LMV225SDX Datasheet, PDF (28/30 Pages) Texas Instruments – LMV225/LMV226/LMV228 RF Power Detector for CDMA and WCDMA

LMV225, LMV226, LMV228
SNWS013L – AUGUST 2003 – REVISED MARCH 2013
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The maximum error for this approximation occurs at the geometric mean of a gain section, which is e.g. for the
third segment:
E_K E_K E_K
A²
· _A1
=
A
A
(10)
The size of the error increases with distance between the thresholds.
LAYOUT CONSIDERATIONS
For a proper functioning part a good board layout is necessary. Special care should be taken for the series
resistance R₁ (Figure 66) that determines the attenuation. For high resistor values the parasitic capacitance of
the resistor may significantly impact the realized attenuation. The effective attenuation will be lower than
intended. To reduce the parasitic capacitance across resistor R₁, this resistor can be composed of several
components in series instead of using a single component.
28
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