System and method for linearizing nonlinear power amplifiers

• US 20060264190A1
• Filed: 05/23/2005
• Published: 11/23/2006
• Est. Priority Date: 05/23/2005
• Status: Abandoned Application

• Current Assignee: Boris Aleiner
• Original Assignee: Boris Aleiner
• Inventors: Aleiner, Boris
• Application Number:
  US11/136,015
• Publication Number:
  US 20060264190A1
• Time in Patent Office: Days
• US Class Current: 455/127.100
• CPC Class Codes: H03F 1/02 Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• CPC Class Codes: H03F 1/0205 in transistor amplifiers
• CPC Class Codes: H03F 1/32 Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34
• CPC Class Codes: H03F 1/3223 using feed-forward H03F1/3211 takes precedence
• CPC Class Codes: H03F 1/3229 using a loop for error extraction and another loop for error subtraction
• CPC Class Codes: H03F 2200/204 A hybrid coupler being used at the output of an amplifier circuit
• CPC Class Codes: H03F 2201/3215 To increase the output power or efficiency
• CPC Class Codes: H03F 3/211 using a combination of several amplifiers H03F3/60 takes precedence
• CPC Class Codes: H03F 3/24 of transmitter output stages
• CPC Class Codes: H04B 1/04 Circuits
• CPC Class Codes: H04B 2001/0441 with linearisation using feed-forward

Abstract

An apparatus linearizing and technique for linearizing a nonlinear power amplifier used in transmitters of systems for digital wireless communications. Linearization of the nonlinear amplifier is achieved by adding additional signals generated from a specification-given input data stream to the output of the nonlinear power amplifier. The invention allows use of nonlinear power amplifier, which typically enjoys a lower current consumption than that of a linear power amplifier, thus increasing the time between batteries recharges (for user transmitter equipment) and/or reducing the overall size, electric bill expenses, and cooling requirements (for network transmitter equipment). Input data, generated by a given digital wireless standard, is raised to a mathematical power by a required number and converted to RF of a transmitted signal frequency. Then all obtained RF waveforms are added with the same amplitude and the opposite phase to the spectrum of sidelobes generated by nonlinearity of a power amplifier.

Claims

1. A transmitter of a wireless device, comprising:

a power amplifier;

a set of functions capable of producing special operations on incoming data stream signal, said set of functions including mathematical function of raising the initial value of a signal to an Odd Power;

a set of modems converting said results to RF waveforms; and

a set of devices to add said RF waveforms to the output of said power amplifier.

2. The transmitter of a wireless device according to claim 1, wherein said power amplifier is any type of a nonlinear amplifier.

3. The transmitter of a wireless device according to claim 1, wherein said device is operating in any type of digital wireless environment.

4. The transmitter of a wireless device according to claim 1, wherein said wireless modulated signal is operated upon by said set of mathematical functions before entering said power amplifier.

5. A method of improving efficiency of a power amplifier in a transmitter, comprising the Steps of raising the initial value of an incoming data stream to an odd mathematical power.

6. The method of claim 5, further comprising the Step of reducing spectrum re-growth in digital wireless systems by using set of mathematical functions.

7. The method of claim 5, wherein said power amplifier is a nonlinear amplifier.

8. An apparatus for improving efficiency of a power amplifier in a transmitter, the apparatus comprising:

means for creating a set of functions capable of raising the initial value of an incoming data stream to odd mathematical powers; and

means for canceling error in an incoming data stream.

9. The apparatus of claim 8, further comprising means for reducing spectrum re-growth in digital wireless systems.

10. The apparatus of claim 8, wherein said power amplifier is a nonlinear amplifier.