Apparatus, methods and articles of manufacture for digital modification in electromagnetic signal processing

• US 6,924,699 B2
• Filed: 03/06/2003
• Issued: 08/02/2005
• Est. Priority Date: 03/06/2003
• Status: Expired due to Term

• Current Assignee: NETGEAR, Inc.
• Original Assignee: M/A Com, Inc. (MACOM Technology Solutions Holdings, Inc.)
• Inventors: Ahmed, Walid K. M.
• Primary Examiner(s): Choe, Henry
• Application Number:
  US10/382,684
• Publication Number:
  US 20040183635A1
• Time in Patent Office: 880 Days
• Field of Search: 330/2, 330/149, 330/129, 330/254, 375/297, 455/63
• US Class Current: 330/149
• CPC Class Codes: G06J 1/00 Hybrid computing arrangements digitally-programmed analogue computers G06G7/06

Abstract

Apparatus, methods and articles of manufacture are disclosed for digital signal modification. Various wave characteristics of an electromagnetic wave may be modified according to desired values. Those values are provided to one or more current sources, wherein the output values of the current sources are modified accordingly.

Claims

1. A method for electromagnetic processing comprising:

modifying a wave characteristic with a predetermined value, wherein said predetermined value is derived from a predetermined output of at least two independently controllable current sources; and

implementing said predetermined output via a signal modifier,

wherein said signal modifier comprises a Look Up Table.

2. A method for signal processing comprising:

deriving a wave characteristic from an electromagnetic wave;

modifying said wave characteristic based upon a predetermined value;

providing said modified wave characteristic to at least one amplifier which is also regulated by said modified wave characteristic so as to produce an output, wherein said predetermined value is derived through a desired output of said amplifier; and

,

implementing said predetermined value via a signal modifier,

wherein said signal modifier comprises a Look Up Table.

3. A method of providing linearity in a non-linear system, wherein said non linear system comprises at least two current sources, said method comprising the steps of:

determining any potential non linear output of said at least two current sources;

modifying said non linear output via a signal modifier;

wherein said modification provides a linearity to said potential non linear said current sources, and

wherein said signal modifier comprises a Look Up Table.

4. An apparatus for electromagnetic processing comprising:

means for modifying at least one wave characteristic with a predetermined value, wherein said predetermined value is derived from a predetermined output of at least two independently controllable current sources,

wherein said predetermined output is implemented via a signal modifier and wherein said signal modifier comprises a Look Up Table.

5. An apparatus for digital signal processing comprising:

means for deriving a wave characteristic from an electromagnetic wave;

means for modifying said wave characteristic based upon a predetermined value;

means for providing said modified wave characteristic to at least one amplifier also regulated by said modified wave characteristic so as to produce an output, wherein said predetermined value is derived through a desired output of said at least one amplifier,

wherein said predetermined value is implemented via a signal modifier, and wherein said signal modifier comprises a Look Up Table.

6. An apparatus for providing linearity in a non-linear system, wherein said non linear system comprises at least two current sources, comprising:

means for determining any potential non linear output of said at least two current sources;

means for modifying said non linear output via a signal modifier;

wherein said modification provides a linearity to said potential non linear output of said current sources, and

wherein said signal modifier comprises a Look Up Table.

7. A signal modifier for use in a signal processing system comprising current source potential weighted values and input state values, wherein said input state values further comprise input state values to at least two current sources, and wherein said signal modifier comprises a Look Up Table.

8. A method for generating a current comprising:

providing an electromagnetic wave;

deriving an amplitude characteristic from said electromagnetic wave;

altering said amplitude characteristic based upon a determination of error to produce an altered amplitude wave characteristic; and

applying said altered amplitude wave characteristic to at least one current source to generate an output current, wherein said alteration of said amplitude wave characteristic is achieved using a Look Up Table.

9. An apparatus for correcting an electromagnetic input signal which is to be amplified by a digital amplifier, said apparatus comprising:

an input port for receiving at least an amplitude portion of said electromagnetic input signal;

a signal modifier for correcting said amplitude portion using a linear approximation based upon a predetermined non-linear output of said digital amplifier to create a corrected amplitude portion; and

an output port for propagating said corrected amplitude portion, wherein said apparatus further comprising a Look Up Table based upon said non-linear output of said digital amplifier to be used to correct said amplitude portion.