Method and apparatus for low intermodulation distortion amplification in selected bands
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 26, 2005
Grant Date -
Nov 25, 2004
app pub date -
May 21, 2003
filing date -
May 21, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
|
US Family Size
|
Non-US Coverage
|
Patent Longevity
|
Forward Citations
|
Abstract
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 Vp1,Vp2, . . . Vpn of the sampled input signal V(t) exceeding a clip value Vclip at times t1, t2, . . . tn; and modifying the sampled input signal V(t) by weighting the n peaks Vp1,Vp2, . . . ,Vpn exceeding the clip value Vclip of the sampled input signal V(t) by a function b(t) wherein b(t) is either a hard limiting function or b(t)=f(a1, a2, . . . an;t-;tp1,t-;tp2, . . . t-;tpn), wherein a1,a2, . . . an are weight values corresponding to the n peaks Vp1, Vp2, . . . Vpn, and f(t-;tp1,t-;tp2, . . . t-;tpn) 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.
First Claim
Other Claims data not available
Family
- No Family data available.
International Classification(s)
- 2003 Application Filing Year
- H03F Class
- 793 Applications Filed
- 440 Patents Issued To-Date
- 55.49 % Issued To-Date
