Power amplifier with advanced linearity

• US 8,872,583 B2
• Filed: 02/29/2012
• Issued: 10/28/2014
• Est. Priority Date: 04/12/2011
• Status: Active Grant

• Current Assignee: soongsil university-industry cooperation foundation
• Original Assignee: Electronics and Telecommunications Research Institute, Foundation of Soongsil University-Industry Cooperation
• Inventors: Lee, Chong Min, Seo, Chul Hun
• Primary Examiner(s): Nguyen, Khanh V
• Application Number:
  US13/407,892
• Publication Number:
  US 20120262234A1
• Time in Patent Office: 972 Days
• Field of Search: 330/124.R, 330/149, 330/295, 330/302
• US Class Current: 330/149
• CPC Class Codes: H03F 1/3241 using predistortion circuits H03F1/3211, H03F1/3217 take precedence
• CPC Class Codes: H03F 1/565 using inductive elements
• CPC Class Codes: H03F 2200/318 A matching circuit being used as coupling element between two amplifying stages
• CPC Class Codes: H03F 3/602 Combinations of several amplifiers

Abstract

An amplifier is provided. The amplifier includes an input matching unit suppressing harmonic components of an input signal; a high power amplification unit amplifying a signal suppressed by the input matching unit; and an output matching unit suppressing harmonic components of an output signal amplified by the high power amplification unit.

Claims

1. An amplifier, comprising:

a predistortion unit suppressing intermodulation distortion; and

a power amplification unit amplifying power of an amplification target signal passing through the predistortion unit,

wherein the power amplification unit has a parallel amplifier structure in which a first amplification unit and a second amplification unit are coupled with each other in parallel,

the first amplification unit and the second amplification unit each include;

an input matching unit suppressing harmonic components of the amplification target signal;

a high power amplification unit amplifying a signal suppressed by the input matching unit; and

an output matching unit suppressing the harmonic components of an output signal amplified by the high power amplification unit,

wherein the predistortion unit includes a phase shifter that shifts a phase of third intermodulation distortion component of a signal input to the predistortion unit by 180°

.

2. The amplifier of claim 1, wherein the input matching unit and the output matching unit have frequency characteristics of a notch filter.

3. The amplifier of claim 2, wherein the input matching unit and the output matching unit have a meta electromagnetic wave structure.

4. The amplifier of claim 3, wherein the input matching unit and the output matching unit have a composite right/left handed (CRLH) structure.

5. The amplifier of claim 3, wherein the input matching unit and the output matching unit have a two-stage CRLH structure.

6. An amplifier, comprising:

a driving amplification unit comprising a driving power amplifier and matching units provided at the input end and the output end of the driving amplifier;

a predistortion unit shifting the phase of a third intermodulation distortion signal of an output signal passing through the driving amplification unit; and

an output amplification unit comprising a power amplification unit amplifying power of an amplification target signal passing through the predistortion unit,

wherein the power amplification unit has a parallel amplifier structure in which a first amplification unit and a second amplification unit are coupled with each other in parallel,

the first amplification unit and the second amplification unit each include;

an input matching unit suppressing harmonic components of the amplification target signal;

a high power amplification unit amplifying a signal suppressed by the input matching unit; and

an output matching unit suppressing the harmonic components of an output signal amplified by the high power amplification unit.

7. The amplifier of claim 6, wherein the predistortion unit and the output amplification unit are coupled with each other through a 3-arm coupler.

8. The amplifier of claim 6, wherein two output ends of the output amplification unit are coupled with each other through a 3-arm coupler.

9. The amplifier of claim 6, wherein the predistortion unit includes a phase shifter that shifts a phase of third intermodulation distortion component of a signal input to the predistortion unit by 180°

.

10. The amplifier of claim 6, wherein the input matching unit and the output matching unit have frequency characteristics of a notch filter.

11. The amplifier of claim 10, wherein the input matching unit and the output matching unit have a meta electromagnetic wave structure.

12. The amplifier of claim 10, wherein the input matching unit and the output matching unit have a composite right/left handed (CRLH) structure.

13. The amplifier of claim 12, wherein the input matching unit and the output matching unit have a two-stage CRLH structure.