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參數(shù)資料
| 型號： | TQ5135 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 18/22頁 |
| 文件大小： | 261K |
| 代理商： | TQ5135 |
TQ5135
Data Sheet
18
For additional information and latest specifications, see our website:
www.triquint.com
IF
OUT
Vdd
Cshunt
Cseries
bypass
L
50
ohms
Figure 18: IF Output Match to 50 ohms
IF
OUT
Vdd
L1
C
opt
bypass
L2
IF
SAW
balanced
IF Out
Z1
Z2
C
saw
Equivalent
Circuit
Z1
Z2
L2
L1
C
saw
SAW
IF
C
L
L
F
≤
+
)
(
4
1
2
2
1
2
p
2
1
2
2
1
L
Z
Z
L
L
Figure 19: IF Match to a SAW Filter
6. Mxer RF Input Matching Network:
Although the TQ5135 can present <2:1 SWR to the SAW filter
without a matching circuit, it is still recommended to use an
inter-stage network. We have found that the Mxer-Filter
interaction discussed earlier can result in degraded OIP3 at
higher LO power levels with no network. Probably more time
will be needed for this phase of the design than for any other,
since it involves a process of trial-and-error.
It has been found experimentally that maximumIP3 for the
TQ5135 evaluation board occurs when the mxer input sees a
high impedance at the LO frequency. Since the SAW filter
looks like a short circuit at the LO frequency, the network
simply needs to add the correct amount of delay to rotate the
reflection coefficient around the Smth chart to near “open
circuit”. Either the circuit of Figure 20-A or 20-B will
accomplish this. On the evaluation board, we have found
network values that will accomplish this with no degradation at
the RF frequency.
Depending upon board layout and LO buffer tuning, it is
possible for the mxer RF input to have a poor match. In that
case, the circuit of Figure 20-C should be used. The matching
and delay can be accomplished with two components.
In either case, it is important that the SAW filter see a 2:1
SWR at the RF frequencies. Otherwise there will be
excessive ripple across the band.
SAW
SAW
SAW
RF In
TQ5135
LNA
14
2
RF In
TQ5135
LNA
14
2
RF In
TQ5135
LNA
14
2
TQ5135
Mixer
12
A
12
B
TQ5135
Mixer
12
C
TQ5135
Mixer
Figure 20: SAW-Mxer Input Networks
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