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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)： | 15/22頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TQ5135 |
TQ5135
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
15
Figure 14: Suggested LO Tuning Response
A first approximation to the needed inductor can be found by
the following equation:
1
L = ---------------- - 1nH where C=1.5pF
C (2*pi*F)
2
It is likely that when the design is prototyped, the needed
inductance will fall between two standard inductor values. It is
advised to use a slightly larger inductor and then use the
bypass capacitor for fine tuning. When using this method it is
important to isolate the tuning inductor/bypass cap node from
the Vdd bus, since loading on the bus can affect tuning. A
resistor of 3.3ohmto 20ohmhas been found to work well for
this purpose (R2).
Figure 14 shows the recommended test setup for tuning the
TQ5135 LO buffer. A network analyzer is set to the center of
the LO band +/- 300Mhz, with an output power of –4dBm It is
important to set the frequency range to be quite a bit wider
than the LO band, so that the shape of the tuning curve can
be seen. A two port calibration is performed and the analyzer
is set to monitor S21. Port 1 of the analyzer is connected to
the LO port of the TQ5135, while Port 2 is connected via cable
to a short length of sem-rigid coaxial probe. The center of the
probe should protrude 1 to 2 mmbeyond the ground shield.
The end of the probe with the exposed center conductor is
held close to the LO tuning inductor.
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