO 频率： | 300MHz ~ 4GHz |
| RF 频率： | 300MHz ~ 4GHz |
| P1dB： | 13.7dBm |
| 底噪： | -160dBm/Hz |
| 输出功率： | 7.1dBm |
| 电流 - 电源： | 306mA |
| 电源电压： | 3.15 V ~ 3.6 V |
| 测试频率： | 1.85GHz |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 其它名称： | 296-31995-2 TRF3705IRGET-ND |
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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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Product Folder Link(s): TRF3705
Copyright ? 2011, Texas Instruments Incorporated
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