TQ3131 데이터 시트보기 (PDF) - TriQuint Semiconductor
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TQ3131 Datasheet PDF : 16 Pages
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TQ3131
Data Sheet
Gamma Opt analysis for TQ3131 Amps Mode
Freq (MHz) Γ Opt
700
0.61
880
0.70
1000
0.56
Γ Angle
40.6
54.2
56.6
Fmin (dB) R noise
1.22
33.0
1.09
27.4
1.42
27.0
Figure 2 shows how a spiral pc board trace can be used as the
external inductance. It is suggested that such a circuit be used
for the initial design prototype. Then the optimum inductance
can be found by simply solder bridging across the inductor. The
final pc board design can then include the proper shorted
version of the inductor.
Gain Control via Pin 4 Inductance
The source connection of the LNA cascode is brought out
separately through pin 4. That allows the designer to make
some range of gain adjustment. The total amount of inductance
present at the source of the cascode is equal to the bond wire
plus package plus external inductance. One should generally
use an external inductance such that gain in the high gain
CDMA mode = 13.0. Although it is possible to increase the gain
of the TQ3131 by using little or no degeneration, input intercept
will be degraded.
Figure 2 Showing Lbrd and Grounding on
Evaluation Board
8
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