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參數(shù)資料
| 型號： | TQ5M34 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 207K |
| 代理商： | TQ5M34 |
TQ5M34
Data Sheet
14
For additional information and latest specifications, see our website:
www.triquint.com
For purposes of 50 Ohmevaluation, the shunt L, series C,
shunt C circuit shown in Figure 7 is the simplest and requires
the fewest components. DC current can be easily injected
through the shunt inductor and the series C provides a DC
block, if needed. The shunt C, in particular can be used to
improve the return loss and to reduce the LO leakage. The
circuit is used on our evaluation board.
For matching into a filter, the circuit of Figure 8 works well.
The network provides the needed impedance transformation
with a lower loaded Q using reasonable inductor values.
Thus matching circuit loss is mnimzed. The ratio between
(L1+L2) and L2 is proportional to the square root of the
impedances to be matched, Z1 and Z2. The sumof L1 and
L2 must be chosen so that the total inductance resonates with
the SAW input capacitance. If this resonant frequency is
much higher than the IF frequency, then Copt can be added to
lower it. Please note that because of parasitic capacitance
and the discrete values of commercial inductors, the formulas
of Figure 8 only serve as a starting point for experimentation.
In order to mnimze loss, any inductors used should have high
Q. Typically 0805 size inductors performbetter than the 0603
size. If 0603 inductors must be used for space
considerations, make certain to use High-Q types. It is
possible to introduce 3dB of additional loss by using low Q
inductors. Additionally, it is recommended to place the IF filter
very close to the TQ5M34. If the two are far apart a
transmssion line will be needed between them In that case
two matching networks will be needed, one to match down to
50ohms and one to match back up to 1000ohms. Twice the
loss can be expected for such a scheme.
RF INPUT MATCHING NETWORK:
Unlike the TQ5M31, the TQ5M34 requires an RF input
matching network on all bands. Although the RF Input
matching network is used to present a < 2:1 SWR to the
IF
OUT
Vdd
Cshunt
Cseries
bypass
L
Z load
Figure 7: Match into Low-Z Load
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 8: Match into SAW Filter
image filter, it has another important function. It is used to
“tame” the Mxer-Filter interaction discussed earlier.
For synthesizing a TQ5M34 input match the recommended
procedure is to use the network topology of Figure 9-C and
adjust the component values until input return loss is > 10dB.
The evaluation board component values can be used as a
starting point. Alternatively, the S-parameters can be
measured and a match synthesized with a Smth Chart tool. It
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