Balanced Doherty power amplifier circuit and radio transmitter

Patent metadata

Field	Value
Publication number	US-9608573-B2
Application number	US-201615047888-A
Country	US
Kind code	B2
Filing date	Feb 19, 2016
Priority date	Aug 21, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A balanced Doherty power amplifier circuit and a radio transmitter is provided. The circuit includes a first peak amplifier, where an input end of the first peak amplifier is connected to a first input end of the circuit, and a first mean amplifier, where an input end of the first mean amplifier is connected to a second input end of the circuit, and an output end of the first mean amplifier is connected to an input end of a first matching unit. The circuit also includes a second peak amplifier, where an input end of the second peak amplifier is connected to the first input end of the circuit; and a second mean amplifier, where an input end of the second mean amplifier is connected to the second input end of the circuit, and an output end of the second mean amplifier is connected to an input end of the second matching unit.

First claim

What is claimed is:

1. A balanced Doherty power amplifier circuit, comprising:
a first peak amplifier, wherein an input end of the first peak amplifier is connected to a first input end of the balanced Doherty power amplifier circuit;
a first matching unit, wherein an input end of the first matching unit is connected to an output end of the first peak amplifier, and an output end of the first matching unit is connected to an output end of the balanced Doherty power amplifier circuit;
a first main amplifier, wherein an input end of the first main amplifier is connected to a second input end of the balanced Doherty power amplifier circuit, and an output end of the first main amplifier is connected to the input end of the first matching unit by a one-fourth wavelength line;
a second peak amplifier, wherein an input end of the second peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit;
a second matching unit, wherein an input end of the second matching unit is connected to an output end of the second peak amplifier, and an output end of the second matching unit is connected to the output end of the balanced Doherty power amplifier circuit; and
a second main amplifier, wherein an input end of the second main amplifier is connected to the second input end of the balanced Doherty power amplifier circuit, and an output end of the second main amplifier is connected to the input end of the second matching unit by a one-fourth wavelength line.

2. The balanced Doherty power amplifier circuit according to claim 1 , wherein:
the input end of the first peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line; and
the input end of the second peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line.

3. A radio transmitter, comprising:
a processor; and
a balanced Doherty power amplifier circuit;
wherein the processor is connected to a first input end and a second input end of the balanced Doherty power amplifier circuit, and is configured to provide an input signal that matches the balanced Doherty power amplifier circuit; and
wherein the balanced Doherty power amplifier circuit comprises:
a first peak amplifier, wherein an input end of the first peak amplifier is connected to a first input end of the balanced Doherty power amplifier circuit;
a first matching unit, wherein an input end of the first matching unit is connected to an output end of the first peak amplifier, and an output end of the first matching unit is connected to an output end of the balanced Doherty power amplifier circuit;
a first main amplifier, wherein an input end of the first main amplifier is connected to a second input end of the balanced Doherty power amplifier circuit, and an output end of the first main amplifier is connected to the input end of the first matching unit by a one-fourth wavelength line;
a second peak amplifier, wherein an input end of the second peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit;
a second matching unit, wherein an input end of the second matching unit is connected to an output end of the second peak amplifier, and an output end of the second matching unit is connected to the output end of the balanced Doherty power amplifier circuit; and
a second main amplifier, wherein an input end of the second mean amplifier is connected to the second input end of the balanced Doherty power amplifier circuit, and an output end of the second main amplifier is connected to the input end of the second matching unit by a one-fourth wavelength line.

4. The radio transmitter according to claim 3 , wherein:
the input end of the first peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line; and
the input end of the second peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line.

5. A method of forming a balanced Doherty power amplifier circuit, comprising:
connecting an input end of a first peak amplifier to a first input end of the balanced Doherty power amplifier circuit;
connecting an input end of a first matching unit to an output end of the first peak amplifier, and connecting an output end of the first matching unit to an output end of the balanced Doherty power amplifier circuit;
connecting an input end of a first main amplifier to a second input end of the balanced Doherty power amplifier circuit, and connecting an output end of the first main amplifier to the input end of the first matching unit by a one-fourth wavelength line;
connecting an input end of a second peak amplifier to the first input end of the balanced Doherty power amplifier circuit;
connecting an input end of a second matching unit to an output end of the second peak amplifier, and connecting an output end of the second matching unit to the output end of the balanced Doherty power amplifier circuit; and
connecting an input end of a second main amplifier to the second input end of the balanced Doherty power amplifier circuit, and connecting an output end of the second main amplifier to the input end of the second matching unit by a one-fourth wavelength line.

6. The method according to claim 5 , wherein:
the input end of the first peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line; and
the input end of the second peak amplifier is connected to the first input end of the balanced Doherty power amplifier circuit by a one-fourth wavelength line.

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Kun
• Su Yongge
• Wang Laiqing

Classifications

• H03F2200/321

  Use of a microprocessor in an amplifier circuit or its control circuit · CPC title

• H03F3/68

  Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics {(power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602)} · CPC title

• H03F1/07

  Doherty-type amplifiers · CPC title

• H03F1/0288 Primary

  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 · CPC title

• H03F2200/387

  A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier · CPC title