# US 2013/0278332 A1 · Doherty amplifying apparatus and method

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- Number: US 2013/0278332 A1
- Document ID: US20130278332A1
- Status: Published application
- Kind: A1
- Application number: 13/793,164
- Filed: 2013-03-11
- Published: 2013-10-24
- Earliest claimed: 2012-04-23
- Assignees: Electronics and Telecommunications Research Institute
- Inventors: Hong Gu JI; In Bok YOM
- Web page: https://patentgrep.com/patent/US20130278332A1

## CPC

- H03F 1/3241: {using predistortion circuits (H03F1/3211, H03F1/3217 take precedence)}
- H03F 1/0288: {using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers}
- H03F 1/3276: {using the nonlinearity inherent to components, e.g. a diode}
- H03F: AMPLIFIERS

## Abstract

Disclosed is a Doherty amplifying apparatus and method that ensures efficiency in linearity of an input signal by linearizing an applied signal using a linearization unit by analog pre-distortion, and amplifying the linearized signal using a primary amplifier and a secondary amplifier.

## Claims

### Claim 1

A Doherty amplifying apparatus, comprising:
a linearization unit to linearize an applied signal through an analog pre-distortion;
a primary amplifier to amplify the linearized signal; and
a secondary amplifier to amplify the linearized signal.

### Claim 2 (depends on 1)

The Doherty amplifying apparatus of claim 1, wherein the primary amplifier and the auxiliary amplifier amplify the linearized signal based on differing operation points.

### Claim 3 (depends on 1)

The Doherty amplifying apparatus of claim 1, wherein the linearization unit is combined to a front portion of the primary amplifier.

### Claim 4 (depends on 1)

The Doherty amplifying apparatus of claim 1, wherein the linearization unit is combined to a front portion of the secondary amplifier.

### Claim 5 (depends on 1)

The Doherty amplifying apparatus of claim 1, wherein the linearization unit is combined to a front portion of the primary amplifier and the auxiliary amplifier.

### Claim 6 (depends on 1)

The Doherty amplifying apparatus of claim 1, wherein the linearization unit detects an inter-modulation distortion (IMD) component of the applied signal.

### Claim 7 (depends on 6)

The Doherty amplifying apparatus of claim 6, wherein the linearization unit performs inverse phasing with respect to a signal from which the IMD component is detected and applies the inverse-phased signal to the primary amplifier or the secondary amplifier.

### Claim 8

A Doherty amplifying method, comprising:
linearizing an applied signal using a linearization unit through an analog pre-distortion;
amplifying the linearized signal using a primary amplifier; and
amplifying the linearized signal using a secondary amplifier.

### Claim 9 (depends on 8)

The Doherty amplifying method of claim 8, wherein the primary amplifier and the secondary amplifier amplify the linearized signal based on differing operation points.

### Claim 10 (depends on 8)

The Doherty amplifying method of claim 8, wherein the linearization unit is combined to a front portion of the primary amplifier.

### Claim 11 (depends on 8)

The Doherty amplifying method of claim 8, wherein the linearization unit is combined to a front portion of the secondary amplifier.

### Claim 12 (depends on 8)

The Doherty amplifying method of claim 8, wherein the linearization unit is combined to a front portion of the primary amplifier and the secondary amplifier.

### Claim 13 (depends on 8)

The Doherty amplifying method of claim 8, wherein the linearization comprises:
detecting an inter-modulation distortion (IMD) component of the applied signal.

### Claim 14 (depends on 13)

The Doherty amplifying method of claim 13, wherein the linearizing further comprises:
performing inverse phasing with respect to the signal from which the IMD component is detected and applying the inverse-phased signal to the primary amplifier or the secondary amplifier.