METHOD AND APPARATUS FOR LOW INTERMODULATION DISTORTION AMPLIFICATION IN SELECTED BANDS
A method and apparatus for reducing intermodulation distortion is disclosed. In one embodiment, the method comprises the steps of accepting a sampled input signal V(t) wherein the input signal V(t) comprises a plurality of peaks; determining n peaks V p 1 ,V p 2 , . . . ,V p n of the sampled input s...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A method and apparatus for reducing intermodulation distortion is disclosed. In one embodiment, the method comprises the steps of accepting a sampled input signal V(t) wherein the input signal V(t) comprises a plurality of peaks; determining n peaks V
p
1
,V
p
2
, . . . ,V
p
n
of the sampled input signal V(t) exceeding a clip value V
clip
at times t
1
,t
2
, . . . ,t
n
; and modifying the sampled input signal V(t) by weighting the n peaks V
p
1
,V
p
2
, . . . ,V
p
n
exceeding the clip value V
clip
of the sampled input signal V(t) by a function b(t) wherein b(t) is either a hard limiting function or b(t)=ƒ(a
1
,a
2
, . . . a
n
;t-t
p
1
,t-t
p
2
, . . . t-t
p
n
), wherein a
1
,a
2
, . . . a
n
are weight values corresponding to the n peaks V
p
1
,V
p
2
, . . . ,V
p
n
, and ƒ(t-t
p
1
,t-t
p
2
, . . . t-t
p
n
) is a smooth shaping function. Intermodulation performance is then selectively improved in selected sub-bands by notch filtering prior to application to the non-linearity. |
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