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參數(shù)資料

TQ5135

Data Sheet

For additional information and latest specifications, see our website:

www.triquint.com

Figure 14: Suggested LO Tuning Response

A first approximation to the needed inductor can be found by

the following equation:

L = ---------------- - 1nH where C=1.5pF

C (2*pi*F)

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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